What is the least number which should be subtracted from

Home » Aptitude » Simplification » Question

What is the least number which should be subtracted from 0.000326, to have perfect square ?

1. 0.000004
2. 0.000002
3. 0.04
4. 0.02

Correct Option: B

The given number has 6 decimal places.
Now,

i.e. 326 – 2 = 324 Which is a perfect square of 18.
Therefore, 0.000002 should be subtracted from 0.000326 to make it a perfect square of 0.018.