Question

what should be subtracted from 1,340 to make it perfect square?

Answer 1

Let us find square root of 1340
√1340=36.6
As we can see that 1340 is not a perfect square. The nearest perfect square to 1340 which is smaller than it should be (36)²=1296.
1340-1296=44.
Therefore, 44 must be subtracted from 1340 to make it a perfect square.