Question

11. Which of the following is a perfect square?
a) 1057 b) 625 c) 7928 d) 64000
12. If 5278 is squared, then what will be at unit place?
13. What will be the number of zeros in square of 400?
14. What is the square root of 121?
15. What is the sum of first four odd natural numbers?
16. Without adding find the sum of 1 + 3 + 5 + 7 + 9 is
17. Which of the following is a perfect square ?
(a) 45 (b) 81 (c) 18
(d) 54
18. What will be the "one's digit" in the square of 1234?
19. Find the square of 125 containing 5 in its units place.
20. The following numbers are not perfect squares. Give
reason.
a) 222222
b) 64000

Answer 1

Answer:

11:-625 is a, perfect square of 25..

12:- 4

13:-1 (20)²= 400

14:-(121)²=14641

15:-1+3+5+7=16

16:-25

17:-81 is a perfect square of 9

18:-1234 will have 6 as the one's digit(26387)² will have 9 as the one's digit

19:-(125)²=15625