# Georgia Department of Education Georgia Standards of Excellence Framework GSE Grade 6 Mathematics Unit 5

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1 **Volume and Cubes Back to Task Table In this problem-based task, students will examine the mathematical relationship between the volume of a rectangular prism in cubic units and the number of unit cubes with fractional edge lengths (i.e., ½-inch) it takes to fill the prism. STANDARDS FOR MATHEMATICAL CONTENT MGSE6.G.2 Find the volume of a right rectangular prism with fractional edge lengths by packing it with unit cubes of the appropriate unit fraction edge lengths (1/2 u), and show that the volume is the same as would be found by multiplying the edge lengths of the prism. Apply the formulas V = (length) x (width) x (height) and V= (area of base) x (height) to find volumes of right rectangular prisms with fractional edge lengths in the context of solving real-world and mathematical problems. STANDARDS FOR MATHEMATICAL PRACTICE 1. Make sense of problems and persevere in solving them. Students will solve problems by finding the volume of rectangular prisms with fractional edges. 2. Reason abstractly and quantitatively Students will use their understanding of the volume to find the number of cubes that will fit inside a rectangular prism. Students will be able to see and justify the reasoning packing a rectangular prism to find volume. 6. Attend to precision. Students will use appropriate measurement units (square units and cubic units) and correct terminology to justify reasonable solutions. 7. Look for and make use of structure. Students will understand the relationship between the structure of a three-dimensional shape and its volume formula 8. Look for and express regularity in repeated reasoning. Students use properties of figures and properties of operations to connect formulas to volume. ESSENTIAL QUESTIONS What happens to the number of cubes that will fit into a rectangular prisms change when the sizes of the cubes change? How can I determine the appropriate units of measure that should be used when computing the volumes of a right rectangular prism? In what ways can I measure the volume of a rectangular prism with fractional edge lengths? TEACHER NOTES You may wish to have students create a net for a rectangular prism that is 2 in. by 1½ in. by 4 in. and try to fill it with 12 one-cubic-inch cubes. This will help reveal a meaningful context for examining the volume of rectangular prisms with fractional edge lengths. July 2015 Page 62 of 126

2 **Volume and Cubes Part 1 The company Domino produces boxes that are 2 in. by 1½ in. by 4 in. The sugar cubes used to fill the box are 1 inch on each side. 1. What is the volume, in cubic inches, of the Domino box? 12 cubic inches 2. Look at your answer for #1. Is it possible for Domino to put 12 sugar cubes in each box? No. Only 8 sugar cubes would fit, because one of the dimensions is 1½ inches, and a 1-cubic-inch sugar cube will not fit into a ½-inch-wide space. 3. Domino recently decided to decrease the size of the sugar cubes and make them ½ in. on all sides. Jeremy thinks that since the sugar cubes are twice as small, so the box should fit twice as many cubes. Do you agree or disagree? Explain. Jeremy is incorrect because more than one dimension of the sugar cube was cut in half. The length, width, and height were each halved, so the sugar cubes were actually 1/8 of the original size. 4. What is the volume of each sugar cube (now that each side is ½ inch long)? (½ ½ ½) = 1/8in How many ½-in. sugar cubes would it take to fill the Domino box? 12 in. 3 1/8in. 3 = 96 cubes OR = 96 half-inch sugar cubes 6. The Domino Company packs 36 boxes in each case to ship to stores. a. You have been assigned the task to determine the least amount of volume required to hold 36 boxes. Explain how you arrived at your answer. The volume of each individual box is 12 cubic inches = 432 cubic inches. The case needs to hold at least 432 in. 3 b. How many ½-in. sugar cubes would be in each case? Explain how you know. There are 96 sugar cubes in each Domino box. 36 boxes are packed inside each case. So, = 3,456 sugar cubes. July 2015 Page 63 of 126

3 Part 2 Use the rectangular prism above to answer questions How many cubes are there in the rectangular prism? 42 cubes 2. What are the dimensions of the cubes used to build the rectangular prism? ½ inch by ½ inch by ½ inch 3. What is volume of each cube? 1 /8 in What is the volume of the rectangular prism? 5 ¼ in How is the volume of the rectangular prism related to the number of cubes and volume of cubes that fit into the rectangular prism? The volume of the rectangular prism is also the number of cubes multiplied by the volume of each cube. 42 times 1 / 8 in. 3 is equal to the volume of the prism (5¼ in. 3 ) July 2015 Page 64 of 126

