I'm a Maths teacher, and I almost feel guilty that I didn't already know about this method. I can't wait to teach it to my students. Nice one. Thank you 😊
@@zenithchan1646 Hey, We provide qualified online math and science tutors for students in grades one through ten. Currently, we operate in over 10 nations, including the United States of America, the United Kingdom, and Canada. Additionally, we provide three days of complimentary trial classes. If you're interested, contact us to schedule your first trial lesson.
@@PtelSh Hey, We provide qualified online math and science tutors for students in grades one through ten. Currently, we operate in over 10 nations, including the United States of America, the United Kingdom, and Canada. Additionally, we provide three days of complimentary trial classes. If you're interested, contact us to schedule your first trial lesson.
Why are you accusing this person of drawing when s/he is actually using the Japanese multiplication method? *awkward silence* You should probably look for a different job now.
Yeah I'm pretty sure that everyone's gonna think you're drawing something... Until they realize when you tell them that Japan has an easier method of multiplying numbers! Hahaha
*To teach the Japanese method to children, it is better to use different colors for units, tens, hundreds. It makes the task much more visual and easy to understand!*
For those wondering about numbers with 0s in the middle, just draw the 0s as dotted lines without counting any intersections with the dotted line. Just as the normal 0, the dotted line 0 is just there to tell apart the decimal bases.
I know I'm late, but I've been looking at ways to help my daughter who is struggling with her learning disability. Not saying this is a cure all, but honestly, this might be the best thing I've seen to help her. Thanks!
This trick is absolutely amazing! It has helped me out SO much. No need to re-organise where the calculators are every day in class or any need for calculators at all! Thanks a million! Ur the best!
Hey, We provide qualified online math and science tutors for students in grades one through ten. Currently, we operate in over 10 nations, including the United States of America, the United Kingdom, and Canada. Additionally, we provide three days of complimentary trial classes. If you're interested, contact us to schedule your first trial lesson.
I wish I knew this when I was younger. It would've helped a lot. I thought it was gonna be more complicated, but it was a surprisingly simple trick. I am glad I now know how to do this. Thank you.
I'm stunned. Shocked. Utterly floored. Never heard of this before. When I was in school, the ONLY accepted system was to somehow memorize the entire times tables of 100 abstract numbers, which always had certain numbers (like the 7s and 8s) that were orders of magnitude more difficult to remember than any others... and the system totally broke when going above 11x11. Even if you had the times table tattooed on the back of your hand, you were helpless without a calculator if you were working outside the table. Worst of all, as soon as you graduate, you no longer use any of it and rapidly forget everything above multiplying by 2. But seeing this... I have to ask: HOW does it work? What is the logic behind this system? Also, what if there's a zero in the numbers? I'm obviously not asking about multiplying by zero; I mean a number like 10, 20, 100, etc.
Great video, very visual and clear to understand. I attempted to use this method with higher digits (i.e 38 x 29) and got completely lost at where to separate the zones with so many lines all over the place 😂
Something else to add to my arsenal of stuff as a maths teacher. Useful for people unable to do symbolic calculations (dyscalculia is a pretty nasty thing).
Hey, We provide qualified online math and science tutors for students in grades one through ten. Currently, we operate in over 10 nations, including the United States of America, the United Kingdom, and Canada. Additionally, we provide three days of complimentary trial classes. If you're interested, contact us to schedule your first trial lesson.
This is an interesting method, but I think the true value of it comes from asking students why it works/how it works, rather than asking them just to apply it...as it is ineffective.
I agree that if you were to use this method in a lesson for students, understanding how and why it works would be a valuable exercise. Out of the classroom though, and in the day to day world, most of the time people do not need to understand why multiplying one number by another gives a certain answer, they just need the correct answer. This method will help them achieve that (could be useful if they haven't got a calculator to hand) and whether they understand how or why it works is largely irreverent, the technique is still effective and can serve real value.
