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To round 78.3109 to the nearest thousandth, you would look at the digit in the thousandths place, which is the 1 in this case. Since the digit to the right of 1 is less than 5, you would keep the 1 as it is. Therefore, rounding 78.3109 to the nearest thousandth would result in 78.311.

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Q: How do you round 78.3109 to the nearest thousandth do you know?
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