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

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

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

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

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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

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

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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

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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.

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

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

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

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Review: Write the following in word form: 5.35 6.98

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Answers: Five and thirty five hundredths Six and ninety eight hundredths

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Write the following in Expanded form: 4.177

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Answer for 4.177 4+.1+.07+.007 Hint: Remember your chart 4.1.07.007

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

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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

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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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