Math x Math

You can solve this problem in two ways:

• Using a calculator.

OR

• With this method. Multiply 9 x 9 and get 81 and add all the zeros after 81 and get the answer - 8 100 000 000 000

There is a trick because when you multiply by 10 (or its multiples) you are simply multiplying by 1 times 10 and multiplying by 1 does not make a difference. So if you have $20 * 38$ you multiply 38 by the 2 in 20 and add a 0 at the back. $2 * 38 = 76$ and you add a 0 and get $760$ .

$9,000,000 = 9 * 10^6$ we ignore $9 = 3 ^2$ because it unnecesarily complicates things.

$900,000 = 9 * 10^5$ again we ignore $9=3^2$

$9,000,000 * 900,000 = 9^{1+1} * 10^{6+5} = 8,100,000,000,000$