mod 4 lesson 21

Module 4 Lesson 21 Writing and Evaluating Expressions—Multiplication and Addition.notebook

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Monday Problem Set Lesson 21Tuesday Problem Set Lesson 22Wednesday Problem Set Lesson 23Thursday Problem Set Lesson 24

Friday Problem Set Lesson 25Math Fun Night 6:308:30 HSE

Field Trip Permission Slips due FRIDAY


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Problem Set Lesson 20 Answers


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MODULE 4 Expressions and EquationsTopic F: Writing and Evaluating

Expressions and Formulas Lesson 21: Writing and Evaluating Expressions—

Multiplication and Addition

Student Outcomes§ Students develop formulas involving multiplication and addition from real‐world problems.

§ Students evaluate these formulas for given values.


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§ Today we will model a problem that happens in restaurants every day: moving tables together so that everyone in a group can sit together. Use square tiles to represent square tables. One person can sit along each edge of a table side. (No crowding!) Our first goal is to find how many people can sit at tables made of various numbers of square tables pushed together end‐to‐end.

§ Use the table in your student materials to record your findings.


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Classwork Exercise 1The Italian Villa Restaurant has square tables that the servers can push together to accommodate the customers. Only one chair fits along the side of the square table. Make a model of each situation to determine how many seats will fit around various rectangular tables.


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Are there any other ways to think about solutions to this problem?It is impractical to make a model of pushing 50 tables together to make a long rectangle. If we did have a rectangle that long, how many chairs would fit on the long sides of the table?

How many chairs fit on the ends of the long table?

How many chairs fit in all? Record it.


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Example 2Determine the cost for various numbers of pizzas, and also determine the expression that describes the cost of having P pizzas delivered.a. Pizza Queen has a special offer on lunch pizzas $4.00 each. They charge $2.00 to deliver, regardless of how many pizzas are ordered. Determine the cost for various numbers of pizzas, and also determine the expression that describes the cost of having P pizzas delivered.


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What mathematical operations did you need to perform to find the total cost?

Suppose our principal wanted to buy a pizza for everyone in our class? Determine how much this would cost.

b. If the booster club had $400 to spend on pizza, what is the greatest number of pizzas they could order?


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c. If the pizza price was raised to $5.00 and the delivery price was raised to$3.00, create a table that shows the total cost (pizza plus delivery) of 1, 2, 3, 4, and 5 pizzas. Include the expression that describes the new cost of ordering P pizzas.


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Closing

Please take out your exit ticket for Lesson 21, close your binder, and complete the exit ticket. This will be collected.

§ Some mathematical expressions use both multiplication and addition. With your partner, make up a new example of a problem that uses both multiplication and addition.


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mod 4 lesson 21

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