The answer depends on the degree to which the number needs to be rounded.
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Question: How to round a number? Answer: if the number is 4 or below you round down if it's 5 or above you round up.
When you round the 9 in the number 9.84 it will round up to the number 10.
I think you can round a single number?
You round off the number 16 to the nearest ten by rounding up to 20. You look at the number to the right of the number you want to round, if it is a 5 or above you round up and if it is a 4 or under you round down.