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Multiplication Multiplying Numbers near 10 Speed Math

[Speed Math] MULTIPLYING NUMBERS NEAR 10

Here’s an example of a SPEED MATH shortcut for MULTIPLYING NUMBERS NEAR 10 : (Mul) Nr10 from the MULTIPLICATION category.

Multiplying Numbers near 10

When can I use this method?

For multiplying numbers near 10. The numbers can be either more than 10 or less than 10 or a combination of the two.

You may also use this method to multiply numbers a little farther away from 10 as long as their differences from 10 are easy to multiply.

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pdf Download Practice sheet for MULTIPLYING NUMBERS NEAR 10

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Notes –

  1. This method uses the concept (10 + a) (10 + b) = [(10 + a) + b] + ab or [(10 + b) + a] + ab, where ‘(10 + a)’ and ‘(10 + b)’ are numbers near 10 and ‘a’ and ‘b’ are the respective differences.
  2. Whenever the number is more than 10, the difference is written as positive (+ve).
  3. Whenever the number is less than 10, the difference is written as negative (-ve).
  4. When both numbers are either less or more than 10, you add the product of differences.
  5. When one number is more than 10 and another less than 10, you subtract the product of differences.

Related Shortcuts –

Multiplying Numbers near 100: (Mul) Nr100
Multiplying Numbers near 1000: (Mul) Nr1000

 

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