Question

18. Find the square root of 169 by the method of repeated subtraction.

19. Find the square root of the following by prime factorisation

a. 1764 b. 9604 c. 7744

20. Find the square root of the following by Division method.

a. 2304 b. 4489 c. 3136

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Answer 1

169 - 1 =168 168 - 3 = 165 165-5 = 160 160-7=153 153-9=144 144-11=133

133-13=120 120-15= 105

105-17=88

244

88-19 =69

69-21=48

48-23=25

25 since it is completely subtracted at 13th time .. square root of 169 is 13