This is exactly what I was looking for. I'm not in 8th grade, but I am preparing for a masters degree. (I wish I would have known in high school that I would need this later) :D
grade 10 and struggling with arithmetic geometric sequences because of lots of GCD and shenanigans. THANK YOU SO MUCH this helped clear what I was missing!!!!
Hello, I'm an 8th grader whom just spent about 2 and a half hours fatorizing the number 225.then I finally got tired and looked on TH-cam to see if anything could help me. And this video did just that. Thank u so much u helped me a lot. God bless you ❤️🎉💕
That’s fabulous! I’m so pleased. My second vid on this has an example which has repeating primes. I think that might actually be a bit better - I was getting stronger with the method and the thinking. Doesn’t ‘guess and check’ just suck the life out of you? I loathe that approach and I love this one for its speed and clarity. 😃🤗🤩💕
@@LetsDoMath yah, I rly don't like the guess and check method. It takes too long. (and it is very irritating if I must say) but this is an organized method and I rly enjoy doing it. Thax again so much.
hi!! advanced grade 6 level student here, this is literally the BEST method i know. Thank you so much!! gotta do homework now i am 2 days behind schedule and my class is tomorrow!!
Cool! I was delighted when I first thought of it and tried it out! That whole thing of taking anew line each time was just my way of keeping straight what I’d actually done first time.I was kind of surprised when it suddenly all came together! I’m glad you like it too, and thanks for your note. 🤗😃😎💕
Great stuff. The second one, with repeated prime factors is a bit stronger I think. Probably because I’d done a lot more practice with this strategy and was much more comfortable with it. In this first video, I’d only just come up with the method. Pretty exciting stuff though, to be able to suddenly get all those pesky factors, where previously, no matter how hard I tried, I’d miss at least a couple of factors. Now, that’s a thing of the past.
After going through your video and working out the factors for 210, I tried working out a random number, 432. I'm confused with how this method works with a number such as 432. After prime factorizing I'm left with 2 to the power of 4 and 3 to the power of 3 and I'm not sure how that works to show me all the factors of 432. How would you work out 432?
I made a second vid on this method covering a number that gave repeated primes. That will help you. It’s in my playlist Factors, Prime Factors. If you go through my website letsdomath.ca it’s even easier to locate.
Wow! I'm from the Philippines and competing in math Olympiads! I need to find all factors so I can know which has 4 factors. They were large numbers but thanks for this method! 🎉
I swear. I am at "to simplify radical expressions" already and I was given numbers like 180,360 etc and I seriously cant do it. I really loved this video so much Thank you ma'am!!!!!
Thank you very much! I think the next one, with the repeating primes is possibly a bit better. It also has some music I thought was kind of fun for the part where you collect all the primes. I think maybe I had a better handle on the process on the next one. It might be a bit clearer. On this first one I was so excited I'd worked a way of doing it on paper I had to get a vid out immediately. With your 180,360... are you using repeated division using prime divisors? That's a stinky one, by the way; I just did it. Do you know the rule of divisibility for 3? I have a vid on it. Here's the link: th-cam.com/video/xdunx3IbkeI/w-d-xo.html I got down to 167. It looked fishy so I googled it: it's prime. Like I said, that's stinky. If you didn't already know the rule of divisibility for 3, this is really going to help you on your prime factorization problems. 😉🤗😎💕
How do you know if you have correctly multiplied all of the conceivable combinations of prime numbers together? That part is the only part that is confusing to me.
Hmm. I haven't come up with a 'how to check you've got them all' strategy. Just this, to make sure that you've got everything. Sorry, I don't have an answer to your question at this point except to ask for care and attention as you're going at it. Wish I had a definitive answer for you.
I ma in grade 5 and I was struggling on this kind of question.I am preparing for IMO SOF. IMO is impossible to do. This video helped me a lot. BEST VIDEO EVER
Isn't is crazy that some people charge to teach this But.. the students are saved by these kind of generous u tubers making vids that really hepls us! Thanx❤
Sorry Grace. It IS a bit fiddly, but if you can stick with it, it does work. If you're doing smaller numbers, you can just go with one of the other methods in the playlist Factors, Prime Factors.
Maybe take a look at the second vid where there are repeating primes. That might help you to see a second example. It IS quite a headache to get your head around. Tbh most of the examples you’ll get I would expect to be 2-digit numbers, and values for which you can immediately find 2 factor pairs. Like 54 is from 6x9. Find the primes of 6 (2 and 3) and the primes of 9 (3x3). Now it’s easy enough to get all your combos I think.
Thank you so so much for this, it helped me a lot! And Instead of being on my phone or any type of device all the time, i think i shouldve just studied. You made math even more easy for me, thank you so much!
