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Picture of How to Multiply by 11 Quickly
Multiplying by numbers less than 11 is easy. However, using the fact that 11 = 10 + 1, there is a way to multiply by 11 quickly, in less than 15 seconds.

Step 1: Prepare To Add

Picture of Prepare To Add
Put down the last digit of the number on the right-most side of the answer, like the image shows.
 
repguy20202 years ago
Sweet!
cart5622 years ago
I actually do know a bit about the method pictured on the right of the main picture, but why do you have that when you are explaining a totally different method?
Peter112352 years ago
or just multiply by 10 and add the number ( 4370 +437 in this case) :-)