If you round it to the nearest 10, then it rounds up to 30.
If you round it to the nearest 100, 1000 etc it rounds down to 0.
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If I think your asking the question how I think your asking it, then any number 5 and above you round up. If its below 5 you round down. :-)
The nearest 100th is 800. You should round down not up. If you want to round up it would be 900.
98 would round up to 100.
You do not need a calculator to round. You either round down or round up. Example 3.66 can be rounded UP to 4 or 3.64 rounded down to 3
As it ends with a five, it will round up, so 30 is the nearest 10.