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You can do this in several ways. You can round to the nearest decimal; you can also round up, or round down.
5%
To round 3.5 to one decimal place, you would look at the digit immediately following the decimal point, which is 5 in this case. Since 5 is equal to or greater than 5, you would round up. Therefore, 3.5 rounded to one decimal place would be 3.6.
53.8 to one decimal point is 53.8. When rounding a number to one decimal point, you look at the digit immediately to the right of the decimal point. If that digit is 5 or greater, you round up; if it is less than 5, you round down. In this case, the digit after the decimal point is 8, so we round up to 53.8.
19.05 rounded to one decimal place is 19.1. Numbers above 5 (inclusive) round up, numbers below round down. To be accurate do not round unnecessarily.