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Mental Math Tricks by Kevin OConnor - HTML preview

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Multiplying by 11 shortcut

This technique teaches you how to multiply any number by eleven, easily and quickly. We will take a few examples and from these you will see the pattern used and also how easy they are to do.

So, to begin let’s try 12 time 11.

 

First things first you will ignore the 11 for the moment and concentrate on the 12. Split the twelve apart, like so: