# What number is to be subtracted from 0.006898 to make it a perfect square ?

What number is to be subtracted from 0.006898 to make it a perfect square ?

A. 0.000008

B. 0.000007

C. 0.000009

D. 0.000006

**Answer : **C. 0.000009

## Explanation:

Subtract 0.000009 from 0.006898

= 0.006898 - 0.000009

= 0.006889

Square root of 0.006889 = 0.083

= 0.083 is a perfect square