Subtraction Trick - avoid the borrowing! Easy maths lesson.
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- เผยแพร่เมื่อ 19 ก.ย. 2024
- It is easy to avoid borrowing when you are subtracting if you minus by pairs of digits rather than individually. Use this method to do lightening fast subtraction calculations with no problem! In this fast and easy math lesson you will learn this pretty obvious trick, and be subtracting faster than ever before!
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"There's no way I could look at that 3 digit number and maintain my sanity" - best part ever
♡♡♡
🤔
You are pathetic. You are getting on my nerves. Learn.
@@powerofroses1670 Wrong use of periods How bout u learn how to use them
@@nanayvlog5625 there called short sentences.
I have an easier method:
for e.g.: 32-18:
1.: look at the second digits first: you notice it is bigger in the second number, so you gonna subtract one more from the first one.
So instead of 3-1, there will be 3-2, which is 1.
2.: in the second digits, because it is bigger in the second number, you subtract backwards:
8-2, which is 6.
But what you write is not six, but it's complement (or compliment, dunno, which you add it to make the number 10. In this case it is 4, because 6+4=10)
So then your number is 14.
Hi ! What if it's three digits? Say 674 - 589. Thank you !
Parker Leigh I will show it on a 4-digit number, to make the whole concept understandable.
6742-5896
1. look at the second digits (7 and 8); you see that the second one is bigger, so we withdraw 6 instead of 5, the first number will be 074.
2. Subtract backwards: 8-7=1, write it's 10-complementer (9 in this case, 1+9 is 10), the second digit is 9 (counting the initial zero).
3. Before writing down 9, look at the next digits, see it is 4 and 9: the second is bigger, so the previous digit will be one less, 8 in this case.
4. Backwards subtraction: 9-4=5, 10-complementer: 5. 85 so far.
5. Before writing down 5, look at the next digits (2 and 6), again, the second is bigger, so it will be 84, backwards: 6-2=4, 10-comp.: 6, so the final answer is 846.
It looks complicated, but only in written form, in the head it goes really fast, and no need for writing helper numbers, or memorize too much things in your head.
***** Thank you so much !!!!
Parker Leigh You're welcome!
***** That's a brilliant method! I love it!
Though I'd explain it in short like this:
6742-5896
1st digits: 6 - 5 = 1 (if next digits has smaller top then -1) = 0
2nd digits: 8 - 7 = 1 (difference of 10) = 9 (as above -1) = 8
3rd digits: 9 - 4 = 5 (difference of 10) = 5 (as above -1) = 4
4th digit: 6 - 2 = 4 (difference of 10) = 6 (no next digit, just leave it)
answer: 0846
At 4:47 when you were subtracting 6527-3428 and you were doing the step of 527-428=099. You could have used the counting up method which is great for doing mental math to avoid borrowing. So first you would look at 428 and bring it to the next ten which is 430. so you would have 2. then you would bring 430 to the next 100 which would be 500. so you would have 70. then you would subtract 527-500 which is 27. then you would add 2+70+27=99.
i searched up this video because people in my class get like what’s 356 - 245 and like they get the answer correct in just like 3-5 seconds I’m just sitting there like an idiot still trying to make sure 😂
Same
i really admire your enthusiasm and hard work to make this more easier
Am I just stupid or did the system fail me. I can’t do addition and subtraction in my head as can the majority of people I come across 🤷🏽♀️. Why do we give kids calculators.
As a secret... I've completed Math 1050 with a B+.... And math 1010 with an A.... And I don't know basic subtraction, division or multiplication... feel autistic as F*** and that's why I am learning the "better" methods.
The issue here is that schools only teach the 'traditional method' of addition & subtraction where you work the sum out going from the left to the right (i.e. units tens hundreds in that order). But if you try to do simply sums this way in your head you will fail because you are having to store so many numbers that it gets to difficult for most people. What you were never taught was how to add and subtract numbers going from left to right (i.e. starting with the big numbers first and working down to the small numbers; hundreds tens unit). Just because you didn't learn it then doesn't mean you can't learn it now. Just google Mental Maths or Speed Maths or watch this channel to learn these techniques. Addition makes up 70% of all business maths so its a good skill to try and improve. Giving kids calculators at school causes their brain to turn into cabbages (proven fact). Lol
The system clearly failed all of us. They don’t innovate in their teaching technique, hence, we were never taught more efficient and simpler ways to do things.
Really!!
Yes the school system clearly fail us on purpose by design to keep us dumb !!!!
Your teaching style is something to marvel at. Many thanks!
THANK YOU THIS IS SO GOOD! I showed my maths teacher this
I do like this:
6527 - 3428
- 1st: 7-8 (7 < 8), so I do 17 - 8 and I add 1 to digit before 8
- 2nd: 2-3 (since I added 1 from the 1st step): same method as above
- 3rd, 4th.... and so on
:) Much easier
Dude this is awesome !!! thank you everytime I’m on your channel I learn something new 😁
you sir are a master!