4 Part 3 1. What is the volume of the rectangular prism above? 4.5 ft Using cubes with side lengths of ½-foot, how many cubes would fit inside the rectangular prism? (4)(3)(3) = 36 cubes 3. What is the volume of each cube in question 2? 1 / 8 ft Multiply the number of cubes by the volume of each cube. EXPLAIN how this answer compares to the volume you calculated in number 1? (1/8)(36) = 4.5 in 3 5. Using cubes with side lengths of ¼ foot, how many cubes would fit inside this rectangular prism? (8)(6)(6) = 288 cubes 6. What is the volume of each cube? 1 / 64 ft 3 7. Multiply the number of cubes by the volume of each cube, and EXPLAIN how this answer compares to the volume you calculated in number 6?. (1/64)(288) = 4.5 ft 3 Volume is the same each time, 4.5 ft 3. They number of cubes and size of cubes did not change the volume. 8. Why does the number of cubes change but the volume stays the same? The volume prism is fixed. The number of cubes depends upon the dimensions of the cube. July 2015 Page 65 of 126

5 Part 4 1. How many 1-in. cubes are needed to fill the bottom of the rectangular prism? (9)(10) = 90 cubes 2. How many rows (layers) will be needed to fill the entire rectangular prism? 4 rows 3. How many ½-in. cubes are needed to fill the bottom of the rectangular prism? (18)(20) = 360 cubes 4. How many rows (layers) will be needed to fill the entire rectangular prism? 8 rows 5. How many ¼-in. cubes are needed to fill the bottom of the rectangular prism? (36)(40) = 1440 cubes 6. How many rows (layers) will be needed to fill the entire rectangular prism? 16 rows 7. What relationship do you see between the size of the cube and the number of cubes needed to fill the rectangular prism? As the size of the cubes increase the number of cubes needed to fill the rectangular prism decreases. July 2015 Page 66 of 126

6 Volume and Cubes Name Part 1 Domino produces boxes that are 2 in. by 1½ in. by 4 in. The sugar cubes used to fill the box are 1 inch on each side. 1. What is the volume, in cubic inches, of the Domino box? 2. Look at your answer for #1. Is it possible for Domino to put 12 sugar cubes in each box? 3. Domino recently decided to decrease the size of the sugar cubes and make them ½ in. on all sides. Jeremy thinks that since the sugar cubes are twice as small, so the box should fit twice as many cubes. Do you agree or disagree? Explain. 4. What is the volume of each sugar cube (now that each side is ½ inch long)? 5. How many ½-in. sugar cubes would it take to fill the Domino box? 6. The Domino Company packs 36 boxes in each case to ship to stores. a. You have been assigned the task to determine the least amount of volume required to hold 36 boxes. Explain how you arrived at your answer. b. How many ½-in. sugar cubes would be in each case? Explain how you know. July 2015 Page 67 of 126

7 Part 2 Use the rectangular prism above to answer questions How many cubes are there in the rectangular prism? 2. What are the dimensions of the cubes used to build the rectangular prism? 3. What is volume of each cube? 4. What is the volume of the rectangular prism? 5. How is the volume of the rectangular prism related to the number of cubes and volume of cubes that fit into the rectangular prism? July 2015 Page 68 of 126

8 Part 3 1. What is the volume of the rectangular prism above? 2. Using cubes with side lengths of ½ foot, how many cubes would fit inside the rectangular prism? 3. What is the volume of each cube in question 2? 4. Multiply the number of cubes by the volume of each cube. EXPLAIN how this answer compares to the volume you calculated in number 1? 5. Using cubes with side lengths of ¼ foot, how many cubes would fit inside this rectangular prism? 6. What is the volume of each cube? 7. Multiply the number of cubes by the volume of each cube, EXPLAIN how this answer compares to the volume you calculated in number 6? 8. Why does number of cubes change but the volume stays the same? July 2015 Page 69 of 126

9 Part 4 1. How many 1-in. cubes are needed to fill the bottom of the rectangular prism? 2. How many rows will be needed to fill the entire rectangular prism? 3. How many ½-in. cubes are needed to fill the bottom of the rectangular prism? 4. How many rows will be needed to fill the entire rectangular prism? 5. How many ¼-in. cubes are needed to fill the bottom of the rectangular prism? 6. How many rows will be needed to fill the entire rectangular prism? 7. What relationship do you see between the size of the cube and the number of cubes needed to fill the rectangular prism? July 2015 Page 70 of 126

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