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
- 103 + 3 = 106(00) <- Add the difference from the number being squared.
- 3 x 3 = 9 <- Square the difference.
- 10600 + 9 = 10609.
Example 2:
112 x 112 = 12544
Steps:
Find the difference between 100 and the number. 112 – 100 = 12
- 112 + 12 = 124(00) <- Add the difference from the number being squared.
- 12 x 12 = 144 <- Square the difference.
- 12400 + 144 = 12544.
If you have better method to share, please don’t hesitate to leave your comment.
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