Proportional and nonproportional relationships
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7 th Grade Math Lesson Objective: Students will identify proportional and nonproportional relationships. Proportional and Nonproportional Relationships. Vocabulary. Proportional Two quantities that have a constant ratio Example: Nonproportional

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Proportional and Nonproportional Relationships

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Proportional and nonproportional relationships

7th Grade Math

Lesson Objective:

Students will identify proportional and nonproportional relationships.

Proportional and Nonproportional Relationships


Vocabulary

Vocabulary

  • Proportional

    • Two quantities that have a constant ratio

    • Example:

  • Nonproportional

    • Two quantities that do NOT have a constant ratio

    • Example:

16 = 16

17 ≠20


Identifying proportional relationships

Identifying Proportional Relationships

  • Ms. Cochran is planning a year-end pizza party for her students. Ace Pizza offers free delivery and charges $8 for each medium pizza. Is the cost of an order proportional to the number of pizzas ordered?

16 = 16

Yes


Identifying proportional relationships1

Identifying Proportional Relationships

  • Uptown Pizzeria sells medium pizzas for $7 each but charges a $3 delivery fee per order. Is the cost of an order proportional to the number of pizzas ordered?

17 ≠20

No


Identifying proportional relationships2

Identifying Proportional Relationships

  • At the beginning of the school year, Isabel had $120 in the bank. Each week, she deposits another $20. Is her account balance proportional to the number of weeks since she started school?

140≠240

No


Identifying proportional relationships3

Identifying Proportional Relationships

  • A recipe for jelly frosting calls for 1/3 cup of jelly and 1 egg white. Is the number of egg whites used proportional to the cups of jelly used?

2/3= 2/3

Yes


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