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G6 m1-c-lesson 19-t
1.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Cups of Blue Paint 1 2 3 4 Cups of Red Paint 2 4 6 8 Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 148 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Student Outcomes Students solve problems by analyzing different unit rates given in tables, equations, and graphs. Materials Matching activity cut and prepared for groups Classwork Analyze tables, graphs, and equations in order to compare rates. Examples 1–2 (10 minutes): Creating Tables from Equations Let’s fill in the labels for each table as shown in the completed table below. If we have 1 cup of blue paint, how many cups of red paint would we have? Model where these values go on the table. If we have 2 cups of blue paint, how many cups of red paint would we have? Model where these values go on the table. Examples 1–2: Creating Tables from Equations 1. The ratio of cups of blue paint to cups of red paint is ퟏ: ퟐ, which means for every cup of blue paint, there are two cups of red paint. In this case, the equation would be 풓풆풅 = ퟐ × 풃풍풖풆 or 풓 = ퟐ풃, where 풃 represents the amount of blue paint and 풓 represents the amount of red paint. Make a table of values. Follow this line of questioning for a few more values. Examine the table, identify the unit rate. 2 Where do you see this value in the equation? The unit rate is represented in the equation as the value by which the cups of blue paint are being multiplied.
2.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 Number of days ퟏ ퟐ ퟑ ퟒ Number of books ퟑ ퟒ ퟔ ퟒ 풐풓 ퟏ ퟏ ퟐ ퟗ ퟒ 풐풓 ퟐ ퟏ ퟒ ퟏퟐ ퟒ 풐풓 ퟑ Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 149 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. 2. Ms. Siple is a librarian who really enjoys reading. She can read ퟑ ퟒ of a book in one day. This relationship can be represented by the equation 풅풂풚풔 = ퟑ ퟒ 풃풐풐풌풔, which can be written as 풅 = ퟑ ퟒ 풃, where 풃 is the number of books and 풅 is the number of days. Encourage students to fill in the table on their own. If students need more assistance, teachers can ask leading questions similar to those above. Have students recognize the unit rate in the table and the equation, so they can later identify the unit rate in equations without creating a table.
3.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 150 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Example 3 (13 minutes): Matching Match an equation, table, and graph that represent the same unit rate. Students work individually or in pairs. Cut apart the data representations and supply each student-pair with a set.
4.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 풎 = ퟔퟓ풉 풎 = ퟒퟓ풉 풎 = ퟓퟓ풉 풎 = ퟕퟎ풉 풎 = ퟓퟎ풉 풎 = ퟔퟎ풉 Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 151 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. 풉 ퟎ ퟐ ퟒ ퟔ 풎 ퟎ ퟏퟑퟎ ퟐퟔퟎ ퟑퟗퟎ 풉 ퟎ ퟑ ퟔ ퟗ 풎 ퟎ ퟏퟑퟓ ퟐퟕퟎ ퟒퟎퟓ 풉 ퟎ ퟓ ퟏퟎ ퟏퟓ 풎 ퟎ ퟐퟕퟓ ퟓퟓퟎ ퟖퟐퟓ 풉 ퟎ ퟏ ퟐ ퟑ 풎 ퟎ ퟔퟎ ퟏퟐퟎ ퟏퟖퟎ 풉 ퟎ ퟖ ퟏퟔ ퟐퟒ 풎 ퟎ ퟒퟎퟎ ퟖퟎퟎ ퟏퟐퟎퟎ 풉 ퟎ ퟔ ퟏퟐ ퟏퟖ 풎 ퟎ ퟒퟐퟎ ퟖퟒퟎ ퟏퟐퟔퟎ
5.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 Hours ퟎ ퟑ ퟔ Miles ퟎ ퟕퟓ ퟏퟓퟎ Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 152 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Exercises 1–3 (12 minutes) Students work on problems individually. Encourage students to explain their thinking. 1. Bryan and ShaNiece are both training for a bike race and want to compare who rides his or her bike at a faster rate. Both bikers use apps on their phones to record the time and distance of their bike rides. Bryan’s app keeps track of his route on a table, and ShaNiece’s app presents the information on a graph. The information is shown below. Bryan: ShaNiece: a. At what rate does each biker travel? Explain how you arrived at your answer. Bryan: Hours Miles Bryan travels at a rate of ퟐퟓ miles per hour. The double number line had to be split in 3 equal sections, that’s how I got ퟐퟓ (ퟐퟓ + ퟐퟓ + ퟐퟓ) = ퟕퟓ. ShaNiece travels at ퟏퟓ miles per hour. I know this by looking at the point (ퟏ,ퟏퟓ) on the graph. The 1 represents hours and the ퟏퟓ represents miles. b. ShaNiece wants to win the bike race. Make a new graph to show the speed ShaNiece would have to ride her bike in order to beat Bryan. The graph shows ShaNiece traveling at a rate of 30 miles per hour, which is faster than Bryan. 1 2 3 25 50 75 MP.2
