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

Since, all perfect square numbers contain their unit’s place digits 0, 1, 4, 5, 6 and 9.
(i) But given number 153 has its unit digit 3. So it is not a perfect square number.
(ii) Given number 257 has its unit digit 7. So it is not a perfect square number.
(iii) Given number 408 has its unit digit 8. So it is not a perfect square number.
(iv) Given number 441 has its unit digit 1. So it would be a perfect square number

Class 8 Maths Chapter 6 Exercise 6.3 Solution in Video

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