Question

The ending digit of the square of a number whose unit digit is 5, is ___ .

• A. 0
• B. 5
• C. 6
• D. 9

Answer 1

The correct option is B 5

If the units digit of a number is '5', then the square of that number ends with '5'.

For example, $5^2=25$, ${15}^2=225$, ${25}^2=625$, ${35}^2=1225$ etc. all ends with the digit '5'.