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Multiplication Multiplying Numbers near 1000 Speed Math

[Speed Math] MULTIPLYING NUMBERS NEAR 1000

Here’s an example of a SPEED MATH shortcut for MULTIPLYING NUMBERS NEAR 1000 : (Mul) Nr1000 from the MULTIPLICATION category.

Multiplying Numbers near 1000

When can I use this method?

For multiplying numbers near 1000. The numbers can be either more than 1000 or less than 1000 or a combination of the two.

You may also use this method to multiply numbers a little farther away from 1000 as long as their differences from 1000 are easy to multiply.

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pdf Download Practice sheet for  MULTIPLYING NUMBERS NEAR 1000

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Notes –

  1. This method uses the concept (1000 + a) (1000 + b) = [(1000 + a) + b] + ab or [(1000 + b) + a] + ab, where ‘(1000 + a)’ and ‘(1000 + b)’ are numbers near 1000 and ‘a’ and ‘b’ are the respective differences.
  2. Whenever the number is more than 1000, the difference is written as positive (+ve).
  3. Whenever the number is less than 1000, the difference is written as negative (-ve).
  4. When both numbers are either less or more than 1000, you add the product of differences.
  5. When one number is more than 1000 and another less than 1000, you subtract the product of differences.

Related Shortcuts –

Multiplying Numbers near 10: (Mul) Nr10
Multiplying Numbers near 100: (Mul) Nr100

 

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One reply on “[Speed Math] MULTIPLYING NUMBERS NEAR 1000”

How to solve this sum using this technique – MULTIPLYING ANY NUMBERS NEAR 1000
899 x 1018 = 915182 1
here we have to multiply (-101) x (+18 )
which is time taking

What to do ?

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