arvicpolvs

Math is everywhere. Calculations are everywhere.

2 x 2 = 4

Simple.

5 x 9 = 45

Hmm.. easy.

what about 26 x 5?

"oww.. gotta check the calculator app"

"..wait"

"It's 130!"

What if you didn't have access to a calculator and you have this problem:

122 x 5 ?

And you need to answer that mentally??

Here's the trick:

* divide 122 by 2.

-- that's 61

* no remainder??

-- just append 0 at the end.. that makes it 610 !

-- if there's a remainder, append 5 otherwise..

now, try 31 * 5 !

2 x 2 = 4

Simple.

5 x 9 = 45

Hmm.. easy.

what about 26 x 5?

"oww.. gotta check the calculator app"

"..wait"

"It's 130!"

What if you didn't have access to a calculator and you have this problem:

122 x 5 ?

And you need to answer that mentally??

Here's the trick:

* divide 122 by 2.

-- that's 61

* no remainder??

-- just append 0 at the end.. that makes it 610 !

-- if there's a remainder, append 5 otherwise..

now, try 31 * 5 !