Question

Find the square of 25.

(a) 625

(b) 525

(c) 635

(d) 615

I have been asked this question by my college director while I was bunking the class.

This interesting question is from Finding the Square of a Number topic in division Squares and Square Roots of Mathematics – Class 8

Answer 1

The correct answer is (a) 625

Easiest explanation: There is a beautiful pattern followed by all the numbers ending with 5. We can get the square of any number ending with 5 without actually calculating it. All the numbers ending with 5 shows 25 at the end of their squares, and the other places can be filled by multiplying the next consecutive number. For example: 25^2 = (2×3)25 i.e.625 (the step shown is just for understanding).