9 is a magic number. If you take any multiple of 9 (18, 81, 162, etc.) and add those digits, you always get 9.

Everyone thinks 70 comes after 69 but it doesn't, mouthwash does.

e^(i*pi) + 1 =0

🦇Dun Nah Nun Nah Nun Nah.... Batman!

a^2 + b^2 = c^2

Another cool one is that any number to the power of 0 = 1, even 0.

0^0 = 1

Take any number, add up its digits. If the sum is divisible by 3, so is the original number.

Same with 9.

If the last two digits of a number are divisible by 4, the original is as well.

If a number has 2 and 4 as factors, 8 is also a factor.

If a number has both 2 and 3 as factors, 6 is also a factor.

Numbers ending in 0 are divisible by 5 and 10.

Numbers ending in 5 are divisible by 5.

Tips and tricks for ACT/SAT prep.

Another absolutely beauty.

I don't know anything cool.

I dunno about magic, and my math knowledge stops at quadratic equations — hell, musicians never have to count higher than 3 — but 121 (eleven squared) is a curious number in which to divide integers. Numbers 1 through 9, when divided into 121 all give infinitely repeating cycles of 22 digits, with patterns ever more curious as you examine them. For example, 1/121=
.00826442680991735537190082...
You list all the quotients from 10/121 down to 1/121, and you find staggered mirror images spreading up and down from these two:
6/121 = .0495867768595041322314049...
5/121 = .0413223140495867768595041...

1=2

7 8 9 😅

The formula is the same, it's the variables that are different.

That what you've said!😎

0+0=0

9x9=81 Is that right?

Me + Math = no way

Zero is a mistake.

1+1=2

I despise math

That I suck at math.

5 + 5 = 10 toes!