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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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Categories
Multiplication Multiplying Numbers with last digit sum 100 Speed Math

[Speed Math] MULTIPLYING NUMBERS WITH LAST DIGIT SUM 100

Here’s an example of a SPEED MATH shortcut for MULTIPLYING NUMBERS WITH LAST DIGIT SUM 100: (Mul) S100dx from the MULTIPLICATION category.

Multiplying Numbers with last digit sum 100

When can I use this method?

For multiplying any 3-digit number with another 3-digit number such that the sum of the last 2 digits of the multiplier and multiplicand = 100 and the remaining digits of multiplier are same as that of the multiplicand.

For multiplying any 3-digit number with another 3-digit number such that the sum of the last 2 digits of the multiplier and multiplicand = 100 and the remaining digits of multiplier are same as that of the multiplicand.

You cannot use this method to multiply numbers with unequal number of digits, i.e. multiplying a 3-digit number with a 4-digit number.

 

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pdf Download Practice sheet for MULTIPLYING NUMBERS WITH LAST DIGIT SUM 100

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Notes –

  1. The RHS of the answer should always be written in 4-digit form by prefixing zero(s), if the value is less than 4-digit, e.g. write ‘9’ as ‘0009’ or ’21 as ‘0021’ or ‘121’ as ‘0121’.

Related Shortcuts –

Multiplying Numbers with last digit sum 10: (Mul) S10dx
Multiplying Numbers with last digit sum 1000: (Mul) S1000dx

 

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