Estimate Decimal Sums and Differences. How can you estimate decimal sums and differences? $27.95 $11.72
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1 ? Name Number and 1.6 Operations 5.3.A MATHEMATICAL PROCESSES 5.1.C Essential Question Estimate Decimal Sums and Differences How can you decimal sums and differences? Unlock the Problem A singer is recording a CD. The lengths of the three songs are 3.4 minutes, 2.78 minutes, and 4.19 minutes. About how much recording time will be on the CD? Use rounding to. Round to the nearest whole number. Then add Remember To round a number, determine the place to which you want to round. If the digit to the right is less than 5, the digit in the rounding place stays the same. If the digit to the right is 5 or greater, the digit in the rounding place increases by 1. So, there will be about _ minutes of recording time on the CD. Try This! Use rounding to. A Round to the nearest whole dollar. Then subtract. B Round to the nearest ten dollars. Then subtract. $27.95 $11.72 $27.95 $11.72 To the nearest dollar, $27.95 $11.72 is about. To the nearest ten dollars, $27.95 $11.72 is about. Do you want an over or an under when you the total cost of items you want to buy? Explain. Module 1 35
2 Use Benchmarks Benchmarks are familiar numbers used as points of reference. You can use the benchmarks 0, 0.25, 0.50, 0.75, and 1 to decimal sums and differences. Example Use benchmarks to Locate and graph a point on the number line for each decimal. Identify which benchmark each decimal is closer to Think: 0.76 is between and. It is closer to. Think: 0.22 is between 0 and It is closer to So, is about. _ _ = _ Math Talk Mathematical Processes Use the Example to explain how using rounding or benchmarks to a decimal difference can give you different answers. Share and Show Use rounding to $ $ 3.98 Use benchmarks to Math Talk Mathematical Processes Describe the difference between an and an exact answer.
3 Name Problem Solving Use rounding or benchmarks to Practice: Copy and Solve Use rounding or benchmarks to $26.92 $ Estimate to compare. Write < or > Problem Solving Use the table to solve 14. Show your work. Image Credits: (tr) Wes Thompson/Corbis 14. Representations For the week of April 4, 1964, the Beatles had the top four songs. About how long would it take to listen to these four songs? Use the table and estimation to solve Representations Gina had a scrambled egg, an oat bran muffin, and a cup of low-fat milk for breakfast. About how many grams of protein did Gina have at breakfast? 16. Multi-Step Pablo had a cup of shredded wheat cereal, a cup of low-fat milk, and one other item for breakfast. He had about 21 grams of protein. What was the third item Pablo had for breakfast? Number Top Songs Song Title Can t Buy Me Love She Loves You I Want to Hold Your Hand Please Please Me Song Length (in minutes) Grams of Protein per Serving Type of Food 1 scrambled egg 1 cup shredded wheat cereal 1 oat bran muffin 1 cup low-fat milk Protein (in grams) Module 1 Lesson 6 37
4 Daily Assessment Task Mathematical Processes Fill in the bubble completely to show your answer. 17. Multi-Step Marco has room for 15 more minutes of songs on his mp3 player. He has three songs to upload with the following lengths: 5.15 minutes, 3.8 minutes, and 4.4 minutes. After uploading all three songs, about how many minutes will he have left? A 3 minutes C 2 minutes B 1 minute D 0 minutes 18. Connect Geoff and Andrea want to combine their money to buy pizza. Geoff has $5.95. Andrea has $8.30. Which benchmarks should they use to the money they have? A $ $8.25 C $ $8.50 B $ $8.00 D $ $ Multi-Step Maiko wrote two songs. The first song was 2.9 minutes long. Then he added 0.4 minute. The second song was 5.6 minutes long. Then he subtracted 1.1 minutes from it. Use benchmarks to the length of each song. A B C D first song: 2.5 minutes, second song: 4 minutes first song: 3.5 minutes, second song: 4.5 minutes first song: 3.5 minutes, second song: 7 minutes first song: 2.5 minutes, second song: 5.5 minutes TEXAS Test Prep 20. Fran bought sneakers for $54.26 and a shirt for $ If Fran started with $100, about how much money does she have left? A $35 38 B $20 C $5 D $80
5 Homework and Practice Name Number and Operations 5.3.A MATHEMATICAL PROCESSES 5.1.C 1.6 Estimate Decimal Sums and Differences Use rounding or benchmarks to Estimate to compare. Write < or > $ $5.50 $ $ Problem Solving 11. Li is running a race around the school track. He runs kilometer during the first half of the race. What is the distance that he travels in the first half of the race, rounded to the nearest hundredth? 12. A video lasts 6.44 minutes. About how long does the video last, rounded to the nearest minute? Module 1 Lesson 6 39
6 Lesson Check TEXAS Test Prep Fill in the bubble completely to show your answer. 13. Dylan wants to buy a book for $16.95 and a magazine for $4.50. About how much will he need to buy the items without having to round down to the nearest benchmark? A $15 B $30 C $25 D $ Mike spends $23.40 on a present for his mom and a $18.95 on a present for his dad. If Mike started with $75, about how much money does he have left? A $30 B $50 C $20 D $ Multi-Step Jesse, Max, and Kalel each ate 0.32 of a pizza pie. Which number shows the best of how much of the pie they ate together? A 1.0 B 0.5 C 0.25 D Sasha downloads a song that is 4.32 minutes long and one that is 8.28 minutes long. About how many minutes will it take all of her songs to play if she already has 13.8 minutes of songs? A B C D 15 minutes 30 minutes 20 minutes 26 minutes 16. Danielle and Raj want to combine their money to buy a soccer ball. Danielle has $7.95. Raj has $6.35. Which benchmarks should they use to the money they have? A $ $6.50 B $ $6.25 C $ $6.50 D $ $ Multi-Step George is giving two speeches at school. The first was 3.4 minutes long. Then he added 0.9 minutes to the speech. The second speech was 4.1 minutes long. Then he subtracted 1.4 minutes from it. Use benchmarks to the length of each speech. A B first speech: 4.0 minutes; second speech: 3.5 minutes first speech: 4.0 minutes; second speech: 3 minutes 40 C D first speech: 4.5 minutes; second speech: 2.5 minutes first speech: 4.5 minutes; second speech: 3.5 minutes
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