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Impossible to say. What you have is a measurement in whole centimeters. Those are bigger than tenths of centimeters. A less accurate measurement. And you can't make a more accurate measurement out of a less accurate one. The other way is fine though. Measured with tenths, anything between 6.6 - 7.4 cm could be written as 7 cm according to the laws of rounding.

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9y ago

What else can I help you with?