They make phones enticing and engaging, probably too much so. It takes some willpower to put it face down, turn it off and do something more productive instead. Good for you, coming back to the math with solid purpose! If you put in regular practice at solving problems, you'll really see the benefit quickly - in terms of how quickly you think through a problem, and the success you have at solving those problems. Practice really is the key. And it's a pleasure to help, of course! 🤗😉😃
Glad you asked that. There’s a second video showing exactly this scenario. 😃 Have you been on my website? It’s so easy to spot it there. Go to the Resources page (click that link on the signpost), scroll down to the section on prime factorization, and you’ll see it at the end of the list there. 🤗
Let's Do Math It is very much the same idea. But the way its done makes it easier for like the factors ending up like: 2x5x11 where it is 11 to the power of 2
Your videos are really nice 👍 . I found this video when I was in trouble in finding factors of a factors fast 💨, and as a coincidence my hard number was also 210 😊😊🙏🙏😯😯
Glad you like it.,I was really happy when I worked it out. These kind of questions have always left me missing a couple of factors out. Not any more! 😉😎💕
Take a look at the second one too, with repeating primes as part of the decomposition. Tbh, I don’t know that we need this very often. I came up with this method in answer to the really horrible times when I’ve seen a class be told to find all the factors using ‘guess and check’. That approach is disheartening for me, never mind seeing kids’ confidence get crushed that way! We want to enable kids as mathematicians, not leave them feeling unable to do it, or even find a way n to start beyond crappy guess n check!
Perfect! I’m always happy to help. My videos are sorted into playlists so you can quickly find what you need. There are more playlists than you can see on one screen, so you have to use the arrow to move to the right and see more. 🤗😃😎💕
Fabulous! I’m really glad it helps him. I’m not sure if the second video I made on this is simpler to understand; you can be the judge on that. But that one covers a number that features repeating primes, and I think that’s a useful thing to see too. 😃😎💕
I’ve NEVER had it explained to me at all! It’s always seemed like some kind of arcane magic that I just couldn’t get. Then when I thought about it through prime numbers, I came up with this way of combining them, and it really works! The second vid, which has repeated primes as part of the prime factorization is maybe a bit easier to understand. Plus it’s got a fun little music break during the phase of pulling out the different factorization. Anyway... I’m really pleased this helps you too! 😉😃🤗😎🤩
Thanks very much! I think they will really find the next one helpful too. That has an example with repeating primes. It’s also in the playlist Factors, Prime Factors. 😃😎🤩
Thanks very much, I’m glad it helps. If you use my website letsdomath.ca you’ll easily find lots of stuff to help. It’s all set out in topic groups and leads you through each area I’ve covered. There is a second vid I made using this method for finding all the factors, and I think it’s really helpful because it uses repeating primes, and in that vid I use both dividing by a prime to reduce the number, and factor tree. You can do that - mix and match methods for ease and speed. I should say that often, Factorizing questions have smaller numbers, and often you can do them just with your tables knowledge and not need this method. I made these videos because I was upset by something I saw in class one day. As a supporting supply teacher, I observed students given values to factorize that were too big for them and they were told to use ‘guess and check’ to find every factor. Those poor kids struggled and felt so discouraged by the end using this miserable time-wasting ‘strategy’. So I thought up a way to solve anything a teacher might reasonably throw at you. I hate wasting time in math class, there’s a lot to get through and confidence is built by feeling success, not by being discouraged because we haven’t got the tools to solve a problem. Now you have the tools! 😃🤗🥰
That was a 'D'Oh!' moment then. I've had them too, don't worry. Look at it as a practice run. Seriously, I'm very glad this helped you. Every time I do this I can't get over how cool it is! I've seen students be given 'guess and check' and faff about with that for a whole lesson period on just 2 numbers, getting increasingly frustrated as they go along. If they stick with that approach, they will forever think it's some crazy magic thing they can never get. This way, we have a tool to use and we can get to work and get the job done!
@@LetsDoMath By the way, could you please tell me what to do when a number has more than 4 Prime Factors like 2592 which has the prime factors 2*2*2*2*2*3*3*3*3?
Great stuff. Did you see the second vid on this as well? That uses a value that decomposes to repeating primes (2s and 3s). I nailed it on that vid! 😃🤩🤗😎😉
It's really cool to find all factors of any number but what if the prime factorization gives us factors of more than 4 digits how do we will make pairs of factor to get final answer ?? I hope you will answer my comment so I could be clear until exams
Got bored during quarantine and felt like doing random math , but extremely amplified for fun. Long story short I ended up needed all the factors of this one number that is in the quintillions. I tried my tried and true guess and check method and after not even Making it remotely close to getting all of them that way, I tried using online calculators to cheat and give me the answer. Problem was that the numbers I was using were too much for any of the online calculators to do. I'm hoping this method works at getting them all. 🤓
Well if you ended up creating a number that has hideous primes, it's not going to work, cos you're not going to spot them. If worst comes to worst, you can always go techy on it and use a prime factorization calculator...
For 11+, make sure you are strong in multiplication, and ho through all the fractions stuff you have covered so far. Review and sort out any issues with practice and vids on www.letsdomath.ca I hope you breeze through it with ease and confidence, to a stellar result at the end. 🤩🤗👍😃
When we have an even number, my 'go to' method is to divide b 2. But with 210, I could also have started with 5. You ask how we choose a divisor if we have an odd number. That's when your knowledge of the rules of divisibility comes into play. I have videos on that here on Let's Do Math, or you can use this link: www.letsdomath.ca/contents and scroll down to the section on Rules of Divisibility. The rule for divisibility by 3 is the one you MUST know: if you add up all the digits in your number, and they come to a value in the 3x table, then 3 is a factor!
Hi there. Just my personal preference, really. Any time I have an even number I just always start with 2. Of course you could also start with 5. Order doesn't matter as long as you pick all those primes up - just whatever seems easiest is fine.
