Question

What is the square roots of a three digit number ending with one?

(a) 1

(b) 11

(c) 121

(d) 9

I had been asked this question in semester exam.

My question comes from Finding Square Roots topic in section Squares and Square Roots of Mathematics – Class 8

Answer 1

Correct option is (b) 11

To elaborate: If a three digit number which is ending with 1 the square root would be ending with 1 or 9. Here all the options either have 9 or 1 at the ending. The option which has 1 cannot be the answer since the square wouldn’t be a three digit number. Similarly with the options 121 and 9 their square won’t be three digit numbers either. So, the correct answer will be 11, the square of 11 is a three digit number and ends with 1.