Answer :

Method to find the square of number ending with 5.

Suppose we have to find 45^{2}.

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

∴ 85^{2} = 7225

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<span lang="EN-USKerala Board Mathematics Part I

<span lang="EN-USKerala Board Mathematics Part I

<span lang="EN-USKerala Board Mathematics Part I

<span lang="EN-USKerala Board Mathematics Part I

<span lang="EN-USKerala Board Mathematics Part I

<span lang="EN-USKerala Board Mathematics Part I

<span lang="EN-USKerala Board Mathematics Part I

<span lang="EN-USKerala Board Mathematics Part I

<span lang="EN-USKerala Board Mathematics Part I

<span lang="EN-USKerala Board Mathematics Part I