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the product of x9 is always the # being multiplied less than if multipliedby 10.

example

10 x 5= 50

9 x5 = 45 or 5 less than 50

10 x 10 =100

9x10 = 90, or 10 less than 100

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Q: How do you use a 10 fact to find a 9 fact?
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