Square of a number

Square of a number 

Square of a number can find in so many ways. But the important one is base method as it is multiplication with same number.

I will discuss here two methods i.e. 

1. Special case method

2. Base method

1. Special case method : 

    Rule : This method is applicable only when one's place digit is 5.

 

    As you know 5² = 25
    15² = 1x2 / 25 = 225

So steps are as follows.

Step 1 :  First two digits from right to left is 25

Step 2 :  Ten's digit x (Ten's digt + 1)

15 x 15 =  1x2 / 25 = 225
25 x 25 =  2x3 / 25 = 625
35 x 35 =  3x4 / 25 = 1225
45 x 45 =  4x5 / 25 = 2025
55 x 55 =  5x6 / 25 = 3025
65 x 65 =  6x7 / 25 = 4225
75 x 75 =  7x8 / 25 = 5625
85 x 85 =  8x9 / 25 = 7225
95 x 95 = ?

Very easy. Isn't it?

Next We will look into base method