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Multiplication Multiplying a Number ending with 9 Speed Math

[Speed Math] MULTIPLYING A NUMBER ENDING WITH 9

Here’s an example of a SPEED MATH shortcut for Multiplying a Number ending with 9: (Mul) NxM(LD9) from the MULTIPLICATION category.

Multiplying a Number ending with 9

When can I use this method?

Although this can be used for multiplying any number with another number whose last digit is = 9, 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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pdf Download Practice sheet for MULTIPLYING A NUMBER ENDING WITH 9

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Notes –

  1. This method uses the concept a x (b-1) = ab – a

Related Shortcuts –

Multiplying a Number ending with 1: (Mul) NxM(LD1)

Multiplying a Number ending with 5:(Mul) NxM(LD5)

Multiplying Numbers using Aliquot Method: Mul) NxM(Aq)

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