Estimating Decimals Textbook page 96. What is clustering? Clustering means rounding the numbers to the same value. The numbers 18, 21, and 19 are all.

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Presentation transcript:

Estimating Decimals Textbook page 96

What is clustering? Clustering means rounding the numbers to the same value. The numbers 18, 21, and 19 are all close to 20. To find the sum we could estimate:

Example 1: Estimate the sum of the numbers [Clustering means rounding the numbers to the same value.] To find the sum we could estimate:

Example 2: Estimate by rounding to the indicated place value. (A) ; ones (B) – 5.039; hundredths line up the decimals

Example 3: Estimate by using compatible numbers. (A)26.76 x x 3 75 (B) ÷ ÷ 15 3

What is front-end estimation? Example 4: Estimate using front- end estimation. Front-end estimation means to use only the whole number part of the decimal