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First 9 X 10 is easy to calculate. Any number times 10 is that number with a 0 added.


9 X 10 = 90


Then you just add the 9 to it to have the same answer as if you multiplied 9 X 11.


90 + 9 = 99


or


9 X 11 = 99

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15y ago
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Q: How 9 x 10 can help you find 9 x 11?
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