It's not necessary.
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It could be. 5.7 to the nearest cm is 6.
6.2cm= how many inches
a sum is the answer of the question you rounded from
I see no reason for rounding it.
Numbers that end in a digit of 4 or less should be rounded DOWN to the nearest ten.Example: 24 rounded to the nearest ten would be 20Numbers that end in a digit of 5 or more should be rounded UP to the nearest ten.Example: 28 rounded to the nearest ten would be 30