# By repeated subtraction of odd numbers starting from 1, find whether the following numbers are perfect squares or not? If the number is a perfect square then find its square root.(iv) 49

We have $\sqrt{49}$ . Then

49 - 1 =  48

48 - 3 = 45

45 - 5 = 40

40 - 7 = 33

33 - 9 = 24

24 - 11 = 13

13 - 13 = 0 .

We get zero on the 7th step so $\sqrt{49} = 7$

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