Q. 2 C

Given below is a method to calculate 372?

Find an easy method to compute squares of number ending in 5.

Answer :

Method to find the square of number ending with 5.

Suppose we have to find 452.

Let the number at tens place be x.

So, we first have to find x(x+1).

For example, here we have x=4.

So, x(x+1) = 4(4+1) = 4×5 = 20

Now, we just need to write this 20 before 25, i.e. 2025 and it is the required square.

Let us now find the square of 85.

So, 8(8+1) = 8×9 = 72

852 = 7225

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