Question

The square root of 387 must be a number between what two numbers?

Answer 1

`19 < sqrt387 <20`

Explanation:

It helps to know the squares of the first 20 natural numbers by heart.

`20^2 = 400` which is not very far from 357.

`19^2 = 361`

`387 " is between " 361 and 400`

`361 < 387 <400`

`19 < sqrt387 <20`