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Multiplication Multiplying Numbers ending in 5 Speed Math

[Speed Math] MULTIPLYING NUMBERS ENDING IN 5

Here’s an example of a SPEED MATH shortcut for MULTIPLYING NUMBERS ENDING IN 5 : (Mul) LD5 from the MULTIPLICATION category.

Multiplying Numbers ending in 5

When can I use this method?

For multiplying any 2-digit number with another 2-digit number such that the last digit of the multiplier and multiplicand is = 5. The first digits can be different.

For multiplying any 3-digit number with another 3-digit number such that the last digit of the multiplier and multiplicand is = 5. The initial 2 digits can be different.

You can also use this method to multiply numbers with unequal number of digits, i.e. multiplying a 2-digit number with a 3-digit number such that the last digit of the multiplier and multiplicand is = 5.

As long as finding the product of initial digits is easy enough, one can use this method to multiply numbers bigger than 2 or 3-digits.

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pdf Download Practice sheet for MULTIPLYING NUMBERS ENDING IN 5

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Notes –

  1. When the average of the initial digits is an integer, the last 2 digits of the answer is = 25.
  2. When the average of the initial digits is in decimal, the last 2 digits of the answer is = 75.
  3. If the average of the initial digits is an integer, simply appending 25 to the sum of product and average of the initial digits gives you the answer.

Related Shortcuts –

“None”

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