DaveHax This method is too slow for 3 digits or higher. If you want practical and fast, "memorize" (in class, teachers should provide tricks and tips to do so) the multiplication table, and break them down to 10s (350 = 3 x10^2 +5*10 + 0). For really large numbers, this method really involves a lot of grouping and counting points etc. This method is mainly good as an example to ask student "explain why this works". It is only an "ok" method for day-to-day application (w/o calculator)/estimation in comparison to scientific notation etc.
Yes. Anyone who has done math in their head for a bit should know this, but it can be really fast. It not being fast is inexperience. All this method does is break up two digit multiplication into multiplying the tens, then the tens and the ones, and then the ones, and then adding them back up. It's okay, but you might as well skip the drawing if you're going to bother.
If you understand the technique you can also do this with "xxxx * xxxx" Just increase the amount of the "knot areas" with the numbers in the calculation: xx * xx=3 areas xxx * xxx=5 areas xxxx * xxxx=7 areas
This was absolutely amazing! I just wanted to know to multiply three digit numbers, but couldn't find anything. The I stumbled upon this and it was very helpful😊. Thanks for making the vid!😎
Nice tutorial, but I don't see any advantages of this method compared to the conventional one. It's in fact just normal multiplication visualised :) the drawing of the lines is redundant because either way you carry out the same steps as with the normal multiplication.
This method makes it easier to calculate big numbers with eachothers without mistakes (as long as you can draw a straight line). Most people will separate the numbers but that leads in many miscalculations. Drawing it out helps a lot.
My 6th grade math teacher just showed the entire class this... Just so you know, when you showed how you got each answer, everyone's jaw dropped in amazement 😂 Everyone now thinks you're the bee's knees!
Interesting trick and a very good visual explanation. After trying it I found out that counting dots is much slower then using a multiplication table. Try to do 6x8 or 98x76 and you'll see it yourself. For zeros inside numbers I used dotted lines - it worked (any intersection with a dotted line equals 0). But if to draw just 1 line for each digit with a number on its ends and at the intersections, then the picture is simplified and you just multiplying numbers at the intersections and then adding them as was shown. This way the speed is almost the same as doing it traditionally.
To multiply with 0 on it, go 0:38 and pretend it is 13 x 20 instead of 13 x 21. The where the 0 met means that there is no line, thus leaving it like an open 2d box. You count the dots IF ONLY THERE IS LINES THAT ARE INTERSECT. For example, 11 x 0. That should leave a parallel line with gap on the middle. Hence no lines have been intersect, the answer will be 0.
I know what youre thinking. Example 103x13 1 line no line 3 lines. Next 1 line 3 lines count 1 2 3 4 5 6. 6. Count the bottom middle 1 2 3. 3. Then Upper middle 1 2. 2 then. 1. Soo the answer is 1236
To help draw the diagram out you can draw the "zero" line as a single line, but draw it in a different colour, and then don't count any of the dots on this line. Do the rest of the technique as normal.
Littlebox cat It works. first you only draw line of the first digit (dont draw the ''0'') and then the other number - normaly. then when you make circles - again three,and then count intersections only that this time you first count the third circle, then the first and finnaly the middle one. So basically the same thing only the order in which you count is diffrent. But I haven't checked it for 400*58 or similar so i dont know about those.
HanyouxFromxHell haha sorry then, it's hard to perceive any emotions through text 😉 And yes you are right but it is good like that, so that we learn to use our brain cells instead of using technology all the time ...
To me I do it like this: 99 X 87 is like [90*80 +(90*7) ]+ [9*80 + 9*7] = 8613 90*80 90*7 9*80 9*7 and then add them all = Answer Always make it with tenth multiplication number because it will be the same normal multiply of 1 to 10 with you adding Zero to the end. So a 90*80 should be like 9*8=72 and add the Two Zeros which makes it 7200. Cut the 99 into 90 and 9 and multiply it with 87 which you do the same to it 80 alone and 7 alone. Should give you an easy time, at least to me. So 99*99 [(90*90)+(90*9)]+(9*90)+(9*9)] = 9801 401*21 = 400*20 + 400*1 + 0*20 + 0*1+ 1*20 + 1*1 = 8000 + 400 + 0+ 0+ 20+ 1 =8421 Complicated? To me not XD
This is equivalent to the standard method we learn at primary school. To see why, use larger digits like 89 x 78 and notice that, instead of counting intersections, you'll be multiplying digits, carrying and adding the carry to the next column - just like you do in the standard method. The difference is the standard method is quicker. It is quicker to write the digit '9' than it is to draw nine lines.
