When can I use this method?
For squaring numbers near 100.
The number can be either < or > 100.
One can use this method to square numbers away from 100 as long as it is comfortable to square the difference portions.
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- This method uses the concept (100 + a)2 = [(100 + a) + a] + a2, where ‘(100 + a)’ is the number near 100 and ‘a’ is the difference.
- Whenever the number is more than 100, the difference is written as positive (+ve).
- Whenever the number is less than 100, the difference is written as negative (-ve).
- This method is a corollary to the Multiplication method Nr100
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