1. Topic A: Proportional Relationships
Lesson 4
Identifying Proportional and
Non-Proportional Relationships in Table

2. Topic A Overview
Lesson 1: An Experience in Relationships as Measuring Rate Lesson 2: Proportional Relationships Lessons 3-4: Identifying Proportional and Non-Proportional Relationships in Tables Lessons 5-6: Identifying Proportional and Non-Proportional Relationships in Graphs

3. LEARNING TARGET
Lesson 4: Identifying Proportional & Non-Proportional Relationships in Tables
Today I can determine if data in a table represents a proportional or non-proportional relationship by determining if there’s a constant of proportionality for each set of x and y values.
STANDARDS
7.RP.2a Decide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin.
AGENDA – Day 1
(5 min) Review Key Vocabulary
(10 min) Warm-Up: Which Team Will Win the Race?
(10 min) Share Solutions
(10 min) MODEL: Finding the Constant of Proportionality
(10 min) Proportional or Non-Proportional?
(10 min) Extension
(5 min) Exit Ticket
(30 min) Online Practice
KEY VOCABULARY
Proportional
Constant
Constant of Proportionality

4. Review Key Vocabulary
Proportional – when two quantities simplify to the same ratio.
Constant – a quantity having a value that does not change or vary.
Constant of Proportionality - a constant value of the ratio of two proportional quantities.

5. Warm-Up: Which Team Will Win the Race?
You have decided to run in a long distance race. There are two teams that you can join. Team A runs at a constant rate of 2.5 miles per hour. Team B runs 4 miles the first hour and then 2 miles per hour after that.
Task: Create a table for each team showing the distances that would be run for times of 1-6 hours.
Team A
Time (hrs)
Distance (miles) 1 2 3 4 5 6
Team B
Time (hrs)
Distance (miles) 1 2 3 4 5 6

6. MODEL: Finding the Constant of Proportionality
Team A runs at a constant rate of 2.5 miles per hour.
Team A
Time (hrs)
Distance (miles) 1 2 3 4 5 6

7. MODEL: Finding the Constant of Proportionality
Team B runs 4 miles the first hour and then 2 miles per hour after that.
Team B
Time (hrs)
Distance (miles) 1 2 3 4 5 6

8. Proportional or Non-Proportional?
For which team is distance proportional to time? Explain your reasoning.
Explain how you know the distance for the other team is not proportional to time?

9. Extension
If the race were 2.5 miles long, which team would win? Explain.
If the race were 3.5 miles long, which team would win? Explain.
If the race were 4.5 miles long, which team would win? Explain.

10. Exit Ticket
The table below shows the relationship between the side lengths of a regular octagon and its perimeter.
Side Length, s
(inches)
Perimeter, P 1 8 2 16 3 24 4 32 9 12
Complete the table.
If Gabby wants to make an octagon with a side length of 20 inches using wire, how much wire does she need? Justify your reasoning with an explanation of whether perimeter is proportional to the side length.

11. LEARNING TARGET
Lesson 3: Identifying Proportional & Non-Proportional Relationships in Tables
Today I can determine if data in a table represents a proportional or non-proportional relationship by determining if there’s a constant of proportionality for each set of x and y values.
STANDARDS
7.RP.2a Decide whether two quantities are in a proportional relationship, e.g., by testing for equivalent ratios in a table or graphing on a coordinate plane and observing whether the graph is a straight line through the origin.
AGENDA – Day 2
(10 min) Warm-Up
(5 min) Review Key Vocabulary
(5 min) Review: Which Team Will Win the Race?
(20 min) Discussion
(25 min) Lesson 4 Problem Set
(30 min) Lesson 4 Quiz
KEY VOCABULARY
Proportional
Constant
Constant of Proportionality

12. Warm-Up: Day 2
Does the table show that y is proportional to x? Explain. X Y 1 4 2 8 3 12 16

13. Review Key Vocabulary
Proportional – when two quantities simplify to the same ratio.
Constant – a quantity having a value that does not change or vary.
Constant of Proportionality - a constant value of the ratio of two proportional quantities.

14. Review: Which Team Will Win the Race?
You have decided to run in a long distance race. There are two teams that you can join. Team A runs at a constant rate of 2.5 miles per hour. Team B runs 4 miles the first hour and then 2 miles per hour after that.
Task: Create a table for each team showing the distances that would be run for times of 1-6 hours.
Team A
Time (hrs)
Distance (miles) 1 2 3 4 5 6
Team B
Time (hrs)
Distance (miles) 1 2 3 4 5 6

15. Discussion
For what length race would it be better to be on Team B than Team A? Explain.
Using the relationship, if the members on the team ran for 10 hours, how far would each member run on each team?
Will there always be a winning team, no matter what length of the course? Why or why not?

16. Discussion Continued…
If the race were 12 miles long, which team should you choose to be on if you wish to win? Why would you choose this team?
How much sooner would you finish on that team compared to the other team?

17. Lesson 4 – Problem Set 1 Point (Unsatisfactory) 2 Points
(Partially Proficient)
3 Points
(Proficient)
4 Points
(Advanced)
Missing or incorrect answer and little evidence of reasoning
Missing or incorrect answer but evidence of some reasoning
A correct answer with some evidence of reasoning or an incorrect answer with substantial evidence
A correct answer supported by substantial evidence of solid reasoning

18. Lesson 4 – Quiz 1 Point (Unsatisfactory) 2 Points
(Partially Proficient)
3 Points
(Proficient)
4 Points
(Advanced)
Missing or incorrect answer and little evidence of reasoning
Missing or incorrect answer but evidence of some reasoning
A correct answer with some evidence of reasoning or an incorrect answer with substantial evidence
A correct answer supported by substantial evidence of solid reasoning