There is no good reason. There are times when you would and times when you would not.
199 over 198 estimate = 1 actual answer would be greater than 1 35 over 17 estimate = 1 actual answer would be greater than 1
If you were a car mechanic and your actual amount came in lower than the estimate, your customer would think he or she got a good deal.
An upper bound estimate is a estimate that is greater than the actual solution.
67.125
When you round both factors in a multiplication problem up, your estimate will be greater than the actual product.
An estimate for the quotient of a division problem is sometimes less than the actual quotient. This occurs when the divisor is rounded down or when the dividend is rounded down, which can lead to a smaller estimate. Conversely, if the divisor is rounded up or the dividend is rounded up, the estimate could be greater than the actual quotient. Thus, the relationship between the estimate and the actual quotient depends on how the numbers are rounded.
An estimate for the quotient of a division problem involving decimals is sometimes less than the actual quotient. This can occur when rounding the dividend or divisor down, which may lead to a smaller estimated result. However, if rounding leads to higher values, the estimate could be greater than or equal to the actual quotient. Therefore, the relationship between the estimate and the actual quotient depends on the specific numbers and how they are rounded.
An actual measurement is going to be more accurate than an estimate.
over-estimate
over estimate
67.125
When the actual answer is not a solution that can be applied in real life and a higher number is required. For example, consider the number of coaches required to transport 60 children when each coach can take 40. The actual answer is 1.5 but you cannot get 1.5 coaches so the real-world answer is 2.