[Speed Math] MULTIPLYING A NUMBER ENDING WITH 5

Here’s an example of a SPEED MATH shortcut for Multiplying a Number ending with 5: (Mul) NxM(LD5) from the MULTIPLICATION category.

When can I use this method?

Although this can be used for multiplying any number with another number whose last digit is = 5, it is better suited for 2 or 3-digit numbers. Larger numbers could get increasingly difficult to multiply with this method.

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Download Practice sheet for MULTIPLYING A NUMBER ENDING WITH 5

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Notes –

1. This method uses the concept of doubling one number and halving another thereby not affecting the end product.
2. Always double the number whose last digit = 5.
3. While halving an odd number, make sure to put the decimal.

Related Shortcuts –

Multiplying a Number ending with 1: (Mul) NxM(LD1)
Multiplying a Number ending with 9: (Mul) NxM(LD9)
Multiplying Numbers using Aliquot Method: Mul) NxM(Aq)

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