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Q.

Find the square root of 100 and 169 by the method of repeated subtraction.


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a

10,13

b

11,15

c

13,17

d

None of these 

answer is A.

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Detailed Solution

Concept: method of repeated subtraction: continuously subtract a number from a large number until the number become zero or less than the actual number
Given, Square root of 100 and 169,
100−1=99
99−3=96
96−5=91
91−7=84
84−9=75
75−11=64
64−13=51
51−15=36
36−17=19
19−19=0
Square root of 100,  100=10
Square root of 169,
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
88−19=69
69−21=48
48−23=25
25−25=0
Square root of 169=  169=13
Hence, the correct option is 1
 
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