This video is awesome, but I have a question! Do I have to check every time if two numbers have to same product as the 3 prime number product for the combinations part? thank you so much!
Did you look at the second one, where there are repeating primes? I think seeing it a second time with different numbers will help. Basically it’s just combining all the primes in every possible combination. And to be honest, I doubt this will come up much. In a test or exam it’s likely much smaller numbers. I came up with this method because that whole ‘guess-and-check’ method wasn’t cutting it. And seeing students struggle and just give up doesn’t work for me. We need a system to ensure we catch them all. Then it takes on an aspect of fun because you can actually do it. When you’re in guess-and-check, it’s such a frustrating state, in my view.
I actually hated those questions in school - it’s a way to take the whole math period with awful guess-and-check, leaving a person feeling not even close to being good enough. But that’s a load of rubbish, because it’s just that we hadn’t been taught a way to find them all. Once you know this, those questions take their proper place… something you can deal with and move on. Then you can go off to do something more interesting instead. Guess and check is horrible - it means we need a solid strategy and we don’t yet have it. If your teacher tells you to use ‘guess-and-check’, I recommend bugging your teacher for a working strategy that lets you move it. 😉😃🥰
1. i love your pencil pfp!! 2. What is the main problem with finding out the factors of 161? just do the process but divide it with another factor that isn't 2 (since 161 can't be divided by 2)
Different curriculums based on locations and also how good your school is (government or private) For example private schools in Australia or India can teach this in
Ohh my god broo these Americans learn about prime factorisation in grade 8 😂 but in India they teach us in grade 3 and 4 above that 210 is big number got me 😂
is there a quicker way to find out the factors of 551 without repeatedly pressing the calculator? my lecturer seems to like to find these kind of numbers where u cant divide them out as shown in your method...
So your lecturer is trying you hard. As life’s too short for trying out various tough primes as factors… I cheat! Here’s my cheat: in your search line put in Factor Finder. Pick one, put in your value. That’s what I did and discovered its factors are 1, 19, 29, 551. Since this is about using the thinking, I don’t get why you’d use primes like this to create your number. Without an online sensible search (aka my ‘cheat’) you’ll be at this all day. Sorry that was the problem you were given. So here’s what my next move would be, in your shoes. I would create a similar number, say 23x41, so the number is 943 I’d tell my lecturer that I didn’t get how to approach this when you have a bigger number with no obvious ‘way in’, as in the numbers I create for students, and worked on in my vid. I’d show them the number and ask for a demo of the thinking so I can improve and do this too. BUT I will also put a caveat in that. I don’t know your teacher. Being able to swing this kind of interaction relies on delicate handling, and you have to be able to really ‘read’ your prof, know how far you can push it, because some people might get angry at this scenario, seeing it as cheeky, or a challenge. For me, I want to learn, as I’m sure you do too. If a prof gives a problem like this just as a ‘busy work’ tactic, I have no time for it. I devised this method so we can get away from that hideous guess and check, and now with this problem we’re right back at it. If you get more info and further help from your prof, I’m keen to share in that learning too. Best of luck. 🤞😃🤗
You’re looking for the obvious primes by which you can divide. 190 is even so you can divide by 2, and as it ends in 0, clearly 5 is a factor (and 2x5 = 10 and that’s a factor of 190). Equally as 190 is pretty straightforward you could do a tree diagram to break it down and show it as 10 x 19. 10 is from 2x5 so the primes are 2, 5, 19. Multiple ways in, it just depends on the question asked and how you want to approach it.
That’s great! Glad to help. You might find the second vid on this very helpful too. That one uses repeating primes: 3x3x3x3 and 2x2 if I remember my values right. It has a fun little bit during the collect all the factors step... Its also in my playlist Factors, Prime Factors. 😃🤗🤩
Hi there. So I started with 2 because it's even (it's just my standard way of working). If a number ends in zero, I could also start with 5, because 5 is also clearly a factor.
If it's odd... well, hopefully your teacher curates numbers carefully for you, like I would. So if a number is odd, you should check to see if 3 is a factor. Use the rule of divisibility for 3 to check this out. I have a vid on this if you don't already know the rule. :o)
I wouldn't use this with grade 5. Unless this person's a mega-brain, I'd use something much more accessible, like the one where we list them all line by line. In my playlist Factors, Prime Factors, it's the second method, 'Find all the Factors, Next Step'.
For 108, you know that’s from 12x9, don’t you? Do you get that right off the bat. It’s even, so you know 2 is a factor. Divide 108 by 2 and get 54. Divide by 2 again and get 27. 2 crops up twice so 4 is a factor. Divide 108 by 4 and get 27 (already found that one, but you can see now you’ve confirmed 4. Think about 3… is it a factor? Well 3 is a factor if 9 and 12… yes it’s a factor. 108 divided by 3 = 36 Thinking in terms of those rainbows we use when we start factoring… 1 x108 on extreme outer edges Then 2x 54 Then 3x36 Then 4x27 2 and 3 are factors, so 6 is too. 108 divided by 6 = 18 Then 6x18 And in the middle spot, 9x12 You do get 12 factors. Did you forget 1x108?
