599, 555, 550, 551, 578...
any number greater than or equal to 550 and any number less than or equal to 600
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600
600
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.
Rounded to the nearest hundred, these numbers are approximately equal to: 600 600 700 800