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Sometimes it is advantageous to express a value in round numbers. To round to a particular place, look at the digit immediately to the right of the one you want to round to. If that digit is 4, 3, 2, 1 or 0, zero it and everything to the right of it out. If that digit is 5, 6, 7, 8 or 9, increase your target digit by one and zero everything to the right of it out.

Since the number to the right of the 1 is a 9, increase the 1 to 2 and zero everything else out. 199 rounds up to 200.

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10y ago

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Q: Why does 199 round to 200?
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