This is exactly what I was looking for. I'm not in 8th grade, but I am preparing for a masters degree. (I wish I would have known in high school that I would need this later) :D
Glad to help. Please also take a look at the second vid on this, with repeating primes. I think that one will seal the deal for you.
Same
Same here bro I am giving my entrance test and I don't even know the basics😭
I'm guessing GRE?
@@LetsDoMath 1:31 why are we dividing by 5 here and not 3?
grade 10 and struggling with arithmetic geometric sequences because of lots of GCD and shenanigans. THANK YOU SO MUCH this helped clear what I was missing!!!!
Glad to help. 😃🤗
Hello, I'm an 8th grader whom just spent about 2 and a half hours fatorizing the number 225.then I finally got tired and looked on TH-cam to see if anything could help me. And this video did just that. Thank u so much u helped me a lot. God bless you ❤️🎉💕
That’s fabulous! I’m so pleased. My second vid on this has an example which has repeating primes. I think that might actually be a bit better - I was getting stronger with the method and the thinking.
Doesn’t ‘guess and check’ just suck the life out of you? I loathe that approach and I love this one for its speed and clarity. 😃🤗🤩💕
@@LetsDoMath yah, I rly don't like the guess and check method. It takes too long. (and it is very irritating if I must say) but this is an organized method and I rly enjoy doing it. Thax again so much.
It’s truly such a delight to know that you get it and it has let you blast through that work! Just fabulous!!
Narayan Bless You 🎉🎉🎉🎉🎉😊😊😊😊😊
Hi, can you explain why this works? 😊
Omg!!! I'm JUST Grade 5 and I'm already learning this for our test!?! Thank God I saw this!!! THANK YOU SO MUCH MAY GOD BLESS YOU FOREVER!!! ❤❤❤
Nd I'm grade 6 learning this
I'm in grade 10 and I was struggling with factorizing big numbers, this helped so damn much. Thank you so much!
It is my very great pleasure!
Thanks so much for your note. 🤗😃💕😎
Zed-Kay sem here
Mee too
I already known by this method in factorisation
Daymn u now grade 12 good luck!!
hi!! advanced grade 6 level student here, this is literally the BEST method i know. Thank you so much!!
gotta do homework now i am 2 days behind schedule and my class is tomorrow!!
Cool! I was delighted when I first thought of it and tried it out! That whole thing of taking anew line each time was just my way of keeping straight what I’d actually done first time.I was kind of surprised when it suddenly all came together! I’m glad you like it too, and thanks for your note. 🤗😃😎💕
The prime factorization video combined with this one were very helpful to quick, systematic factorization.
Great stuff. The second one, with repeated prime factors is a bit stronger I think. Probably because I’d done a lot more practice with this strategy and was much more comfortable with it. In this first video, I’d only just come up with the method. Pretty exciting stuff though, to be able to suddenly get all those pesky factors, where previously, no matter how hard I tried, I’d miss at least a couple of factors. Now, that’s a thing of the past.
Thank you! I posted this on my google classroom for students who missed class today.
Hi Shannon, that’s great! Thanks for sharing. 😃😎🤗
Thats a students worst fear, you devil.
@@blebby7034 LMAO 🤣 😂 😆
@@mariamawad8042 :D
@@blebby7034 LOL
After going through your video and working out the factors for 210, I tried working out a random number, 432. I'm confused with how this method works with a number such as 432. After prime factorizing I'm left with 2 to the power of 4 and 3 to the power of 3 and I'm not sure how that works to show me all the factors of 432. How would you work out 432?
I made a second vid on this method covering a number that gave repeated primes. That will help you. It’s in my playlist Factors, Prime Factors.
If you go through my website letsdomath.ca it’s even easier to locate.
@@LetsDoMath Thank you so much! I’ll check that video out now.
I am in class 11 th but i am struggling in that 😂😂 thanks for the video😊😊
Wow! I'm from the Philippines and competing in math Olympiads! I need to find all factors so I can know which has 4 factors. They were large numbers but thanks for this method! 🎉
I'm in grade 5 ICSE board and I got numbers in thousands to find factor of . Just the video I was looking for THANK YOU SOOOOOOOO MUCH❤❤
I swear.
I am at "to simplify radical expressions" already and I was given numbers like 180,360 etc and I seriously cant do it.
I really loved this video so much Thank you ma'am!!!!!
Thank you very much! I think the next one, with the repeating primes is possibly a bit better. It also has some music I thought was kind of fun for the part where you collect all the primes. I think maybe I had a better handle on the process on the next one. It might be a bit clearer. On this first one I was so excited I'd worked a way of doing it on paper I had to get a vid out immediately.
With your 180,360... are you using repeated division using prime divisors?
That's a stinky one, by the way; I just did it.
Do you know the rule of divisibility for 3? I have a vid on it. Here's the link: th-cam.com/video/xdunx3IbkeI/w-d-xo.html
I got down to 167. It looked fishy so I googled it: it's prime. Like I said, that's stinky.
If you didn't already know the rule of divisibility for 3, this is really going to help you on your prime factorization problems. 😉🤗😎💕
@@LetsDoMath OMG THANK YOU VERY MUCH MA'AM. A SUB FOR YOUR EFFORT =)
Well thanks very much! Did that help? Hope so. 🤗😉💕
Wow, what a nice way to teach, how to knowing all the factors of any number. Thankyou so much. 🙏 ❤
the viewers who see your channel become great persons
Sweet!
