Question

3.
Which of the following numbers are perfect squares?
100, 205000, 3610000, 212300000​

Answer 1

$100 = {10}^{2}$

$3610000 = {1900}^{2}$

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Answer 2

Answer:

A number to be a perfect square should have even number of zeroes in the end

100 = 2 zeroes

hence , a perfect square

205000 = 3 zeroes

hence, not a perfect square

3610000 = 4 zeroes

hence, a perfect square

212300000 = 5 zeroes

hence, not a perfect square

NOTE - this is only applicable in numbers having zeroes in the end