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to multiply a number by 9, the numbers in your answers add up to 9. Here's a pattern:

9*1=9 9+0=9

9*2=18 1+8=9

9*3=27 2+7=9.

When we get to 9*11, we get 99. 9+9=18, 1+8=9. The rule still applies to 99.

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12y ago

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