When you have multiple trailing zeros on top, you can reduce both the minuend and subtrahend by one.
this is fantastic, borrowing is nightmare.
This guy has all the secrets of the universe :D
I could learn how to do this, but I'd never remember it when the time came to use it. That's the problem with many (most) so-called shortcuts. They would be of great help if, for instance, you knew you were going to have a test in the next few minutes, but of little or no value in most situations. You would be confident of the answers obtained by using the traditional method, but not with these "short-cuts," That's the problem with most of them. You'd have to double-check them by addition, so their advantage would be greatly lessened. Oh, I might add that your methods for subtracting two-digit numbers are something else. They work and are easy to remember. I will use them from now on.
Still watching in 2018! Thank you, Tecmath!
Try the method of looking at the difference between the numbers, when bottom one is bigger than top and convert to complement. Ex: 1-7, diff is 6 complement is 4, the answer. Then next column to left is 4-5 is 1, so complement is 9 but reduce by 1 following sutra all from 9 and last from 10.. Continue left columns until number subtracted lower than number above.
I'm loving these videos and have learned loads.Awesome accent,don't lose it!
OMG, i wish i knew this in high school! why cannot teachers show us this simply1
Takes the fear out of MATH
Bhi bhi N nj MmJM my nj mj nj MMM nmoM7 my iMMmMa MMarie mmNM nj nj mn6k Mm nhi M m my m6M nun
Hey Teach, I found an easier method for the last example...reversed calculation so u have 1 minus 7, u know u will borrow, but u ignore the other digits so u think, ok what + 7 = 11 and it's 4. Then u have 4 but now it's 13 so what plus 5 = 13 and it's 8, then u have 1 that is now 10 - 2 is 8 and so on, taking one just adding 10 and subtracting 1...easy,,, try it
Very cool. Makes subtraction much easier, quicker.
Thanks for this vid! i'm in 4th grade and i could not under stand subtraction this helped thank u!
Multiple digits at a time, really helps.
Thank you so much... The kids homework wrecked my brain, u made it easier
*AT TIMESTAMP [**06:15**]:*
Subtracting 23142 from both sides is another easy way to deal with this equation.
Thank you
Solution:
Reverse it,
175857-623141=-552116
Now, get the compliment numbers of 10 for last digit, 9 for the rest.
Answer: 447886 (neglect negative sign)
Ur a genius
@@RandomPersonsURL Thank you. Oops, that should have been 447884 😂 I hate the borrowing method.
This guys voice scares me :o
😂
😂😂
Maths 🧮 scares you
You gonna cry?
😂😂😂😂😂
Next video please say clearly. Good teaching
THANKs..techmath is doing a great job...keep it up!
But we still have to borrow in the second stage don't we?
There is no escaping the borrowing.
Hello how were the 7 yearss
Thank you Tecmath. I found this so efficient!!! :))
I think the normal standard form strategy is the best it makes more sense
You should have been a maths teacher
He is or?
Excellent
Thank you so much cool 👍💕💕💕
ok, so you are doing the quicker way .. 6318-1264= 8 take 4 = 4 but how do you do the 31 take 26 so quickly?
I think the last problem would be solved quicker if we use the complementry number rules. 623,141-200,000+24,743
the complementry number can be worked out using the 9.10 rules on previous video
Very impressive method.
🔥🔥🔥🔥🔥🔥 thank you.
Thanks for the trick
Wow amazing . Thank you
there's a better way to subtract it by adding and carrying over the ten's to the bottom number. It allows you to add numbers insanely large and quickly. You can normally beat people using a calculator to subtract 12 digit numbers, by using the adding method. Can solve, faster than they type it out.
Good method
Awesome - thanks
Very helpful sir
Thank you, how would we work out 2356 - 3467?
Still the same, essentially.
You could borrow/add digits on both ends: 10−(16−7), then 10−(14−5), which is actually 10−((15−1)+(−6+1)), up to 0−(−1+1)
or you could just add the differences, like this:
2000 − 3000 = −1000
300 − 400 = −100
50 − 60 = −10
6 − 7 = −1
(−1000) + (−100) + (−10) + (−1) = −1111
Both these methods are logically the same, manual burrowing/adding is just often overly complicated, with the exception of numbers that fluctuate a lot, like 51729328 − 27153760, where nearly every digit needs to be carried (which is often hard to tell beforehand if you have a lot of numbers in one calculation.)
Other than that, just watch the sign and any size numbers are fairly easy to subtract.
+Dalbir Jubilee Just reverse it. So, 3467-2356, then add a minus sign after your result.
Obviously.. but that wasn't the point really..
Other method:
14792 - 1045
You'll notice the last digit in the first number is less then the last digit in the second number.
so count until you wrap around...
