Question

Q. Without doing any calculation, find the numbers which are surely not perfect squares:
(i) 153
(ii) 257
(ii) 408
(iv) 441. (explain)
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Answer 1

Answer:

We know that the ending digit ofperfect square is 0, 1, 4, 5, 6, and 9. ∴ A number ending in 2, 3, 7 or 8 can never be a perfect square. ∴ (i) 153, cannot be a perfect square. (ii) 257, cannot be a perfect square.