Here’s an example of a SPEED MATH shortcut for Multiplying a Number ending with 9: (Mul) NxM(LD9) 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 = 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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- This method uses the concept a x (b-1) = ab – a
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