14792 -1045,
14791 - 1044,
14790 - 1043, (if you start here, your very lucky!)
14789 - 1042.
Done! Now just do the regular method.
And the answer is 13147!
It's rare but... you might have to repeat this method, here is an example.
14042 - 1795 (variation of the first example.)
14042 - 1795,
14041 - 1794,
14040 - 1793,
14039 - 1792.
But we only get our last digit. so we have to repeat. ( 7 )
1403 - 179,
1402 - 178,
1401 - 177,
1400 - 176,
1399 - 175.
And we got the answer:
12247!
It actually works! check it!
New tax year 2016 so had to remember how I was doing last year . 2015 was much easier to subtract your birthdate !
you know how 5 & 7 are always together on sudoku?
6:17 has something to show
For 3 digits number it is OK, but for bigger numbers it is still to much of borrowing, doesn’t make it easer.
One can also use the vedic sutra, all from 9 and last from 10.
thats a nice trick
you are the best
Be good in ADDITION and you will be aided in MULTIPLICATION AND SUBTRACTION and Division in some cases
tq u sir for the explanation.actually where r u from ur accent is fantastic sir
thank u very much
6527 - 3428 = 3099 by head. 428 + 100=528, but the numerator is 527, so it's 099.
Thank alot man your are best at math 1+sub
I dont understand how to do the problem 623141 - 175257 ????
Neat trick!
And homework's was like, Hard yeah hard yeah like baby baby baby no!
such a useful thing
U really an intelligent man
Really cool
what about 3025 - 1089
3025
1089
what about 2 zeros
wow .thanks
just a question do you use a note pad behind the camera??
(just curious lol) but i dont doubt you with your intellegence
Im struggling about borrowing . Thats why im here
Great!
erm where did 40 come from at 7:41 ??? Did he mean 64? (add 3 to 17 to make 20, then add 3 to 61 to make 64 and then subtract to make 44)
We should talk, tecmath! I want to trade math with you. ;)
I'm sooo mad they taught us the hard way in school 😩😩😂😂
alexis Franzke I agree with you! Why is it that in schools they teach us the hard methods and not short ones? It would make life so simpler!
Good
I’m quite young and I wanna Get my first job soon but I’m horrific at mental addition/subtraction so I’m worried about working at a register
is there any chance of you redoing your older videos with a better mic?
nice work man my mother like it
That very large number I would just go from left to right and reduce by 1 where the next column is less than zero
so what happens when the answer will be a negative number? e.g 33-75
I never did Subtraction and hated doing it, untill I saw this video.
Hate fractions more
InsertL
Look at it as an addition problem. You are given two numbers; one is greater than the other. How much do you have to add to the lower number to get to the bigger number?
Here's another method using 10 base. 53 - 28. Since you can't take 8 from 3 yo put a dot above 2 which counts as 1. Then find the diff between 10 base and 8=2. Add 2 to 3 =5. Then subtract 3 from 5 to get 2. You subtract 3 because the dot above 2 = 1.
William Wheeler
The biggest problem is though, that pupils cannot do 35 - 27 = 08. The whole point is that an algorithm reduces sums into multiple single digit number bond sums.
With practice comes speed. The key is finding out how students do these sums. For beginners they would count with their fingers 27 to 30 = 3 so 3 + 5 = 8. But if they learn to use number bonds they see that 27 requires 3 to become 30 and 3 + 5 = 8. As they progress they learn the fact that 7 to 15 is 8 therefore 27 to 35 = 8.
What program do u use form the writing ?
I love how he giggles sometimes because he loves maths
Avoid the borrowing! next minute.. yes you have to borrow
Does he have simple tricks for kids?
ur good
But you ARE still borrowing, just doing it with simple easily visualize set of numbers. subtracting 27 from 35 still involves borrowing, but it is simply a smaller easier to see -intuitive, if you like, borrowing. Of course, I solve this left to right and my mind simply does the borrowing as it goes.
wbt 1111 - 999 how do you slove this ?
2356 -3467 will be come in negitive form -1289
I still dont get it someone pls explain :((
Why is the far left column always 0?
I used this trick since I was grade 2. Now I'm in grade 6
527 - 428
= 528 - 1 - 428
= 528 - 428 - 1
= 100 - 1
= 99
his accent had me thinkin he said 78😢 when he said 17😅
2:46 nice laugh lol
At 7:10 where does he get 43+41=84 ?
Compliment numbers. To round 57 to 100.
141-57=141-57 (-43+43)
141-57=141-100 (+43)
141-57=41+43
Ans:84.
I find the standard method to do subtraction hard to explain.
Michael Empeigne I find standard in general puts me to sleep.
Michael Empeigne with no right answers or clarity on what to do.
and to top it off more work.
It's the Khan Academy Biology's voice
In the last step - perhaps it the accent- how do you subtract the 17 from the 61? I can't follow the explanation.
Yes please explain this step to me.