Question

Calculate the square of 201.

(a) 40401

(b) 39393

(c) 40426

(d) 41042

The question was asked during an interview.

I'm obligated to ask this question of Finding the Square of a Number in division Squares and Square Roots of Mathematics – Class 8

Answer 1

Correct option is (a) 40401

For explanation I would say: In the multiple choice question student can eliminate three options by mere observation. The student should notice that option 41042 contains 2 in its unit place so it cannot be a square of number ending with 1. Similarly, the other two options 39393 & 40426 ending with 3 and 6 whereas square of numbers ending with 1 have only 1 in its unit place.