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I'm a Maths teacher, and I almost feel guilty that I didn't already know about this method. I can't wait to teach it to my students.
Nice one. Thank you 😊
Yes teacher but you know this is not short trick this is long trick
Hi ma’am
@@zenithchan1646 Hey,
We provide qualified online math and science tutors for students in grades one through ten. Currently, we operate in over 10 nations, including the United States of America, the United Kingdom, and Canada. Additionally, we provide three days of complimentary trial classes. If you're interested, contact us to schedule your first trial lesson.
@@PtelSh Hey,
We provide qualified online math and science tutors for students in grades one through ten. Currently, we operate in over 10 nations, including the United States of America, the United Kingdom, and Canada. Additionally, we provide three days of complimentary trial classes. If you're interested, contact us to schedule your first trial lesson.
@@PtelSh yea 😦
this tip actually made me pass math class! thank you so much!
Fantastic, glad it helped you out...
+DaveHax thanks for this vid! :)
pyropreben highly fought that
he said its useless at the end
I heard that too
The dislikes are the teachers staying "this isn't the method I taught you
Devon Smith id be like: too bad ms. I taught it to myself >:C
@mental case yes. I didn't even realize till now
Hahahah
also the voice is annoying
Right. I was showed a completely different way from my now 10 year old.
Me: *multiplies like this*
Math teacher: Why are you drawing in class?
Me: 😒 But I’m not.
Why are you accusing this person of drawing when s/he is actually using the Japanese multiplication method?
*awkward silence*
You should probably look for a different job now.
@@GreenBoy9000 😑 it's a meme dood
Yeah I'm pretty sure that everyone's gonna think you're drawing something... Until they realize when you tell them that Japan has an easier method of multiplying numbers! Hahaha
Urmila Gandhi it’s not a meme dood it’sa joke
you must say : this is just a technique
teacher : 😳 oh ok sorry about that
*To teach the Japanese method to children, it is better to use different colors for units, tens, hundreds. It makes the task much more visual and easy to understand!*
th-cam.com/video/3s7YLQPzKPM/w-d-xo.html
Woahkay
If number is 509 into 209. Then answer is wrong. Why?
why are you screaming like a lunatic tho?
IMPOSSIBLE!!! this trick it realy works! Why didn't we learn this at school?!
(or at least, i didn't learn that trick at school.)
lol yeah
We learned this trick since 2005
bitch this does not work with 0
I don’t think anyone did...
Lol. Our school has it
For those wondering about numbers with 0s in the middle, just draw the 0s as dotted lines without counting any intersections with the dotted line. Just as the normal 0, the dotted line 0 is just there to tell apart the decimal bases.
What about numbers with decimal points?
I am a visual artist an this has opened a whole new look on math, Thanks!
I know I'm late, but I've been looking at ways to help my daughter who is struggling with her learning disability. Not saying this is a cure all, but honestly, this might be the best thing I've seen to help her. Thanks!
Why am I so angered that I am literally shaking Bc I could’ve used this SO MUCH in elementary and middle school.
I- Same ugh Dumb me
For real tho !!! I consider myself a fool for always going for that usual long method!!😔😭
until u gotta show ur work
JOKES ON YOU IM GONNA USE THIS IN SCHOOL TOMORROW!
It’s trauma. You need to release the emotional debris from your experience trying to learn math
This trick is absolutely amazing! It has helped me out SO much. No need to re-organise where the calculators are every day in class or any need for calculators at all! Thanks a million! Ur the best!