How do you know if you have correctly multiplied all of the conceivable combinations of prime numbers together? That part is the only part that is confusing to me.
Hmm. I haven't come up with a 'how to check you've got them all' strategy. Just this, to make sure that you've got everything. Sorry, I don't have an answer to your question at this point except to ask for care and attention as you're going at it. Wish I had a definitive answer for you.
I ma in grade 5 and I was struggling on this kind of question.I am preparing for IMO SOF. IMO is impossible to do. This video helped me a lot. BEST VIDEO EVER
I meant I am in
Isn't is crazy that some people charge to teach this
But.. the students are saved by these kind of generous u tubers making vids that really hepls us!
Thanx❤
I understand until the combination part : that's when it got confusing
Sorry Grace. It IS a bit fiddly, but if you can stick with it, it does work. If you're doing smaller numbers, you can just go with one of the other methods in the playlist Factors, Prime Factors.
Same
Maybe take a look at the second vid where there are repeating primes. That might help you to see a second example. It IS quite a headache to get your head around.
Tbh most of the examples you’ll get I would expect to be 2-digit numbers, and values for which you can immediately find 2 factor pairs. Like 54 is from 6x9. Find the primes of 6 (2 and 3) and the primes of 9 (3x3). Now it’s easy enough to get all your combos I think.
Thank you so so much for this, it helped me a lot! And Instead of being on my phone or any type of device all the time, i think i shouldve just studied. You made math even more easy for me, thank you so much!
They make phones enticing and engaging, probably too much so. It takes some willpower to put it face down, turn it off and do something more productive instead. Good for you, coming back to the math with solid purpose! If you put in regular practice at solving problems, you'll really see the benefit quickly - in terms of how quickly you think through a problem, and the success you have at solving those problems. Practice really is the key. And it's a pleasure to help, of course! 🤗😉😃
im only in grade 8 just now but god bless you! this video has helped me more than my teacher thank you so much!!
Im in 5th grade and I'm already doing these. Thanks man
WOWZER! I would have run a mile if they'd given me this at your age! GAME ON little dude! Go for it!! I'm hoping for BIG things from you. 😃😎😉🤩💕
my exams are coming i am trying hard by watching videos of you i am understanding much better
That’s great, Lakhwinder. I’m pleased the videos are helping. 🤗😃😎😉
QUESTION: How do I do the combination part with 3 factors instead of 4?
What do you do when the prime factorization shows multiple of the same prime.
Glad you asked that. There’s a second video showing exactly this scenario. 😃
Have you been on my website? It’s so easy to spot it there. Go to the Resources page (click that link on the signpost), scroll down to the section on prime factorization, and you’ll see it at the end of the list there. 🤗
It'll be harder to just remember what to multiply with what for the combinations
Yes
You could get stuck multiplying forever if you lose count
And I thought i was the only one to know this in grade 8 but looks to me 6 years later its been discovered in a bit harder way😂
Ok now you have my interest piqued. I want to see your way to find all the factors! You got a vid on this? I gotta know if there’s an easier way.
Let's Do Math It is very much the same idea. But the way its done makes it easier for like the factors ending up like: 2x5x11 where it is 11 to the power of 2
Let's Do Math I dont have a video because no one ever understood me when showing it.
Let's Do Math ooo yea. And mine will show you if it correct.
PJ Furious will you post a video on this? If there’s something simpler or more elegant, I would love to see it.
Im in grade 6 and im preparing for grade 7, thank you alot
That is a great way! It helped me so much with my maths!🙂
I'm so glad! Thanks for letting me know. 😃🤗🤩😎
Your videos are really nice 👍 . I found this video when I was in trouble in finding factors of a factors fast 💨, and as a coincidence my hard number was also 210 😊😊🙏🙏😯😯
What a nice note! I’m glad my video helped you. It’s good todo a bunch if prime factorization problems - it makes your math muscles stronger 💪 😉😃😎💕🤗
Your videos are very helpful 😊😊. Can you upload a video on adding and subtracting integers.
OMG! Im grade 6 and im already learning this for the test and thank you very much ❤❤
Awesome channel and your accent is beautiful :)
Thank you very much!
I’m so happy to help.
😃😎☺️
Great trick, mam. Thanks a lot have a lovely day
Thanks, you too. 😃🤗😎
ths video is so nice! i got how to find all the factrs of a number
GREAT! Well done! 😃🤗🤩💕
Very nice trick I was confusing to get simplest form Nice trick it is so brilliant
Glad you like it.,I was really happy when I worked it out. These kind of questions have always left me missing a couple of factors out. Not any more! 😉😎💕
What a method! This is INCREDIBLE!!! Thank you so much
Take a look at the second one too, with repeating primes as part of the decomposition.
Tbh, I don’t know that we need this very often. I came up with this method in answer to the really horrible times when I’ve seen a class be told to find all the factors using ‘guess and check’. That approach is disheartening for me, never mind seeing kids’ confidence get crushed that way! We want to enable kids as mathematicians, not leave them feeling unable to do it, or even find a way n to start beyond crappy guess n check!
