It depends on whether you are rounding to the nearest integer, nearest 10, nearest 50 etc.
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The smallest whole number that can be rounded to 500 is 450.
450
You do nothing. 450 is already rounded to the nearest ten.
When rounding a number, you look at the digit to the right of the place value you are rounding to. In this case, 450 is being rounded to the nearest ten. The digit in the tens place is 5, which is greater than 4, so you would round up. Therefore, 450 rounded to the nearest ten is 450.
Because 450 is nearer to zero than it is to 1,000.