Hey,
We provide qualified online math and science tutors for students in grades one through ten. Currently, we operate in over 10 nations, including the United States of America, the United Kingdom, and Canada. Additionally, we provide three days of complimentary trial classes. If you're interested, contact us to schedule your first trial lesson.
Why would you need a calculator to calculate 32*12 😂😂😂😂
But how does it work when there's a zero in the number?
when u multpily by zero it's always zero so if no lines cross each other then you write the amount of crosses which equals zero
yes like 200 x 170
that is ez ; 2 x17 = 34 then add the 3 zero = 34000 ,
you dont need to draw.
Christel i was thinking the same, e.g 5201 x 150..
Christel you r crt bt draw dummy line for zero's.. then u got a ans...
You've explained this better than anyone else I've seen. Well done!
wait a minute, I can actually have fun multiplying and still make it easier, teachers need to start teaching this
th-cam.com/video/3s7YLQPzKPM/w-d-xo.html
I wish I knew this when I was younger. It would've helped a lot. I thought it was gonna be more complicated, but it was a surprisingly simple trick. I am glad I now know how to do this. Thank you.
You know dave, i got 9+ or B+ from math test because i remembered this :p
Joel Sorri Awesome, I'm glad it helped you out...
+DaveHax wow, this is something deserving a Nobel prise
+EXCOTO *price*
+DaveHax what if we had to multiply 4598x1707 ? what about the zero ??
+Omkar Veneno if there are no crosses then write a zero
Teacher: Show your work
Me:
I'm stunned. Shocked. Utterly floored. Never heard of this before. When I was in school, the ONLY accepted system was to somehow memorize the entire times tables of 100 abstract numbers, which always had certain numbers (like the 7s and 8s) that were orders of magnitude more difficult to remember than any others... and the system totally broke when going above 11x11. Even if you had the times table tattooed on the back of your hand, you were helpless without a calculator if you were working outside the table. Worst of all, as soon as you graduate, you no longer use any of it and rapidly forget everything above multiplying by 2.
But seeing this... I have to ask: HOW does it work? What is the logic behind this system?
Also, what if there's a zero in the numbers? I'm obviously not asking about multiplying by zero; I mean a number like 10, 20, 100, etc.
Why did you say "if you want to see more useless tricks" in the end of the video?
yeah did he said that
Rakker de hond by
bacause thats right hand side video is useless the flowting flower is useless so it ussless
Rakker de hond yes he said at 4:04
That's because about 95% of people don't use this method, and it's nothing more than a "Fun Fact"
Great video, very visual and clear to understand. I attempted to use this method with higher digits (i.e 38 x 29) and got completely lost at where to separate the zones with so many lines all over the place 😂
saaaame, (28×12).
The ultimate Asian maths trick. Ninjas will assassinate you withing 15 minutes.
Something else to add to my arsenal of stuff as a maths teacher.
Useful for people unable to do symbolic calculations (dyscalculia is a pretty nasty thing).
I don't want to have to multiply 999 x 999 with this method...
why not? its much better then 99999 x 9...
tetsubo57 try (1000-1)x999
Xtreme Dummy try (100000-1)x9
Stop making it harder than it has to be. LOL
Half the number x amount of times then times it, just remember to add on how many you halved
999 x 999 = 999 x 1000 -999 = 998 001
funny guys... mainly if the joke is already told...
Love this guy! He's straight forward, clear and doesn't take much time to teach. I understood this in less than 4 mins.
Hey,
We provide qualified online math and science tutors for students in grades one through ten. Currently, we operate in over 10 nations, including the United States of America, the United Kingdom, and Canada. Additionally, we provide three days of complimentary trial classes. If you're interested, contact us to schedule your first trial lesson.
I'm past 10 grade, so that can't be possible.
Feels good that our method has spread all across globe and people love our method... 🤗
This is an interesting method, but I think the true value of it comes from asking students why it works/how it works, rather than asking them just to apply it...as it is ineffective.
