2. Multiply Large Numbers

Multiply Large Numbers

If you don't have a calculator on you, and you don't have the patience to multiply a double digit number by another double digit number, then you can use this simple trick.

Just subtract the numbers you have from 100, and add those two numbers together.

The answer will start with the number you've gotten subtracted from 100, and will end with the two numbers multiplied together.2

Pi
Explore more ...