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it makes it easier when u round
Some people find it easier to add or subtract whole numbers but yes, you could round to the nearest half.
If the fraction is less than half, round down. If the fraction is half or greater, round up.
The estimated answer for 308 would be 300. When estimating, you round the number to the nearest place value you are estimating for. In this case, we are estimating to the nearest hundred, so we look at the hundreds place digit (3) and drop the tens and ones digits. Therefore, the estimated answer for 308 is 300.
If it is a 3 or more dugit number, it is easier to round of to 100. The reason is that we can directly replace the last 2 digits by zero.