I agree that if you were to use this method in a lesson for students, understanding how and why it works would be a valuable exercise. Out of the classroom though, and in the day to day world, most of the time people do not need to understand why multiplying one number by another gives a certain answer, they just need the correct answer. This method will help them achieve that (could be useful if they haven't got a calculator to hand) and whether they understand how or why it works is largely irreverent, the technique is still effective and can serve real value.
DaveHax This method is too slow for 3 digits or higher. If you want practical and fast, "memorize" (in class, teachers should provide tricks and tips to do so) the multiplication table, and break them down to 10s (350 = 3 x10^2 +5*10 + 0). For really large numbers, this method really involves a lot of grouping and counting points etc.
This method is mainly good as an example to ask student "explain why this works". It is only an "ok" method for day-to-day application (w/o calculator)/estimation in comparison to scientific notation etc.
DaveHax hu
Anyone else calculated it faster out of there head ?
Yes. Anyone who has done math in their head for a bit should know this, but it can be really fast. It not being fast is inexperience.
All this method does is break up two digit multiplication into multiplying the tens, then the tens and the ones, and then the ones, and then adding them back up. It's okay, but you might as well skip the drawing if you're going to bother.
Jhb
If you understand the technique you can also do this with "xxxx * xxxx" Just increase the amount of the "knot areas" with the numbers in the calculation:
xx * xx=3 areas
xxx * xxx=5 areas
xxxx * xxxx=7 areas
so there are n-1 areas, where n represents the total amount of digits
This makes way more sense to my brain than they way they taught me in school 🤯
This was absolutely amazing! I just wanted to know to multiply three digit numbers, but couldn't find anything. The I stumbled upon this and it was very helpful😊. Thanks for making the vid!😎
Could u do one with numbers including one of the upper digits like 7,8 or 9? It would be really helpful
This got me threw college I love you Dave
The teacher's multiplication is very intuitive
Not useless my friend but actually very functional for those of us that see and interface with the world visually. Thanks for the video I loved it.
Nice tutorial, but I don't see any advantages of this method compared to the conventional one. It's in fact just normal multiplication visualised :) the drawing of the lines is redundant because either way you carry out the same steps as with the normal multiplication.
funnier to draw lines than just write NUMBERS
This method makes it easier to calculate big numbers with eachothers without mistakes (as long as you can draw a straight line). Most people will separate the numbers but that leads in many miscalculations. Drawing it out helps a lot.
LOVE IT! SOO GOING TO USE IT!
THANKS!
Angel Spear i really like this
Love the method....made me more expert in math..... :)
Wow, Math! Cooking! Gadgets! this channel is amazing!!
My Grandfather taught me this and he’s gone, I miss him. As a remembrance I use this method even If it takes too long and share it to everybody
Oh God , I am here so early , let me type something to get likes.
There is also such a method to divide?
My 6th grade math teacher just showed the entire class this... Just so you know, when you showed how you got each answer, everyone's jaw dropped in amazement 😂 Everyone now thinks you're the bee's knees!
I'm terrible at math--yet I totally understood this the first viewing--love it!
I don't have the word's to phrase you…literally speechless
You are amazing bro…plz share more videos 👍👍👍
Interesting trick and a very good visual explanation. After trying it I found out that counting dots is much slower then using a multiplication table. Try to do 6x8 or 98x76 and you'll see it yourself. For zeros inside numbers I used dotted lines - it worked (any intersection with a dotted line equals 0). But if to draw just 1 line for each digit with a number on its ends and at the intersections, then the picture is simplified and you just multiplying numbers at the intersections and then adding them as was shown. This way the speed is almost the same as doing it traditionally.
To multiply with 0 on it, go 0:38 and pretend it is 13 x 20 instead of 13 x 21.
The where the 0 met means that there is no line, thus leaving it like an open 2d box.
You count the dots IF ONLY THERE IS LINES THAT ARE INTERSECT.
For example, 11 x 0. That should leave a parallel line with gap on the middle. Hence no lines have been intersect, the answer will be 0.
+Hayun Hong 11 x 10 also leaves an open 2D box, therefore the answer should be 110.
