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Decimal Place Value and Estimation

Decimal Place Value and Estimation. Test Friday, 9-19-08. You will need a pencil and a piece of paper before you begin this presentation. Vocabulary:. Clustering Indicated place value Rounding Estimate Difference Compatible numbers Nearest whole (tenth, hundredth …).

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Decimal Place Value and Estimation

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  1. Decimal Place Value and Estimation Test Friday, 9-19-08

  2. You will need a pencil and a piece of paper before you begin this presentation.

  3. Vocabulary: • Clustering • Indicated place value • Rounding • Estimate • Difference • Compatible numbers • Nearest whole (tenth, hundredth …)

  4. Estimate by rounding to the nearest whole number: • 4.218 + 6. 321

  5. Answer: • about 10 • Work: In order to round to the nearest whole number, look at the tenths place. (Rule 5 or more round up one, 4 or less stay the same. • 4.218 + 6. 321 4 + 6=10

  6. Estimate by rounding to the nearest tenth. • 4.723 + .888

  7. Answer: • 5.6 • Work: to round to the nearest tenth, look at the hundredths place. (Rule 5 or more up, 4 or less stay the same) • 4.723 + .888 4.7 + .9 = 5.6

  8. Use clustering to answer the following: • Three puppies have the following weights: 3.11 pounds, 2.98 pounds, and 2.96 pounds. Use clustering to determine their approximate total weight.

  9. Answer: • About 9 pounds • Work: (Clustering- round all numbers to the same value) • 3+3+3 = 9 (all the numbers are about 3)

  10. Estimate the quotient by using compatible numbers. • 65.23 divided by 8.001

  11. Answer: • 8 • Compatible Numbers: (make two numbers easier to divide.) • 65.23 divided by 8.001 • 64 divided by 8 is 8

  12. Review: • Write the following in word form: • 5.35 • 6.98

  13. Answers: • Five and thirty five hundredths • Six and ninety eight hundredths

  14. Write the following in Expanded form: • 4.177

  15. Answer for 4.177 • 4+.1+.07+.007 • Hint: Remember your chart

  16. Order the following numbers from least to greatest. • 5.769, 5.84, 5.41, 5.7694

  17. Answer for: 5.769, 5.84, 5.41, 5.7694 • 5.41, 5.769, 5.7694, 5.84 • Hint: Remember to look at the whole number, then tenths, hundredths, thousandths and ten thousandths

  18. Do not forget to study your worksheets I gave you, and your flip book. • Do not forget to play Jeopardy. • Good Luck on your test.

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