Since the number is 631, and you want to round it to the hundred's place, you have to look at the ten's place. The number in the ten's place is 3, so you round down. The rules are rounding are:
1. numbers 1~4 round down
2. numbers 5~9 round up
This number, 631, would round to 600.
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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 .
1648 rounded to the nearest hundred is 1600.