Thank you so much my all doubts are clear you are the best explainer I am wish your channel gives 500k subscribers
Thanks very much! Glad to help. I think the second video might be even more help. In that one I have an example where there are repeating primes. 😃🤗😉🤩
Awesome tricks, keep this up.
I am 6th with my term exam coming up i needed this soo damn much thank u very much u have earned a sub
And from this time I am going to see your videos when in doubt 🥰🥰🥰
Perfect! I’m always happy to help. My videos are sorted into playlists so you can quickly find what you need. There are more playlists than you can see on one screen, so you have to use the arrow to move to the right and see more. 🤗😃😎💕
Miay God Richly Bless you! That 's a great help for my grandson!
Fabulous! I’m really glad it helps him. I’m not sure if the second video I made on this is simpler to understand; you can be the judge on that. But that one covers a number that features repeating primes, and I think that’s a useful thing to see too.
😃😎💕
TYSM!!!!! This makes so much sense! I am in Pre-calc10 but couldn't understand the way they were explaining it. Thanks again! :)
I’ve NEVER had it explained to me at all! It’s always seemed like some kind of arcane magic that I just couldn’t get. Then when I thought about it through prime numbers, I came up with this way of combining them, and it really works! The second vid, which has repeated primes as part of the prime factorization is maybe a bit easier to understand. Plus it’s got a fun little music break during the phase of pulling out the different factorization. Anyway... I’m really pleased this helps you too! 😉😃🤗😎🤩
Wow Im really shocked I just found a new way to do this thank you so much from saving me from detention :))))
Great stuff! Now watch the second video on this technique to seal the deal. I nailed it in that video. 😉😃🤗😎🤩💕
@@LetsDoMath alr ill watch it rn
Love this. Time to teach to my students :)
Thanks very much! I think they will really find the next one helpful too. That has an example with repeating primes. It’s also in the playlist Factors, Prime Factors. 😃😎🤩
Tysm now I can solve all my math problems ❤️😁
Happy to help
Thank you so much I've been looking all over for this I'm terrible at math
Thanks very much, I’m glad it helps. If you use my website letsdomath.ca you’ll easily find lots of stuff to help. It’s all set out in topic groups and leads you through each area I’ve covered.
There is a second vid I made using this method for finding all the factors, and I think it’s really helpful because it uses repeating primes, and in that vid I use both dividing by a prime to reduce the number, and factor tree. You can do that - mix and match methods for ease and speed.
I should say that often, Factorizing questions have smaller numbers, and often you can do them just with your tables knowledge and not need this method.
I made these videos because I was upset by something I saw in class one day. As a supporting supply teacher, I observed students given values to factorize that were too big for them and they were told to use ‘guess and check’ to find every factor. Those poor kids struggled and felt so discouraged by the end using this miserable time-wasting ‘strategy’. So I thought up a way to solve anything a teacher might reasonably throw at you. I hate wasting time in math class, there’s a lot to get through and confidence is built by feeling success, not by being discouraged because we haven’t got the tools to solve a problem. Now you have the tools! 😃🤗🥰
Omg thank you so much it really helps me in exam ,
My pleasure! 😉🤗😎🤩
THANK YOU !!! I'm not in grade 8, but in College HAHAHAHHAHA
Thank you so much you don’t know how helpful this was 😭
I'm so glad!
Good information 👍
I just spent precious minutes trying to factor out 468 when I was supposed to be factoring 225. Nevertheless, thank you very much!
That was a 'D'Oh!' moment then. I've had them too, don't worry. Look at it as a practice run. Seriously, I'm very glad this helped you. Every time I do this I can't get over how cool it is! I've seen students be given 'guess and check' and faff about with that for a whole lesson period on just 2 numbers, getting increasingly frustrated as they go along. If they stick with that approach, they will forever think it's some crazy magic thing they can never get. This way, we have a tool to use and we can get to work and get the job done!
@@LetsDoMath Yeah your method works really well! Thank you again!
@@LetsDoMath By the way, could you please tell me what to do when a number has more than 4 Prime Factors like 2592 which has the prime factors 2*2*2*2*2*3*3*3*3?
I'm grade5 and they give us these numbers
Thanks a lot.
I just found that how to make it easier for my boy, who is in class "3".
And here I got it.
Thanks a lot mam.
Most welcome 😊
you're video is very very very helpful
It helped me a lot. Thank you ma'am..
Great stuff. Did you see the second vid on this as well? That uses a value that decomposes to repeating primes (2s and 3s).
I nailed it on that vid! 😃🤩🤗😎😉
Superb trick thanks for helping with my exam 🙏🙏🙏
Look at the one on repeating primes too. I think that’s very helpful.
THANK YOU SO MUCH!!!,ThE PEN AND PAPER METHOD WERE WERE LIKE LITERALLY,❤❤❤❤❤❤❤
Im in 5th grade but like dude we learnt prime factorisation in 4th LMAO,but this helped a lot thank you so much!
What if one of your prime factors appear more than once on your factor tree?
thank you ma'am you helped us so much.
Glad to help. 🤗😃
Thanks ma'am, you just saved my grades
Excellent! Way to go, and good for you! I helped, YOU did the work. NICE! 😃🤗🤩💕
It's really cool to find all factors of any number but what if the prime factorization gives us factors of more than 4 digits how do we will make pairs of factor to get final answer ?? I hope you will answer my comment so I could be clear until exams
Got bored during quarantine and felt like doing random math , but extremely amplified for fun. Long story short I ended up needed all the factors of this one number that is in the quintillions. I tried my tried and true guess and check method and after not even Making it remotely close to getting all of them that way, I tried using online calculators to cheat and give me the answer.
