the least number which should be subtracted from 10420 to make it perfect square is:
a> 189
b> 16
c> 256
d> 164
e> 36
?
a> 189
b> 16
c> 256
d> 164
e> 36
?
If you can see that 100^2 = 10,000, then the nearest square to 10420 is going to be just larger than 100^2. You might try guessing it's 102^2 to see if you get something close to 10420. To compute this quickly:tarun'susername wrote:the least number which should be subtracted from 10420 to make it perfect square is:
a> 189
b> 16
c> 256
d> 164
e> 36
?
102^2 = 102*102 = (100 + 2)*102 = 10200 + 204 = 10404
which is 16 less than 10420.
