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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?** | |
- **ยฝ hour?** | |
- **3 hours?** | |
๐ก **We will explore different representations to deeply understand this problem.** | |
๐ก **I will guide you step by stepโletโs take it one method at a time.** | |
๐ก **Try solving using each method first, and I will help you if needed.** | |
*"Let's begin! We'll start with the first method: the **bar model**."* | |
--- | |
### **๐ Step 1: Bar Model** | |
๐น **AI Introduces the Bar Model** | |
*"Let's solve this using a **bar model**. Imagine a bar representing 90 miles over 2 hours. How would you divide this bar to find the distances for 1 hour, ยฝ hour, and 3 hours?"* | |
๐น **If the teacher provides an answer:** | |
*"Nice! Can you explain how you divided the bar? Does each section match the correct time intervals?"* | |
๐น **If the teacher is stuck, AI gives hints one by one:** | |
- *Hint 1:* "Try splitting the bar into two equal parts. Since 90 miles corresponds to 2 hours, what does each section represent?" | |
- *Hint 2:* "Now that each section represents 1 hour, what about ยฝ hour and 3 hours?" | |
๐น **If the teacher provides a correct answer:** | |
*"Great job! You've successfully represented this with a bar model. Now, let's move on to a **double number line**!"* | |
--- | |
### **๐ Step 2: Double Number Line** | |
๐น **AI Introduces the Double Number Line** | |
*"Now, let's explore a **double number line**. Draw two parallel linesโone for time (hours) and one for distance (miles). Can you place 90 miles at the correct spot?"* | |
๐น **If the teacher provides an answer:** | |
*"Nice work! How do your markings show proportionality between time and distance?"* | |
๐น **If the teacher is stuck, AI gives hints:** | |
- *Hint 1:* "Mark 0, 1, 2, and 3 hours on the time line." | |
- *Hint 2:* "If 2 hours = 90 miles, what does that mean for 1 hour and ยฝ hour?" | |
๐น **If the teacher provides a correct answer:** | |
*"Great! Now that we've visualized the problem using a number line, let's move to a **ratio table**!"* | |
--- | |
### **๐ Step 3: Ratio Table** | |
๐น **AI Introduces the Ratio Table** | |
*"Now, letโs use a **ratio table**. Set up two columns: one for time (hours) and one for distance (miles). Try filling it in for ยฝ hour, 1 hour, 2 hours, and 3 hours."* | |
๐น **If the teacher provides an answer:** | |
*"Nice job! Can you explain how you calculated each value? Do the ratios remain consistent?"* | |
๐น **If the teacher is stuck, AI gives hints:** | |
- *Hint 1:* "Start by dividing 90 miles by 2 to find the unit rate for 1 hour." | |
- *Hint 2:* "Once you find the unit rate, use it to calculate ยฝ hour and 3 hours." | |
๐น **If the teacher provides a correct answer:** | |
*"Excellent! Now, let's move to the final methodโ**graphing** this relationship."* | |
--- | |
### **๐ Step 4: Graph Representation** | |
๐น **AI Introduces the Graph** | |
*"Finally, let's plot this on a **graph**. Place time (hours) on the x-axis and distance (miles) on the y-axis. What points will you plot?"* | |
๐น **If the teacher provides an answer:** | |
*"Great choice! How does your graph show the constant rate of change?"* | |
๐น **If the teacher is stuck, AI gives hints:** | |
- *Hint 1:* "Start by plotting (0,0) and (2,90)." | |
- *Hint 2:* "Now, what happens at 1 hour, ยฝ hour, and 3 hours?" | |
๐น **If the teacher provides a correct answer:** | |
*"Fantastic work! Now that we've explored different representations, let's reflect on what we've learned."* | |
--- | |
### **๐ Summary of What You Learned** | |
๐ก **Common Core Practice Standards Covered:** | |
- **CCSS.MP1:** Make sense of problems and persevere in solving them. | |
- **CCSS.MP2:** Reason abstractly and quantitatively. | |
- **CCSS.MP4:** Model with mathematics. | |
- **CCSS.MP5:** Use appropriate tools strategically. | |
- **CCSS.MP7:** Look for and make use of structure. | |
๐ก **Creativity-Directed Practices Covered:** | |
- **Multiple solutions:** Using different representations to find proportional relationships. | |
- **Making connections:** Relating bar models, number lines, tables, and graphs. | |
- **Generalization:** Extending proportional reasoning to different scenarios. | |
- **Problem posing:** Designing a new problem based on proportional reasoning. | |
- **Flexibility in thinking:** Choosing different strategies to solve the same problem. | |
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### **๐ 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 AIโs 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?** | |
--- | |
### **๐ 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."* | |
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