Look at the digit after the decimal point. If it is bigger than 5, then add one to the last digit BEFORE the decimal point otherwise don't add. Then delete the decimal point and everything after it.
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work out
To the nearest tenth, 77.5 To the nearest whole number, 78
I think you round it to the nearest whole number...
48.81 will round up to 49.
Yes if the number includes decimals