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Estimating Sums and Differences

Estimating Sums and Differences. Can you estimate the answers to these math problems?. 6/7 - 1/3 11/12 + 4/7 1/9 + 5/8 Work with a partner to determine the estimated answer for each of these problems. Be prepared to explain how you got your answer!.

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Estimating Sums and Differences

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  1. Estimating Sums and Differences

  2. Can you estimate the answers to these math problems? • 6/7 - 1/3 • 11/12 + 4/7 • 1/9 + 5/8 • Work with a partner to determine the estimated answer for each of these problems. Be prepared to explain how you got your answer!

  3. What do you do?(Yes, write these notes in your journal) • Estimate the fractions • Step 1 • Look at the first fraction • Round it to the nearest 0, 1/2, or 1 • Step 2 • Look at the second fraction • Round it to the nearest 0, 1/2, or 1 • Step 3 • Add the rounded fractions to get an estimated answer

  4. Create the QUESTION! • Help, help! An error has been made. The publishers of the math program forgot to write the questions to a test! They only remembered to print the answers in the teacher’s guide. • Can you create challenging questions, based on logical thinking and high caliber math skills, for the answers provided? • (Extra points for especially creative answers…)

  5. Sample • Answer = about 4 hours • Question = Thad practiced playing the flute for 1 and 3/4 hours before dinner and 2 and 1/8 hours after dinner. About how long did Thad practice playing his flute?

  6. Create the QUESTION! • Answer = about 3 1/2 miles • Answer = about 15 feet of wire • Answer = about 7 1/2 yards of ribbon • Answer = about 12 gallons

  7. Create the QUESTION! • Answer = about 3 cups of flour • Answer = about 4 hours • Answer = about 5 1/2 inches

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