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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 ...
Put down the last digit of the number on the right-most side of the answer, like the image shows.
Add the second last digit of the number you want to multiply with the last digit. If the number you have is more than 10, do not add ...
Do the same thing on step 2 and add the third last digit and the second last digit together, and so on, until you reach the first digit. ...
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