Question

What is the least number which should be subtracted from $0.000326$ to make it a perfect square?

• A. $0.000002$
• B. $0.000004$
• C. $0.02$
• D. $0.04$

Answer 1

Answer: (A)

$0.000002$

The given number is $0.000326=326\times {10}^{-6}$

$326=18\times 18+2$

$\therefore 326-2$ is a square number.

$\therefore$ $2\times {10}^{-6}=0.000002$ should be subtracted from $326\times {10}^{-6}$.