Q1 of 50 Page 6

Which of the following numbers are perfect squares? 11, 12, 16, 32, 36

11 is not a perfect square because it is a prime number.
12 is not a perfect square because its units digit is 2.
16 is a perfect square because 16 = 4 x 4. 
32 is not a perfect square because its units digit is 2.
36 is a perfect square because 36 = 6 x 6.

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2 Which of the following perfect squares are squares of even numbers? 121, 225, 256, 1296, 6561 3 Which of the following numbers are perfect squares? 100, 1000, 330550, 12345600000 4 Write down the correct number in the box: [For every natural number n, we have
(n + 1)2 - n2 = (n + 1 - n)(n + 1 + n) = (n + 1) + n.]
(a) 232 - 222 = ________
(b) 1012 -1002 = _________
(c) 5512 - 5502 = __________ 5 Write down the correct number in each box:
(a) 652 = 6 x 7(100) + 52 = 4200 + 25 =_________
(b) 752 = 7 x 8(100) + 52 = 5600 + 25 =__________