Rounding and Estimation
This lesson explains how to round off numbers.
• To be able to round numbers up and down to the nearest ten, the nearest whole number, or the nearest decimal.
Rounding numbers makes numbers that are easier to work with. When numbers are rounded up or down, the numbers used are only approximates. They are not exact numbers. An exact number cannot generally be obtained using numbers that have been rounded. Rounding numbers will get an answer that is close, but not exact.
There are many ways of round numbers. You can round off to the nearest ten, the nearest whole number, the nearest first decimal, and so on.