Estimation skills are valuable, time-saving tools particularly in practical situations when exact answers are not required or needed.
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Estimation keeps the focus on the meaning of the numbers and operations, encourages reflective thinking, and helps build informal number sense with fractions. Students can reason with benchmarks to get an estimate without using an algorithm. Estimation can be used to check the reasonableness of an answer.
Use estimation to check the reasonableness of a sum or difference.
Refine estimates by adjusting the final amount, using terms such as closer to, between, and a little more than. (b, c)
Round whole numbers expressed through millions to the nearest thousand, ten thousand, and hundred thousand place. (c)
Number lines are tools that can be used in developing a conceptual understanding of rounding decimals. One strategy includes creating a number line that shows the decimal that is to be rounded. Locate it on the number line. Next, determine the closest multiples of whole numbers, tenths, or hundredth, it is between. Then, identify to which it is closer.