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Proportional and Nonproportional Relationships

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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  1. 7th Grade Math Lesson Objective: Students will identify proportional and nonproportional relationships. Proportional and Nonproportional Relationships

  2. 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

  3. 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

  4. 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

  5. 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

  6. 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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