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Mental Math Tricks

Page 3 of 18
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:
1
2
Add these two digits together 1 + 2 = 3
1+2 = 3
Place the answer, 3 in between the 12 to give 132
11 X 12 = 132
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