Explain why √(89) must be between 9 & 10

Question

Explain why
`√(89)` must be between 9 & 10

Answer 1

`√(81)=9 \\ √(100)=10`

The square root of 81 is 9, the square root of 100 is 10. 89 is between 81 and 100, therefore the square root of 89 must be between 9 and 10.