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Estimating Sum and Differences

Estimating Sum and Differences. September 9, 2009. Estimating. When numbers do not have the same number of digits. Round each number to the greatest place of the lesser number. Example: 5,824- 298 5, 8 00- 3 00= 5,500. Clustering.

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Estimating Sum and Differences

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  1. Estimating Sum and Differences September 9, 2009

  2. Estimating • When numbers do not have the same number of digits. Round each number to the greatest place of the lesser number. Example: 5,824- 298 5,800- 300= 5,500

  3. Clustering • You can cluster to estimate when the numbers are close to the same number. Example: 412+ 398+ 385+ 409 400+ 400+ 400+ 400= 1,600

  4. Front-end estimation • This helps you get a rough estimations. Add only the first digits that have the same place value. 6,829+ 3,401 6,000+ 3,000= 9,000

  5. Front-end estimation with adjusting • Add the front-end digits. 6,829+ 3,401 6,000 + 3,000= 9,000 2. 829+ 401 800+ 400= 1,200 3. Next add the 9,000+ 1,200= 10,200

  6. Practice Estimate answer. Tell me which method you used. 668+4,329 5,092-847 774+ 802+ 815+ 785+ 798 4,632+ 4,018 781-37 99,743-11,236

  7. Mixed Review Round each number to the underlined place. 98,036 432,128,973 1,257 Write 5x5x5x5x5 in exponent form. What does that equal?

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