Question

What will be the unit digit of the squares of the following numbers ?

i) 81

ii) 272 [2 MARKS]

Answer 1

Concept : 0.5 Mark
Application : 0.5 Mark
Answers : 1 Mark

i) Unit's digit of 81 is 1. So the units digit of its square is also 1 as unit digit of square of numbers ending in 1 or 9 is 1.

ii) Unit's digit of 272 is 2. So the units digit of its square is 4.