Math Trick - Difference of Squares 📚

To get your free eBook "How To Calculate Percentages In Your Head", please click the link below:


To join our online course "Turn On The Calculator In Your Head (Basic)", please click the link below:


Following courses will be launched soon:

1. Turn On The Calculator In Your Head (Intermediate)
2. Turn On The Calculator In Your Head (Advance)
3. Fractions, Decimals, Percentages
4. How To Become A Guinness World Record Holder Yourself
5. Abacus Basic (Addition & Subtraction)
6. Green Math (All Math topics from grade 3 to grade 10)

You can reach us at:

Also, feel free to ask if you have any questions.

Ability to calculate in your head can build your confidence and improve your studies like no other skill. And when it does, you earn the opportunity to change lives. Master The Numbers. Help Your Class Fellows.

If you are a student of grade 6 to grade 10, this channel is particularly for you and for all others who want to be able to calculate in their heads? We help you master the numbers, play with them, manipulate them, calculate and handle big numbers in your head, and much more. Wonder what these skills can do to you?

- Boost your confidence.
- Show off. Become life of every gathering.
- Stop struggling in Math.
- Improve grades.
- Break calculations world records.
- Make you look like a genius.
- Most importantly, help others.

Join us!!!

[nikachimes]

I like the way you simplify your answers…in school a lot of times some teachers made it so hard to understand it…thank you…💫✨☀️

[NekkropheliakkFetuzz]

I would of been in calculus if i had a teacher like u thanks for showing me now i can show my kids and friends!

[MsTERRY]

Wow really what happened in the 70's I needed this

[northernirishasmr]

I knew with doing much math. If you take 101 x 101 the answer has to have a 1 on the end as 1 x 1 is 1.
Then 99 x 99 answer has to end with 1 as 9 x 9 is 81.
Once you minus 1-1, the final answer has to end with a 0 so 400 only option.

[bullymaguire]

In other words, he is using identity A²-B² = (A+B) (A-B)

[nhowie]

Simply

What is 678³-590³
(88)×3
264

[gmanblue]

Let X=101. Now simplify the equation X^2-(x-2)^2 to get 4x-4. Substitute 101 for X....404-4=400.

[coderhub-tech]

One time in class I messed around with the difference of positive squares, turns out the difference between one square to the next square, for example 5² to 6² is 11, do this with the first few numbers up to 5 (including 0²), you will get difference of 1, 3, 5, 7, 9, 11 and onwards. What you could do is take the 100th odd number and add the 101st odd number to get the answer, which is cool I guess.

[rayyy]

Where was this guy when I was growing up

[chrisryan]

These are great ways to solve these problems.

[TravelPoint-yq]

Unit digit of 1 square is 1 and unit digit of 9 square is also 1 so, 1-1=0
So correct answer is 400

[Dbenzsanz]

Sir does this apply to all equations .

[sunilnaikar]

No need to do that, last digit of square of 101 will be 1 and last digit of square of 99 will also be 1, so 1-1=0, last digit of answer will be zero, so 400 is the answer

[lilrex]

This man single-handedly going to be breaking the US math curriculum

[tunguyenthi]

101^2 -99^2 =
(101 +99 ) × (101 - 99) =
200 × 2. = 400

[muhammadanas]

1 squared ends with a 1
9 squared also ends with a 1

1-1 = 0 so the answer ends with a 0

[intheheatoflisbon]

Where were you in 2006? When i actually needed you watched a few videos and everything makes so much sense

[vamsipunuru]

For quick, Subtract Last digits square 1-81
Ends with Zero

[deepblue]

Geez I needed this back when I was in high school.

[caliviking]

I’d like every teacher I’ve ever had responsible for teaching me math, to be fired.