# 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. ANSWER BOX:   RESULTS BOX:
 2 Write a decimal for sixty-three and five hundred millionths. ANSWER BOX:   RESULTS BOX:
 3 Write a decimal for one hundred twenty-nine thousand, thirty-three and eighty-four ten-thousandths. ANSWER BOX:   RESULTS BOX:
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 0.351 2. Jorge Posada, NYY 0.338 3. Magglio Ordonez, Det 0.363 4. Placido Polanco, Det 0.341 5. David Ortiz, Bos 0.332

ANSWER BOX:

RESULTS BOX:

 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.) ANSWER BOX:   RESULTS BOX:
 6 Write the greatest possible decimal between zero and one that uses the digits 9, 0, 2, 6, 4 and 1 exactly once. ANSWER BOX:   RESULTS BOX:
 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. ANSWER BOX: \$  RESULTS BOX:
 8 What is the total cost for question 7? ANSWER BOX: \$  RESULTS BOX:
 9 Lilly owes her sister \$12.95. About how much change will she receive from a \$50 bill? ANSWER BOX: \$  RESULTS BOX:
 10 Jill scored 9.007 in gymnastics. Jack scored 8.949. How much higher was Jill's score than Jack's?    ANSWER BOX:   RESULTS BOX: