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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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
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