The nearest 100th is 800. You should round down not up. If you want to round up it would be 900.
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You round it up to 1000.
You round up to 100.
What is the nearest 100 of 450
You round up to 100,000.
To round to nearest hundred, look at the tens digit: if it is 5 or more round up otherwise round down; 2 is not 5 or more, so round down: 5921 → 5900 to the nearest hundred.