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Chapter 3 L3-4 Notes: Estimating Sums & Differences

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Rounding Estimate by rounding each decimal to the nearest whole number, then add the digits. Example:60.7 + 68.5

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On Your Own… a. 49.59 + 16.22 = b. $41.59 - $19.72 = c. 2.33 + 4.88 + 5.88 =

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Front-End Estimation To use front-end estimation, add or subtract the front digits. (Front digits are digits before the decimal). Example: 34.6 + 55.3

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On Your Own… a. 22.35b. 5.45c. $37.92 - 11.14 + 0.57 - $21.62

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Clustering Estimate by rounding a group of close numbers to the same number. Example: 72.50 68.50 69.75 71.75 +

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On Your Own… a. 6.99 + 6.59 + 7.02 + 7.44 b. $3.33 + $3.45 + $2.78 + $ 2.99 c. 5.45 + 5.3948 + 4.7999

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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.

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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