Here is an explanation for multiplying by 9. Put thumbs together. Start counting from left pinky, and stop when you get to the number you are multiplying by nine. Bend that finger. Numbers to the left of the bent finger are tens, and the numbers to the right of the bent finger are ones. This is a picture of two hands side by side: ||||/ \|||| Here is another picture, but the period represents a bent finger for 9x3 ||.|/ \||||
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