463 rounded to the nearest hundred would be 500. Normally if a number is past the halfway mark between hundreds (in this case, if it's past 450) you round up. If not, you round down. If your number is exactly at the halfway mark (i.e. 450 exactly) you normally still round up.
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123
Round to the nearest hundred. 3,653
1700 → 1700 to the nearest hundred.
To the nearest hundredth: 1.06 To the nearest hundred: Zero
The hundred that is nearest to 202 is 200 .