# Lesson: Total Cost: Given the Unit Cost

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### Lesson Objective

SWBAT solve for the total cost when given the unit cost

### Lesson Plan

Materials Needed: DN worksheet, a CD for a visual aide, GP worksheet, IND worksheet
Vocabulary: unit, cost, multiplication, total

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Do Now (2 - 3 min): Teacher gives each student a copy of their DN Worksheet and asks them to complete the work quietly.

Opening (2 -3 min): Teacher reviews the DN Worksheet. Teacher says, “Today, I am going to need you to put on your critical thinking hats and remember when we talked about money and cost earlier in the year. Today we are going to combine a lot of information that you are already familiar with in order to learn a new skill. By the end of the lesson today, you will be able to solve a problem to find the total cost.”

Teacher continues, “I don’t expect you to completely understand how the world economy works right now! However, I do want you to remember two things!” Teacher writes on the board:

Unit cost= special cost because you are buying more than one of something

Teacher says, “Today, we are going to calculate the total cost if we are given the unit cost of something. Tomorrow we will work on finding the unit cost if we are given the total cost. Now, I said I want you to remember two things, the first is the definition of a unit cost, and the second is that we always use multiplication when we are finding the total cost of something. We will multiply the cost by the amount of the item we want to buy.” Teacher writes the following on the board:

The unit cost of a CD is \$8, how much will you spend if you buy 100 CDs at this cost?

Teacher says, “If I have a problem like this, I want to set up a mathematical equation that will help me solve the problem. This problem says that a CD cost \$8 (teacher writes 8 on the board) and I am buying 100 CDs (teacher writes 100 on the board). What operation did I say we use when we are calculating the total? [Multiplication] Very good! So I will multiply 8x100 and this equals 800. So I know that it will cost \$800 to buy 100 CDs that cost \$8 each. Now, I want you all to try to calculate the total cost of certain items in small groups. I will give you a worksheet with three problems on it, and I want you all to solve those three problems together. When you are finished, I will review them with you before I ask you to practice on your own.”

Guided Practice (10 -12 min): Teacher gives each math group a GP worksheet and circulates the room to answer any questions. When most students are finished, the teacher reviews the answers to each problem on the board, making sure to highlight the definition of a unit cost, and that you must multiply to find the total cost.

Independent Practice (10 min): The teacher hands out the IND Practice worksheet. Students are asked to complete the worksheet independently and turn it in.

Closing (2-3 min): Teacher calls the attention of the students back toward the front of the class to quickly review the answers to the Independent Practice worksheet/ ask what we learned about.

### Lesson Resources

 GP lesson 5 unit cost   Classwork 5 DN lesson 5 unit cost   Starter / Do Now 5 IND lesson 5 unit cost   Classwork 3