Lesson 28: Solve division word problems involving multi-digit division with group size unknown and the number of groups unknown. 375 This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. © 2015 Great Minds. eureka-math.orgG5-M2-TE-1.3.0-06.2015

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Lesson 28NYS COMMON CORE MATHEMATICS CURRICULUM 52Concept Development (38 minutes) Materials: (S) Problem Set Suggested Delivery of Instruction for Solving Topic H Word Problems 1. Model the problem. Have two pairs of students, who can be successful with modeling the problem, work at the board while the others work independently or in pairs at their seats. Review the following questions before beginning the first problem: Can you draw something? What can you draw? What conclusions can you make from your drawing? As students work, circulate. Reiterate the questions above. After two minutes, have the two pairs of students share only their labeled diagrams. For about one minute, have the demonstrating students receive and respond to feedback and questions from their peers. 2. Calculate to solve, and write a statement. Give everyone two minutes to finish work on that question, sharing their work and thinking with a peer. All should then write their equations and statements of the answer. 3. Assess the solution for reasonability. Give students one to two minutes to assess and explain the reasonableness of their solution. Note: In Lessons 28–29, the Problem Set comprises the word problems from the Concept Development. Problem 1 Ava is saving for a new computer that costs $1,218. She has already saved half of the money. Ava earns $14.00 per hour. How many hours must Ava work to save the rest of the money? This two-step equal groups with number of groups unknownproblem is a step forward for students as they divide the total in half and use their decimal division skills to divide 609 by 14 to find the number of hours Ava needs to work. In this case, the divisor represents the size of the unit. While circulating, use professional judgment to look for other alternate modeling strategies that can be quickly mentioned or explored more deeply. After the students have solved the problem, ask them to check their answer for reasonableness. T: How can you know if 43.5 is a reasonable answer? Discuss with your partner. Lesson 28: Solve division word problems involving multi-digit division with group size unknown and the number of groups unknown. 376 This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. © 2015 Great Minds. eureka-math.orgG5-M2-TE-1.3.0-06.2015

Lesson 28NYS COMMON CORE MATHEMATICS CURRICULUM 52Problem 2 Michael has a collection of 1,404 sports cards. He hopes to sell the collection in packs of 36 cards and make $633.75 when all the packs are sold. If each pack is priced the same, how much should Michael charge per pack?