48.81 will round up to 49.
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I think you round it to the nearest whole number...
You see which tick is nearer to the point on the number line.
Anything between 16.5 and 17.49
You can't convert a number with decimals (or a fraction) to a whole number, without losing precision. You can round it to the nearest number, or truncate it (just remove the decimals), but in any case, that won't be the same number (just the nearest integer, in case you choose to round it), so "2.8 as a whole number" really doesn't exist.