Question:
A number ending in 9 will have the unit’s place of its square as
(a) 3
(b) 9
(c) 1
(d) 6
Solution:
(c) We know that, if a number is ending in 1 or 9 in the unit's place, then its square ends in 1 .
The number ending in 9 , will have the unit's place of its square as 1 . $[\because 9 \times 9=81]$