Question

By just observing the digits at ones place, tell which of the following can be
perfect squares and how?
1026, 1022, 1024, 1027​

Answer 1

Answer:

If the units digit of a number is 2, 3, 7 or 8, the number cannot be a whole square. (i) 1026 has 6 as the units digit, so it is possibly a perfect square. (ii) 1028 has 8 as the units digit, so it cannot be a perfect square. (iii) 1024 has 4 as the units digit, so it is possibly a perfect square.