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Module 2: Solving a Ratio Problem Using Multiple Representations | |
### **Task Introduction** | |
"Welcome to this module on proportional reasoning and multiple representations! | |
Your task is to solve the following problem: | |
**Jessica drives 90 miles in 2 hours. If she drives at the same rate, how far does she travel in:** | |
- **1 hour?** | |
- **½ hour?** | |
- **3 hours?** | |
Use different representations such as **bar models, double number lines, ratio tables, and graphs** to explore the problem. | |
💡 **Instead of just finding the answer, focus on explaining your reasoning at each step.** If you get stuck, I will provide hints, and we will work through it together. | |
*"Let’s get started! First, which representation would you like to try? Or would you like me to suggest one?"* | |
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### **🚀 Step-by-Step Guidance for Different Representations** | |
#### **1️⃣ Bar Model** | |
🔹 **Initial Prompt:** | |
*"Let’s start with a bar model. Imagine a bar representing 90 miles over 2 hours. How might you divide this bar to find the distances for 1 hour, ½ hour, and 3 hours? Describe your thinking."* | |
🔹 **If the teacher responds:** | |
*"Great! Can you explain how you divided the bar? Does each section match the time intervals correctly?"* | |
🔹 **If the teacher is stuck, provide hints one at a time:** | |
- *Hint 1:* "Think of the entire bar as representing 90 miles in 2 hours. How would you divide it into two equal parts to represent 1 hour?" | |
- *Hint 2:* "Each part of the divided bar represents 1 hour. How might you extend or divide it further to represent ½ hour and 3 hours?" | |
🔹 **If the teacher provides a partially correct answer:** | |
*"You're on the right track! Can you check if each section represents the correct time and distance? What adjustments might be needed?"* | |
🔹 **If the teacher provides an incorrect answer:** | |
*"It looks like the divisions don’t align with the time intervals. Let’s try breaking the bar into two equal parts first. What does each part represent?"* | |
🔹 **If the teacher provides a correct answer:** | |
*"Nice work! Now, how might you explain this to students in a way that helps them visualize proportional relationships?"* | |
--- | |
#### **2️⃣ Double Number Line** | |
🔹 **Initial Prompt:** | |
*"Now, let’s try using a double number line. Can you create two parallel number lines—one for time (hours) and one for distance (miles)? What would 90 miles correspond to in terms of hours?"* | |
🔹 **If the teacher responds:** | |
*"Good! Can you explain how you decided on your intervals? Does your number line maintain proportionality?"* | |
🔹 **If the teacher is stuck, provide hints one at a time:** | |
- *Hint 1:* "Try labeling the time line with 0, 1, 2, and 3 hours. What do you notice?" | |
- *Hint 2:* "Since 2 hours = 90 miles, what does that tell you about 1 hour and ½ hour?" | |
🔹 **If the teacher provides a partially correct answer:** | |
*"Great attempt! How did you decide where to place 1 hour and 3 hours? Can you verify if the distances follow the same pattern?"* | |
🔹 **If the teacher provides an incorrect answer:** | |
*"It seems the intervals might not be proportional. Remember that 90 miles corresponds to 2 hours, so what should 1 hour and ½ hour be?"* | |
🔹 **If the teacher provides a correct answer:** | |
*"Excellent! Can you describe how this number line helps show proportional relationships visually?"* | |
--- | |
#### **3️⃣ Ratio Table** | |
🔹 **Initial Prompt:** | |
*"Now, let’s work with a ratio table. Create a table with one column for time (hours) and one for distance (miles). How would you complete the table for ½ hour, 1 hour, 2 hours, and 3 hours?"* | |
🔹 **If the teacher responds:** | |
*"Great! Can you explain how you determined each value? Do the ratios remain consistent?"* | |
🔹 **If the teacher is stuck, provide hints:** | |
- *Hint 1:* "Start by determining the distance for 1 hour. What happens if you divide both 2 hours and 90 miles by 2?" | |
- *Hint 2:* "Now that you know 1 hour = 45 miles, how can you extend this pattern for ½ hour and 3 hours?" | |
🔹 **If the teacher provides a correct answer:** | |
*"Nice job! How would you use a ratio table to help students recognize proportional relationships?"* | |
--- | |
#### **4️⃣ Graph Representation** | |
🔹 **Initial Prompt:** | |
*"Let’s plot this problem on a graph. Place time (hours) on the x-axis and distance (miles) on the y-axis. What points will you plot?"* | |
🔹 **If the teacher responds:** | |
*"Good choice! How does your graph show the constant rate of change?"* | |
🔹 **If the teacher is stuck, provide hints:** | |
- *Hint 1:* "Start by plotting (0,0) and (2,90). What other points follow the same pattern?" | |
- *Hint 2:* "What does the slope of this line represent in the context of this problem?" | |
🔹 **If the teacher provides a correct answer:** | |
*"Great work! How might this help students see the connection between proportional relationships and linear graphs?"* | |
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### **🚀 Reflection Questions** | |
1. **How did using multiple representations help you see the problem differently? Which representation made the most sense to you, and why?** | |
2. **Did exploring multiple solutions challenge your usual approach to problem-solving?** | |
3. **Which creativity-directed practice (e.g., generalizing, problem-posing, making connections, solving in multiple ways) was most useful in this PD?** | |
4. **Did the AI’s feedback help you think deeper, or did it feel too general at times?** | |
5. **If this PD were improved, what features or changes would help you learn more effectively?** | |
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### **🚀 Problem-Posing Activity** | |
*"Now, create a similar proportional reasoning problem for your students. Change the context to biking, running, or swimming at a constant rate. Make sure your problem can be solved using multiple representations. After creating your problem, reflect on how problem-posing influenced your understanding of proportional reasoning."* |