Problem was that the numbers I was using were too much for any of the online calculators to do.
I'm hoping this method works at getting them all. 🤓
Well if you ended up creating a number that has hideous primes, it's not going to work, cos you're not going to spot them. If worst comes to worst, you can always go techy on it and use a prime factorization calculator...
thank you so much you don,t know with this method i definetly save my very much of time in exam
I'm preparing for 11+ it's so useful
For 11+, make sure you are strong in multiplication, and ho through all the fractions stuff you have covered so far. Review and sort out any issues with practice and vids on www.letsdomath.ca
I hope you breeze through it with ease and confidence, to a stellar result at the end. 🤩🤗👍😃
I have a doubt in this video... You told that 210 is even so we divide with 2 but what do we divide with if the number is odd?
When we have an even number, my 'go to' method is to divide b 2. But with 210, I could also have started with 5.
You ask how we choose a divisor if we have an odd number. That's when your knowledge of the rules of divisibility comes into play. I have videos on that here on Let's Do Math, or you can use this link: www.letsdomath.ca/contents and scroll down to the section on Rules of Divisibility.
The rule for divisibility by 3 is the one you MUST know: if you add up all the digits in your number, and they come to a value in the 3x table, then 3 is a factor!
@@LetsDoMath Thank you for your speedy support!
Can we do this method to find all the factors for MTSE exam
Hello, so I was wondering why we used 2 to divide 210 and used 5 after.
Hi there. Just my personal preference, really. Any time I have an even number I just always start with 2. Of course you could also start with 5. Order doesn't matter as long as you pick all those primes up - just whatever seems easiest is fine.
@@LetsDoMath Thanks, But I was wondering why you used 5 other than any other numbers.
Ooo thx so much.it was really helpful.i was stuck in finding all the factors but now I’m super okay!!😃😃😃😍
That's fabulous! Well done! This will no longer make you waste time struggling then. Without this method, I faff around for such a long time!
This video is awesome, but I have a question! Do I have to check every time if two numbers have to same product as the 3 prime number product for the combinations part? thank you so much!
Did you look at the second one, where there are repeating primes? I think seeing it a second time with different numbers will help.
Basically it’s just combining all the primes in every possible combination.
And to be honest, I doubt this will come up much. In a test or exam it’s likely much smaller numbers. I came up with this method because that whole ‘guess-and-check’ method wasn’t cutting it. And seeing students struggle and just give up doesn’t work for me. We need a system to ensure we catch them all. Then it takes on an aspect of fun because you can actually do it. When you’re in guess-and-check, it’s such a frustrating state, in my view.
This video is very helpful thanks.
Good to know. Glad to help.
Thank you Let's Do Math i understood very clearly may god bless you :)
Thank you for helping.
My pleasure!
OMG You don't know how much time I save with this trick. And also, the way you explain the trick is (way easier than my teacher) tysm!!
I actually hated those questions in school - it’s a way to take the whole math period with awful guess-and-check, leaving a person feeling not even close to being good enough. But that’s a load of rubbish, because it’s just that we hadn’t been taught a way to find them all. Once you know this, those questions take their proper place… something you can deal with and move on. Then you can go off to do something more interesting instead. Guess and check is horrible - it means we need a solid strategy and we don’t yet have it. If your teacher tells you to use ‘guess-and-check’, I recommend bugging your teacher for a working strategy that lets you move it. 😉😃🥰
Really cool vid!! But what if there is a number like 161. Im really stuck there so can you answer me?
1. i love your pencil pfp!!
2. What is the main problem with finding out the factors of 161? just do the process but divide it with another factor that isn't 2 (since 161 can't be divided by 2)
@@marschocobars ty for the compliment and ty for the answer!!
@@gamermon3786 youre welcome!! i just had a test w HCF and stuff recently so this was also useful for me :3
congratulationssss u got a new sub
Sweeeet! 😃🤗
Thanks prepared for grade 8 and in ur ne subscriber😊
Thank you very much. Good work 👍🏻👏🏻
🤗😃🥰
why am i doing this in 6th grade??
Different curriculums based on locations and also how good your school is (government or private) For example private schools in Australia or India can teach this in
SAME
Me too
Same bro
My maths teacher told to do this as homework 😢
Hey, I need help factorizing this beast of a number:
2,216,593,220,330,143
All I know is that it is the product of 2 primes.
hi! what if there's a repetition of prime numbers? are we going to include that in the next step after dividing by prime numbers? thank you!
I made a second video on this using repeated primes. You’ll see there. 😉🤗
Ohh my god broo these Americans learn about prime factorisation in grade 8 😂 but in India they teach us in grade 3 and 4 above that 210 is big number got me 😂
Thanks. It helped me so much. 😊
👍 Great stuff! 😃
Thanks.it helped me alot
Great stuff! Glad to help.
is there a quicker way to find out the factors of 551 without repeatedly pressing the calculator? my lecturer seems to like to find these kind of numbers where u cant divide them out as shown in your method...
