However, when you use rounding to help you multiply or divide numbers, it’s usually better to round the numbers so they each have only one or two digits that are not 0. Estimate the length of the mode...However, when you use rounding to help you multiply or divide numbers, it’s usually better to round the numbers so they each have only one or two digits that are not 0. Estimate the length of the model, then use a calculator to find the actual length of the model. When rounding the values to be added, subtracted, multiplied, or divided, it helps to round to numbers that are easy to work with.