Alright this is my new way of multiplying big numbers now Arigatou Gozaimasu 🙏
Wow, this is VISUALIZED math! Its like visualizing math from a different perspective!
Dave...this trick is soo amazing!!!!!!!!!!!!!!!!!!!! Now on i will rock at long multiplication!
Where was this when I was in school?? Waaa 😤😭
Hello
try this on 999 x 965
Quick maths
everyday man's on the block...
see your girl in the park
quik maffs
That girl was aqus
Thank you so much! This will really help me out!
I'm extremely bad at math, but with this method I am sure I will get somehow further! Thank you Dave!
Wow I am struggling with math but this REALLY help me. At least there some useful people on this earth.
Oh also japanese People are so clever and they are people who lives traditional and works hard in Job and there streets are so clean.
This makes me pissed cuz I cant do 621×14, I'm bouta break everything in my house
Omg same like he only did tiny 3 digit numbers like 123× 12 like im getting white hair over here
@@abelhernandez9971 ong
use the latice method
It makes me proud that I calculated that in my head and got the answer after few seconds of visualization😳
@@fairytale5629 but that shits boring as
This is so AWESOME Dave thanks for sharing with us 🙂
The American school system broke I cry 😭😭😭
I still struggle with maths in my 30s and to do a nursing course they asked me to do maths again and I was panicking but this is fun!!!!!!!
I am lost for words. This is too mind-blowing!!!
The thing is that this only works with Natural and - numbers.(English is not my native so I don't know what they are called on English).
negative?
I almost wish I was educated in Japan. x3
This really is clever but what about numbers with a zero? 204x1000 for example?
Just add the zeros to 204, 204000... Different tricks in different situations
OMG THANK YOU! You help me to math! THANK YOU! I'm from Lithuania, i not so good talk to English. I love your videos!
For me, myself, I think this trick is more complicated than the original trick. But still, fun to watch.
GENIUS JAPANESSE GUYS!
Illuminati confirmed...
Another sheep making fun of the unknown to him confirmed...
PuebloRevolt91
another stupid bitch who can't get a joke confirmed
why did you say "if you want to see more useless tricks" at the end of the video? LOL
Lmaoo
Cos this is useless
I'm mad that I wasn't taught this. I would have loved this method.
Thanks man! I became the master of multiplication on my school 👍👍
We should show this to Common Core
Common core is one of the worst mistakes in today's education in Murica'.
Anders Forsgren startin with saying "Murica"
Wtf is common core?
my math teacher showed this in class n I was like holy fuck its Dave haxs
hey dave now I will pass,you r mind blowing
You are a better multiply teacher
That’s a great and funky way to find the answer for multiplication. I will subscribe, like and hit the bell and select all
What if. There's a 0
+GURU Vincent Just ignore it then.
if it's only 0 the answer is 0
+GURU Vincent you write over the "crossing spot" a "0" and everything is fine :D
I know what youre thinking. Example 103x13 1 line no line 3 lines. Next 1 line 3 lines count 1 2 3 4 5 6. 6. Count the bottom middle 1 2 3. 3. Then Upper middle 1 2. 2 then. 1. Soo the answer is 1236
103 x 13 = 1339
what if there is a zero like 170 x 15?
To help draw the diagram out you can draw the "zero" line as a single line, but draw it in a different colour, and then don't count any of the dots on this line. Do the rest of the technique as normal.
just simply remove the zero, then add it back later
it will become 17 x 15 x 10
thanks
and what if we have 109*17 ? explain this if u can ??!
Holy fuck is this easy!
Cmon man just tell me who created this, i wanna give that person a nobal prize
Amazing that multiplication can be pictured into something geometric
I want to buy this man a beer.
