400
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To round 391 to the nearest hundred, we look at the digit in the tens place, which is 9. Since 9 is greater than or equal to 5, we round up. Therefore, 391 rounded to the nearest hundred is 400.
Well, darling, 391 rounded to the nearest hundred is 400. It's not rocket science, just basic math. So there you have it, 391 gets a little makeover and becomes 400.