Question

Square of a number ending with 1 or 9 will always have unit digit as 1.

• A. True
• B. False

Answer 1

The correct option is A

True

$1\times 1=1$
$9\times 9=81$
$11\times 11=121$
$19\times 19=361$
Hence, we can see that square of number ending with 1 or 9 will always have unit digit as 1.