Learn to quickly multiply by 11
Basically, you write out the two numbers with space and then add the two numbers you are multiplying together for the middle term.
If after adding the two digits together and the number is greater than 1 carry the ten to the left.
Watch the examples of multiplying by 11 to see exactly what to do.
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Math Trick Multiplying by 11 Quickly and Easily https://www.youtube.com/watch?v=sLycwWuz4QQ
Times table Trick (Elevens) - Fast Mental Multiplication Math Trick https://www.youtube.com/watch?v=_HrHUUWtsbE
Math Made Easy Playlist
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