[Speed Math] MULTIPLYING NUMBERS NEAR 100

Here’s an example of a SPEED MATH shortcut for MULTIPLYING NUMBERS NEAR 100 : (Mul) Nr100 from the MULTIPLICATION category.

When can I use this method?

For multiplying numbers near 100. The numbers can be either more than 100 or less than 100 or a combination of the two.

You may also use this method to multiply numbers a little farther away from 100 as long as their differences from 100 are easy to multiply.

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Download Practice sheet for  MULTIPLYING NUMBERS NEAR 100

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Notes –

1. This method uses the concept (100 + a) (100 + b) = [(100 + a) + b] + ab or [(100 + b) + a] + ab, where ‘(100 + a)’ and ‘(100 + b)’ are numbers near 100 and ‘a’ and ‘b’ are the respective differences.
2. Whenever the number is more than 100, the difference is written as positive (+ve).
3. Whenever the number is less than 100, the difference is written as negative (-ve).
4. When both numbers are either less or more than 100, you add the product of differences.
5. When one number is more than 100 and another less than 100, you subtract the product of differences.

Related Shortcuts –

Multiplying Numbers near 10: (Mul) Nr10
Multiplying Numbers near 1000: (Mul) Nr1000

 

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