# What is the square root of 7921?

Mar 20, 2018

89

#### Explanation:

What's the bigger perfect square minor than 7921?
is 64.
The square root will start by a 8 ($\sqrt{64}$)

1) Subract 6400 from 7921 and you obtain 1521.

2)take 8 multiply it by 20 and add find the larger number

$\overline{16 n} \times n$ smaller or equal than 1521. $169 \times 9$ is exactly 9

3) so the solution is 89