6.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 2. Braylen and Tyce both work at a movie store and are paid by the hour. The manager told the boys they both earn the same amount of money per hour, but Braylen and Tyce did not agree. They each kept track of how much money they earned in order to determine if the manager was correct. Their data is shown below. Braylen: 풎 = ퟏퟎ.ퟓퟎ풉 where 풉 is the number of hours worked and 풎 is the amount of money Braylen was paid Hours 0 3 6 Money 0 34.50 69 1 2 3 11.50 23.00 34.50 Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 153 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Tyce: a. How much did each person earn in one hour? Hours Money Tyce earned$ퟏퟏ.ퟓퟎ per hour. Braylen earned$ퟏퟎ.ퟓퟎ per hour. b. Was the manager correct? Why or why not? The manager was not correct because Tyce earned$ퟏ more than Braylen in one hour. 3. Claire and Kate are entering a cup stacking contest. Both girls have the same strategy: stack the cups at a constant rate so that they do not slow down at the end of the race. While practicing, they keep track of their progress, which is shown below. Claire: Kate: 풄 = ퟒ풕 where 풕 = time in seconds and 풄 = the number of stacked cups a. At what rate does each girl stack her cups during the practice sessions? Claire stacks cups at a rate of 5 cups per second. Kate stacks cups at a rate of 4 cups per second. b. Kate notices that she is not stacking her cups fast enough. What would Kate’s equation look like if she wanted to stack cups faster than Claire? 풄 = ퟔ풕 풕 = time in seconds 풄 = the number of cups stacked MP.2
7.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 Lesson Summary When comparing rates and ratios, it is best to find the unit rate. Comparing unit rates can happen across tables, graphs, and equations. Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 154 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Closing (5 minutes) Students share their answers to exercises and answer the following questions: How do you identify the unit rate in a table, graph, and equation? Why was the unit rate instrumental when comparing rates? Exit Ticket (5 minutes)
8.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 Name ___________________________________________________ Date____________________ Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Seconds 5 10 15 Math Facts 20 40 60 Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 155 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. Exit Ticket 1. Kiara, Giovanni , and Ebony are triplets and always argue over who can answer basic math facts the fastest. After completing a few different math minutes, Kiara, Giovanni, and Ebony recorded their data, which is shown below. Kiara: 푚 = 5푡 where 푡 = time in seconds and Ebony: 푚 = number of math facts completed Giovanni: a. What is the math fact completion rate for each student? b. Who would win the argument? How do you know?
9.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 Exit Ticket Sample Solutions The following solutions indicate an understanding of the objectives of this lesson: 1. Kiara, Giovanni, and Ebony are triplets and always argue over who can answer basic math facts the fastest. After completing a few different math minutes, Kiara, Giovanni, and Ebony recorded their data, which is shown below. Kiara: 풎 = ퟓ풕 where 풕 = time in seconds and Ebony: Seconds 5 10 15 Math Facts 20 40 60 Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 156 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. 풎 = number of math facts completed Giovanni: a. What is the math fact completion rate for each student? Kiara: 5 math facts/second Giovanni: 4 math facts/second Ebony: 6 math facts/second b. Who would win the argument? How do you know? Ebony would win the argument because when comparing the unit rates of the three triplets, Ebony completes math facts at the fastest rate. Problem Set Sample Solutions 1. Victor was having a hard time deciding on which new vehicle he should buy. He decided to make the final decision based on the gas efficiency of each car. A car that is more gas efficient gets more miles per gallon of gas. When he asked the manager at each car dealership for the gas mileage data, he received two different representations, which are shown below. Vehicle 1: Legend Vehicle 2: Supreme Gallons of Gas 4 8 12 Miles 72 144 216 a. If Victor based his decision only on gas efficiency, which car should he buy? Provide support for your answer. Victor should buy the Legend because it gets ퟏퟖ miles per gallon of gas, and the Supreme only gets ퟏퟔ ퟐ ퟑ miles per gallon. Therefore, the Legend is more gas efficient.
10.
NYS COMMON CORE
MATHEMATICS CURRICULUM Lesson 19 6•1 b. After comparing the Legend and the Supreme, Victor saw an advertisement for a third vehicle, the Lunar. The manager said that the Lunar can travel about ퟐퟖퟗ miles on a tank of gas. If the gas tank can hold ퟏퟕ gallons of gas, is the Lunar Victor’s best option? Why or why not? The Lunar is not a better option than the Legend because the Lunar only gets ퟏퟕ miles per gallon, and the Legend gets ퟏퟖ miles per gallon. Therefore, the Legend is still the best option. Lesson 19: Comparison Shopping—Unit Price and Related Measurement Conversions Date: 10/20/14 157 © 2013 Common Core, Inc. Some rights reserved. commoncore.org This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.
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