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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7 cm to the nearest hundredths is 7.00cm
70
56.199 rounded to the nearest tenth is 56.2. When rounding to the nearest tenth, you look at the digit in the hundredths place, which is 9 in this case. Since 9 is 5 or greater, you round up the digit in the tenths place, which is 6, making it 7. Therefore, 56.199 rounded to the nearest tenth is 56.2.
1/7 to the nearest thousand = zero 1/7 to the nearest thousandth = 0.143
7