400
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406 rounded to the nearest hundred would be 400. When rounding a number to the nearest hundred, you look at the digit in the tens place. If it is 5 or greater, you round up; if it is less than 5, you round down. In this case, the digit in the tens place is 0, so we round down to the nearest hundred, which is 400.
Honey, 406 rounded to the nearest hundred is 400. You're not trying to reinvent the wheel here, just drop those extra digits and keep it simple.