Challenge Exercises for Adding and Subtracting Decimals

Directions: Read each question below. You may use paper and pencil to help you find the answers. Click once in an ANSWER BOX and type in your answer; then click ENTER. Do not use commas in your answers, just digits. After you click ENTER, a message will appear in the RESULTS BOX to indicate whether your answer is correct or incorrect. To start over, click CLEAR.

1. Write a decimal for twelve and nine hundred-thousandths.
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2. Write a decimal for sixty-three and five hundred millionths.
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3. Write a decimal for one hundred twenty-nine thousand, thirty-three and eighty-four ten-thousandths.
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4. The batting averages of five American League players are shown in the table below. Which batting average is the highest? 
1. Ichiro Suzuki, Sea .351
2. Jorge Posada, NYY .338
3. Magglio Ordonez, Det .363
4. Placido Polanco, Det .341
5. David Ortiz, Bos .332

[Source: http://sports.espn.go.com/mlb/statistics]

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5. Write the smallest possible decimal between zero and one that uses the digits 5, 0, 8, 1, 7, and 2 exactly once. (A leading zero should not be used.)
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6. Write the greatest possible decimal between zero and one that uses the digits 9, 0, 2, 6, 4 and 1 exactly once.
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7. Expenses for the LaChance family vacation were $978.50 for hotels, $489.95 for meals, $162.79 for transportation, and $76.12 for souvenirs. Estimate the total cost by rounding to the nearest one.
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8. What is the total cost for question 7?
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9. Lilly owes her sister $12.95. About how much change will she receive from a $50 bill?
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10.   Jill scored 9.007 in gymnastics. Jack scored 8.949. How much higher was Jill's score than Jack's? 
 
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