Question

Answer the following questions:

(i) What will be the unit digit of the square of 24?
(ii) What will be the unit digit of square of 67?

Answer 1

(i) Given number is 24.

24 has 4 in its units place.

$4^2=4\times 4=16$ Unit’s place of 16 is 6.

Therefore, 24 will have 6 in its units place.

$\text{[Verification,}{24}^2=576\to \text{has 6 at its units place.]}$

(ii) Since 67 has 7 at its units place and the square of 7 is 49. Hence, the square of 67 will have 9 at its units place.

$\text{[Verification}{67}^2=4489\to \text{has 9 at its units place.]}$