How do you use this with decimals?
multiply out the decimal then later divide it back in
how to use it with zero. like 30x59
dont draw a line, i guess, since im eating pizza and cant be bothered to wok it out :)
***** it doesnt work
Littlebox cat It works. first you only draw line of the first digit (dont draw the ''0'') and then the other number - normaly. then when you make circles - again three,and then count intersections only that this time you first count the third circle, then the first and finnaly the middle one. So basically the same thing only the order in which you count is diffrent. But I haven't checked it for 400*58 or similar so i dont know about those.
when I first saw it I was like hmmmm not bad but when complicated comes I was like how about taking your phone out :/
As an IB student we need to do that in our head lol ^^
because with actual tests, you're not supposed to use a calculator :p
HanyouxFromxHell is that sarcasm sir?^^ and no sadly chemistry and a math paper are calculator free ;)
No, I was being serious lol With tests, you're not supposed to use a calculator, and generally you're made to show your work lol
HanyouxFromxHell haha sorry then, it's hard to perceive any emotions through text 😉 And yes you are right but it is good like that, so that we learn to use our brain cells instead of using technology all the time ...
Wow this is also great idea... Thanks for sharing this... Keep up the good job and godbless ☺️👍👍👍👍👍☺️
I love this method 😍
wow thanks japan
Alisha Das ,hbjaaufykakfjyafguakfyukauyfkayfukauygkygukayugkayugayugkgayila
XD that ending was hilarious, " And for more USELESS tricks" XD
ليس الذكاء أن تحل مسألة بل الذكاء كيف تبتكر طرق أسهل لحلها
طريقة جميلة
4:03 it's not useless my friend. It's very useful for non math people in exams
Wow this method helps us do math problems with multiplication so easy to learn
Awesome
Woow M-1 Garandcsy Áron egy új fegyver típus!
Régen mindig azt hittem,hogy így ejtik és így írják a neved Karancsy.
+Aron Karancsi x
طريقة امي الله يطول بعمرهااااا
ghadeer 1h حتى انا الله يحفظلي امي ويحفظلكك امك
What if it's 99 x 99 Lolz
MathyPure 100x100 =10000
10000=99+1 × 99+1= 99×99 + 2×99 +1
99×99= 10000- 199=9801
Azy Atlas plug it into a calculator its 9801, stop using these pathetic childish methods
To me I do it like this:
99 X 87 is like [90*80 +(90*7) ]+ [9*80 + 9*7] = 8613
90*80
90*7
9*80
9*7
and then add them all = Answer
Always make it with tenth multiplication number because it will be the same normal multiply of 1 to 10 with you adding Zero to the end. So a 90*80 should be like 9*8=72 and add the Two Zeros which makes it 7200. Cut the 99 into 90 and 9 and multiply it with 87 which you do the same to it 80 alone and 7 alone. Should give you an easy time, at least to me.
So 99*99
[(90*90)+(90*9)]+(9*90)+(9*9)] = 9801
401*21 = 400*20 + 400*1 + 0*20 + 0*1+ 1*20 + 1*1 = 8000 + 400 + 0+ 0+ 20+ 1 =8421
Complicated? To me not XD
1Piecer Wowww!!!! this will help me with my studies!!! u r so smart!! thanks for mentioning 0😀😀
Mamata Paikaray Glad that helped you, enjoy and question anything because the simplest math equation must have an important application in real life.
This is equivalent to the standard method we learn at primary school. To see why, use larger digits like 89 x 78 and notice that, instead of counting intersections, you'll be multiplying digits, carrying and adding the carry to the next column - just like you do in the standard method. The difference is the standard method is quicker. It is quicker to write the digit '9' than it is to draw nine lines.
It's not about speed, Rob. Many students just can't learn multiplication the standard way. This is just an alternative.
Teacher show this in my class . To teach . Thanku soo much. I have learn this
what to do when their is 0 in digits
you draw 10 lines
+JDoactive Thanks!
Do a dotted line
Naveed Akbar Yes. Draw a dotted line and write a zero in that column. If it's in the middle column, then don't add anything to the previous number.
DO NOT DRAW 10 LINES!!! That is incorrect
هل من عرب
Wow. Your maths teacher would be impressed
Thank you it helps me out I passed first time in maths.
Your things arent useless it helps me
i followed the link from the hand counting
this is only as impressive
ty again