Question

If the digit in the units place of the perfect square is 4, what digits are there in the units place of the
square root?

Answer 1

The unit digit of a perfect square can be only 0, 1, 4, 5, 6 or 9. The square of a number having: 1 or 9 at the units place ends in 1. 2 or 8 at the units place ends in 4.