That rounds to 5.
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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.
To round to the nearest integer, look at the first digit after the decimal point (the tenths digit): if it is less than 5 round down otherwise round up. The tenths digit of 4.8 is 8, so round up thus 4.8 → 5 when rounded to the nearest integer.
It depends on the degree to which it is rounded. To the nearest integer, it is 0.
Any integer is already rounded to the nearest fractional part.
The nearest hundredth is the same as two decimal places.