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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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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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