Question

The square of a number having 1 in its ones place will always have ____ in its ones place.

• A. 1
• B. 2
• C. 3
• D. 0.0

Answer 1

The correct option is A 1

$1\times 1=1$
$11\times 11=121$
$131\times 131=17,161$
$1811\times 1811=32,79,721$

We see that unit digit is 1.

$\Rightarrow$The square of a number having 1 in its ones place will always have 1 in its ones place.