Question

What will be the ones digit in the squares of the following numbers?

(i) 36
(ii) 252
(iii) 543

Answer 1

(i) If a number ends with 6, its square ends with 6.

∴ Ones’ digit in the square of 36 is 6.

(ii) If a number ends with 2, its square ends with 4.

∴ Ones’ digit in the square of 252 is 4

(iii) If a number ends with 3, its square ends with 9.

∴ Ones’ digit in the square of 543 is 9.