138
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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
It is - if you use appropriate rounding. Rounding does not have to be to whole numbers.
331, 776 or just use a calculator
Rounding, you see the number and just make it look neater or easier to use. Estimating, you guess a number.
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