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Proportional and Nonproportional RelationshipsPowerPoint Presentation

Proportional and Nonproportional Relationships

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Proportional and Nonproportional Relationships

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7th Grade Math

Lesson Objective:

Students will identify proportional and nonproportional relationships.

Proportional and Nonproportional Relationships

- Proportional
- Two quantities that have a constant ratio
- Example:

- Nonproportional
- Two quantities that do NOT have a constant ratio
- Example:

16 = 16

17 ≠20

- 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

- 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

- 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

- 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