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how to find square root
no:. 1 2 3 4 5 6 7 8 9
last digit of square:.1 4 9 6 5 6 9 4 1
1,9--- 1
2,8--- 4
3,7--- 9 and 5 is 5
(1)324/361
324 =last digit is4 so square root of 324 is 8,2 choose only one number
8 or 18 or 28.....
8×8=64
18×18=324
361=last digit is 1 so square root of 361 is 1, 9 choose only one number
9 or 19......
9×9=81,19×19=361
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