So your lecturer is trying you hard. As life’s too short for trying out various tough primes as factors… I cheat! Here’s my cheat: in your search line put in Factor Finder. Pick one, put in your value. That’s what I did and discovered its factors are 1, 19, 29, 551.
Since this is about using the thinking, I don’t get why you’d use primes like this to create your number. Without an online sensible search (aka my ‘cheat’) you’ll be at this all day. Sorry that was the problem you were given.
So here’s what my next move would be, in your shoes.
I would create a similar number, say 23x41, so the number is 943
I’d tell my lecturer that I didn’t get how to approach this when you have a bigger number with no obvious ‘way in’, as in the numbers I create for students, and worked on in my vid. I’d show them the number and ask for a demo of the thinking so I can improve and do this too.
BUT I will also put a caveat in that. I don’t know your teacher. Being able to swing this kind of interaction relies on delicate handling, and you have to be able to really ‘read’ your prof, know how far you can push it, because some people might get angry at this scenario, seeing it as cheeky, or a challenge. For me, I want to learn, as I’m sure you do too. If a prof gives a problem like this just as a ‘busy work’ tactic, I have no time for it. I devised this method so we can get away from that hideous guess and check, and now with this problem we’re right back at it.
If you get more info and further help from your prof, I’m keen to share in that learning too.
Best of luck. 🤞😃🤗
Wait but why does it have to be divided by 2 and 5? What is it’s another number like 190. Do I still divide it by 2 and 5? (I really need an answer)
You’re looking for the obvious primes by which you can divide. 190 is even so you can divide by 2, and as it ends in 0, clearly 5 is a factor (and 2x5 = 10 and that’s a factor of 190).
Equally as 190 is pretty straightforward you could do a tree diagram to break it down and show it as 10 x 19. 10 is from 2x5 so the primes are 2, 5, 19.
Multiple ways in, it just depends on the question asked and how you want to approach it.
Thank u so so much 💕 this is very helpful for me 😊
Thanks for your note, I’m glad I could help 😉😎🤗😃🤩💕
Thank you soo much it helped me a lot !!!❤❤😊
That’s great! Glad to help. You might find the second vid on this very helpful too. That one uses repeating primes: 3x3x3x3 and 2x2 if I remember my values right. It has a fun little bit during the collect all the factors step... Its also in my playlist Factors, Prime Factors. 😃🤗🤩
Thanks for telling I think I will do Great on my test thank you so much :)))))))))
The second vid, with the repeated primes is maybe even more helpful.
@@LetsDoMath Thanks but I've already done my test, after watching your vid the test was easy!!
I got 37/43 LETS GOO THANK YOU SO MUCH
It helped me to lot😊😊
Now look at the second vid with repeating primes. That will give you greater confidence to see the thinking a second time. 😉🤗
Thank you so so so so so so so so so so so so much 😊😊 im in grade 6 and I have 4 number equations vedio plz
So what to do when the numbers in😢 the LCM are same
Hi thx for the video! What do you divide the number by if it’s is odd? In this case, you divided it by 2, but how about when it’s odd?
Hi there. So I started with 2 because it's even (it's just my standard way of working). If a number ends in zero, I could also start with 5, because 5 is also clearly a factor.
If it's odd... well, hopefully your teacher curates numbers carefully for you, like I would. So if a number is odd, you should check to see if 3 is a factor. Use the rule of divisibility for 3 to check this out. I have a vid on this if you don't already know the rule. :o)
im tutoring a grade 5 student thats why i need this
I wouldn't use this with grade 5. Unless this person's a mega-brain, I'd use something much more accessible, like the one where we list them all line by line. In my playlist Factors, Prime Factors, it's the second method, 'Find all the Factors, Next Step'.
Ok, why did you divide by 5 after dividing by 2 in the first example of dividing 210?
Half of 210 is 105. Anything ending in 5 (or zero) is divisible by 5. I always take the easiest and most obvious divisor and use that.
@@LetsDoMathI had no idea. Now for the hard part that you’ve more than likely made easy! Thanks so much!
@@advgym glad to help. What’s the number you are doing? I’ll do it alongside you right now. I’m not ready for supper yet and I’m into this!
But how should I do it with 108? With this method I get 10 factors, not 12 based on google
For 108, you know that’s from 12x9, don’t you? Do you get that right off the bat. It’s even, so you know 2 is a factor. Divide 108 by 2 and get 54. Divide by 2 again and get 27.
2 crops up twice so 4 is a factor. Divide 108 by 4 and get 27 (already found that one, but you can see now you’ve confirmed 4. Think about 3… is it a factor? Well 3 is a factor if 9 and 12… yes it’s a factor. 108 divided by 3 = 36
Thinking in terms of those rainbows we use when we start factoring…
1 x108 on extreme outer edges
Then 2x 54
Then 3x36
Then 4x27
2 and 3 are factors, so 6 is too. 108 divided by 6 = 18
Then 6x18
And in the middle spot, 9x12
You do get 12 factors. Did you forget 1x108?
@@LetsDoMathI have so much respect for you, that you came back 6 years later to answer a struggling student’s question. Thank you for all you do.
Hi i am in grade 6 this helped me a lot
This video did not really help me but I am sure it will help others :)
You might find the second one a better fit. That's when we have repeating primes in the factorisation.
Thank u, i was looking for this