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Module 7: Understanding Non-Proportional Relationships |
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Task Introduction |
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Welcome Message: |
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"Welcome to this module on understanding non-proportional relationships! In this module, you’ll explore why certain relationships are not proportional, identify key characteristics, and connect these ideas to algebraic thinking. Let's dive into some problems to analyze!" |
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Problems: |
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Problem 1: Inverse Proportionality |
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Ali drives at an average rate of 25 miles per hour for 3 hours to get to his house from work. How long will it take him if he is able to average 50 miles per hour? |
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Problem 2: Non-Proportional Linear Relationship |
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Tugce’s cell phone service charges her $22.50 per month for phone service, plus $0.35 for each text she sends or receives. Last month, she sent or received 30 texts, and her bill was $33. How much will she pay if she sends or receives 60 texts this month? |
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Problem 3: Additive Relationship |
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Ali and Deniz both go for a run. When they run, both run at the same rate. Today, they started at different times. Ali had run 3 miles when Deniz had run 2 miles. How many miles had Deniz run when Ali had run 6 miles? |
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Step-by-Step Prompts for Analysis |
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1️⃣ Problem 1: Inverse Proportionality |
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Initial Prompt: |
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"Let’s start with Problem 1. Is the relationship between speed and time proportional? Why or why not?" |
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Hints for Teachers Who Are Stuck: |
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First Hint: |
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"Think about the relationship between speed and time. If Ali increases his speed, what happens to the time taken? Does this follow a direct proportional relationship?" |
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Second Hint: |
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"Consider whether the ratio of miles to hours remains constant. What do you observe when Ali drives faster?" |
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If the Teacher Provides a Correct Answer: |
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"Excellent! You correctly identified that this is an inverse proportional relationship—more speed means less time. This isn’t proportional because the ratio between speed and time isn’t constant." |
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2️⃣ Problem 2: Non-Proportional Linear Relationship |
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Initial Prompt: |
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"Let’s analyze Problem 2. Is the relationship between the number of texts and the total bill proportional? Why or why not?" |
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Hints for Teachers Who Are Stuck: |
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First Hint: |
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"Think about the initial cost of $22.50. Does this fixed amount affect whether the relationship is proportional?" |
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Second Hint: |
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"Consider if doubling the number of texts would double the total bill. What impact does the monthly fee have on the proportionality?" |
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Graphical Exploration: |
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"Let’s graph this relationship. Use an online tool like Desmos Graphing Calculator to plot the equation: y=22.50+0.35x. What do you observe about the graph? Does it pass through the origin?" |
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Follow-Up Prompt: |
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"Why does one graph pass through the origin and the other does not? What does this tell you about the proportionality of each equation?" |
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3️⃣ Problem 3: Additive Relationship |
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Initial Prompt: |
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"Now, let’s look at Problem 3. Is the relationship between the miles Ali and Deniz run proportional? Why or why not?" |
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Hints for Teachers Who Are Stuck: |
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First Hint: |
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"Think about whether the difference in miles remains constant as they run. Is this difference additive or multiplicative?" |
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Second Hint: |
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"If Ali always has a one-mile lead, does that suggest a proportional relationship or a consistent additive difference?" |
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If the Teacher Provides a Correct Answer: |
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"Excellent! You correctly identified that this relationship is additive, not proportional. Ali is always one mile ahead, which is a constant difference rather than a proportional factor." |
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Reflection and Discussion Prompts |
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Key Characteristics: |
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"What are the key characteristics that distinguish proportional relationships from non-proportional ones in these problems?" |
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Graphical Analysis: |
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"How can graphing these relationships help students understand whether they are proportional or not?" |
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Pedagogical Insights: |
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"Why is it important to expose students to both proportional and non-proportional relationships to develop a deeper understanding of ratios and proportions?" |
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Problem Posing Activity |
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Task Introduction: |
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"Now it’s your turn to create three non-proportional problems similar to the ones we just explored. Write each problem and explain why the relationship is not proportional." |
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Prompts to Guide Problem Posing: |
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Context Selection: |
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"Think about situations where a fixed starting value, additive differences, or inverse relationships might appear. How can you illustrate these through real-world contexts?" |
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Scaling Factor: |
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"Will your problem include a fixed cost, a consistent difference, or an inverse relationship? How does this make it non-proportional?" |
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Mathematical Representation: |
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"Can your problem be solved using an equation, table, or graph? How will students justify their reasoning?" |
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AI Evaluation Prompts: |
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1. Evaluating Problem Feasibility: |
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"Does your problem clearly demonstrate a non-proportional relationship? For example, does it involve a fixed cost, an additive difference, or an inverse relationship?" |
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Feedback: |
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✅ If Feasible: "Great problem! It clearly illustrates a non-proportional relationship and encourages critical thinking." |
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❌ If Not Feasible: "Your problem might need revision. For example, ensure there’s a clear reason why the relationship isn’t proportional. How could you adjust it?" |
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2. Evaluating Solution Processes: |
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"Can your problem be solved using tables, equations, and graphs? If not, what could be modified to ensure multiple solution approaches?" |
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Feedback: |
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✅ If Feasible: "Your solution pathway aligns well with non-proportional reasoning. Great work!" |
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❌ If Not Feasible: "It seems like one solution method isn’t fully applicable. For example, if the relationship is truly proportional, it needs revision. Can you adjust your problem?" |
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Final Reflection Prompts |
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Connecting Proportional and Non-Proportional Thinking: |
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"How does analyzing non-proportional relationships help reinforce students’ understanding of proportionality?" |
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Creativity in Mathematical Connections: |
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"Why is making connections between different mathematical ideas (e.g., proportional reasoning, inverse variation, linear functions) a key aspect of fostering creativity in students?" |
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Summary Section |
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1️⃣ Content Knowledge |
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You explored non-proportional relationships and how to differentiate them from proportional ones using inverse variation, fixed values, and additive relationships. |
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2️⃣ Creativity-Directed Practices |
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Mathematical generalization and extension: You analyzed real-world non-proportional scenarios and extended them through problem posing. |
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3️⃣ Pedagogical Content Knowledge |
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You reflected on helping students distinguish between proportional and non-proportional relationships by using contrasting examples, equations, and graphs. |
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4️⃣ Common Core Mathematical Practices (CCSSM): |
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✅ Make sense of problems & persevere in solving them |
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✅ Reason abstractly & quantitatively |
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✅ Construct viable arguments & critique the reasoning of others |
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✅ Model with mathematics |
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✅ Look for & make use of structure |
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