Squaring numbers more than 100

This technique is suitable for finding the square of number that is more than 100.

Example 1:

103 x 103 = 10609



Steps:

Find the difference between 100 and the number. 103 - 100 = 3

1. 103 + 3 = 106(00) <- Add the difference from the number being squared.


2. 3 x 3 = 9 <- Square the difference.


3. 10600 + 9 = 10609.

Example 2:

112 x 112 = 12544

Steps:
Find the difference between 100 and the number. 112 - 100 = 12

1. 112 + 12 = 124(00) <- Add the difference from the number being squared.


2. 12 x 12 = 144 <- Square the difference.


3. 12400 + 144 = 12544.

If you have better method to share, please don’t hesitate to leave your comment.