Unit 2, Lesson 15: Part-Part-Whole Ratios
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1 Unit 2, Lesson 15: Part-Part-Whole Ratios Lesson Goals Explain how to use tape diagrams to solve problems about ratios of quantities with the same units. Use a ratio of parts and a total to find the quantities of individual parts. Required Materials snap cubes graph paper tools for creating a visual display 15.1: True or False: Multiplying by a Unit Fraction (10 minutes) Setup: Display one problem at a time. 1 minute of quiet think time, followed by a whole-class discussion. True or false? 1. True 2. False 3. True 4. True Unit 2: Introducing Ratios, Lesson 15: Part-Part-Whole Ratios 1
2 15.2: Cubes of Paint (10 minutes) Setup: A quick discussion on using snap cubes to represent situations. Students in groups of 3 5. Provide 50 red and 30 blue snap cubes to each group. Unit 2: Introducing Ratios, Lesson 15: Part-Part-Whole Ratios 2
3 A recipe for maroon paint says, Mix 5 ml of red paint with 3 ml of blue paint. 1. Use snap cubes to represent the amounts of red and blue paint in the recipe. Then, draw a sketch of your snap-cube representation of the maroon paint. a. What amount does each cube represent? 1. Show 5 red snap cubes and 3 blue ones. a. Each snap cube represents 1 ml. b. How many milliliters of maroon paint will there be? 2. a. Suppose each cube represents 2 ml. How much of each color paint is there? Red: ml Blue: ml Maroon: ml b. 8 ml 2. a. 10 ml of red, 6 ml of blue, 16 ml of maroon b. 25 ml of red, 15 ml of blue, 40 ml of maroon b. Suppose each cube represents 5 ml. How much of each color paint is there? Red: ml Blue: ml Maroon: ml 3. a. 50 ml red, 30 ml blue, 80 ml maroon b. 10 batches 3. a. Suppose you need 80 ml of maroon paint. How much red and blue paint would you mix? Be prepared to explain your reasoning. Red: ml Blue: ml Maroon: 80 ml b. If the original recipe is for one batch of maroon paint, how many batches are in 80 ml of maroon paint? Anticipated misconceptions Students may need help interpreting Suppose each cube represents 2 ml. If necessary, suggest they keep using one cube to represent 1 ml of paint. So, for example, the second question would be Unit 2: Introducing Ratios, Lesson 15: Part-Part-Whole Ratios 3
4 represented by 5 stacks of 2 red cubes and 3 stacks of 2 blue cubes. If they use that strategy, each part of the tape diagram would represent one stack. Unit 2: Introducing Ratios, Lesson 15: Part-Part-Whole Ratios 4
5 15.3: Sneakers, Chicken, and Fruit Juice (20 minutes) Setup: Keep students in the same groups. Provide graph paper and snap cubes (any three colors). Solve each of the following problems and show your thinking. If you get stuck, consider drawing a tape diagram to represent the situation. 1. The ratio of students wearing sneakers to those wearing boots is 5 to 6. If there are 33 students in the class, and all of them are wearing either sneakers or boots, how many of them are wearing sneakers? students cups of oil, 14 cups of soy sauce, 7 cups of orange juice 2. A recipe for chicken marinade says, Mix 3 parts oil with 2 parts soy sauce and 1 part orange juice. If you need 42 cups of marinade in all, how much of each ingredient should you use? 3. Elena makes fruit punch by mixing 4 parts cranberry juice to 3 parts apple juice to 2 parts grape juice. If one batch of fruit punch includes 30 cups of apple juice, how large is this batch of fruit punch? cups Anticipated misconceptions Students may think of each segment of a tape diagram as representing each cube, rather than as a flexible representation of an increment of a quantity. Help them set up the tapes with the correct number of sections and then discuss how many parts there are in all. Unit 2: Introducing Ratios, Lesson 15: Part-Part-Whole Ratios 5
6 Are you ready for more? Using the recipe from earlier, how much fruit punch can you make if you have 50 cups of cranberry juice, 40 cups of apple juice, and 30 cups of grape juice? Possible Responses cups. Figure out which ingredient you d run out of first. Cranberry juice limits you to batches, less than for apple juice and 15 for grape juice. Then, multiply by 9 cups per batch. Unit 2: Introducing Ratios, Lesson 15: Part-Part-Whole Ratios 6
7 15.4: Invent Your Own Ratio Problem (Optional, 10 minutes) Setup: Keep students in the same groups. Provide graph paper, snap cubes (any three colors), and tools for creating a visual display. 1. Invent another ratio problem that can be solved with a tape diagram and solve it. If you get stuck, consider looking back at the problems you solved in the earlier activity. Answers vary. 2. Create a visual display that includes: The new problem that you wrote, without the solution. Enough work space for someone to show a solution. 3. Trade your display with another group, and solve each other s problem. Include a tape diagram as part of your solution. Be prepared to share the solution with the class. 4. When the solution to the problem you invented is being shared by another group, check their answer for accuracy. Lesson Synthesis (5 minutes) What made these problems different? How can a tape diagram represent these types of situations? How does changing the value of each part of the tape affect the total amount? Unit 2: Introducing Ratios, Lesson 15: Part-Part-Whole Ratios 7
8 15.5: Room Sizes (Cool-down, 5 minutes) Setup: Access to graph paper. The first floor of a house consists of a kitchen, playroom, and dining room. The areas of the kitchen, playroom, and dining room are in the ratio. The combined area of these three rooms is 189 square feet. What is the area of each room? The area of the kitchen is 84 square feet. The area of the playroom is 63 square feet. The area of the dining room is 42 square feet. Unit 2: Introducing Ratios, Lesson 15: Part-Part-Whole Ratios 8
Unit 2, Lesson 15: Part-Part-Whole Ratios
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