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Rounding isn't necessary. The distributive property tells you that 13 x 9 = 90 + 27 = 117

If you have to, you could estimate that 10 x 10 = 100

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8y ago

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You do not need to estimate multiplication by 9. 13*9 = 117.

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8y ago
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Q: How can you use rounding to estimate 13 x 9?
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