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### Question

What is the least number that should be subtracted from 0.0604 to make it a perfect square?

**A**

0.06.

**B**

0.05.

**C**

0.04.

**D**

0.02.

**Soln.**

**Ans: a**

We know that 0.02 = $√0.0004$, so by inspection we can see that 0.0604 - 0.06 will give us 0.0004.