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


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