Without doing any calculation, find the numbers which are surely not perfect squares :

CBSE Class 8 CBSE Class 8 Maths
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1

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

2

We know that a number ending with 2, 3, 7 or 8 is never a perfect square.
Therefore,
(i) 153 is not a perfect square.
(ii) 257 is not a perfect square.
(iii) 408 is not a perfect square.
(iv) 441 may be a perfect square.
So, 153, 257 and 408 are surely not perfect squares.