A decimal is a number, while an inch is a unit of length. The two are not directly related, and this question cannot be answered as such.
If the decimal number were inches, however, it would be sufficient to round to the nearest integer. If, for instance, they were feet, it would be best to multiply by 12, round to the nearest integer, and then divide by 12.
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840.01
Round to the nearest decimal
when rounded to the nearest tnth,which decimal round to 3.8
The decimals of: 34.5, 34.6, 34.7, 34.8 and 34.9 all round up to 35
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