Question

what smallest number should be subtracted from 1240 to make it a perfect square

Answer 1

example

First we have to find the square root of 16800 by long Division method.

[Solution is in the attachment]

This shows that (129)² is less than 16800 by 159, So the least number to be subtracted from 16800 is 159.

Required perfect Square number= 16800- 159= 16641

√16641 = 129

Hence , the required this number is 159.

Answer 2

1225 is square of 35
We should subtract 15 from 1240 to make it a perfect square