POSTER PROBLEMS LAUNCH POSE A PROBLEM WORKSHOP POST, SHARE, COMMENT STRATEGIC TEACHER-LED DISCUSSION FOCUS PROBLEM: SAME CONCEPT IN A NEW CONTEXT
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1 POSTER PROBLEMS Rating Rate Plans Sixth Grade Poster Problem Expressions and Equations Students learn how to describe cell phone rate plans using symbolic expressions. Also, students interpret expressions explaining the rate plans of three fictional cell phone companies and make recommendations about which is the best for certain users. There is also a bit misleading advertising thrown into this problem for fun! Learning Objectives: Interpret and translate real-world situations into numerical expressions using variables. Write and evaluate numerical expressions involving wholenumber exponents, variables, and specific values. Evaluate expressions with various values of their variables utilizing the Order of Operations. Common Core State Standards for Mathematics: 6.EE - 1, 2a, 2c The way this works: one lesson in six phases LAUNCH Teachers set the stage by leading an introductory discussion that orients students to the context of the problem. POSE A PROBLEM Teachers introduce a mathematical way of thinking about the context and engage students in a preliminary approach that opens the door to the workshop phase. Day 1 Teacher Tune Up: Variable, Parameter, and Unknown. What s the Diff? How can focusing on expressions prevent students from rushing to answer-getting? WORKSHOP The workshop starts with a more challenging and more openended extension of the problem. In teams, students plan and produce mathematical posters to communicate their work. POST, SHARE, COMMENT Teams display their posters in the classroom, get to know other teams posters, and attach questions/comments by way of small adhesive notes (or similar). FLEXIBLE STRATEGIC TEACHER-LED DISCUSSION Teachers then compare, contrast and connect several posters. In the process they highlight a progression from a more basic approach to a more generalizable one. By doing this, teachers emphasize standards-aligned mathematics using studentgenerated examples. FOCUS PROBLEM: SAME CONCEPT IN A NEW CONTEXT Serving as a check for understanding, this more focused problem gives teachers evidence of student understanding. Day 2 SERP 2014!!! Rating Rate Plans - Sixth Grade Poster Problem!!!! 1
2 1. LAUNCH Engage students in a discussion about cell phones, text usage, voice usage and rate plans. You will want to lead the discussion to elicit ideas about: Per-text or per-minute charges Flat rate charges for a fixed number of text messages or call minutes per month. Overages and other additional charges and fees Ask the students to analyze a sample bill (Handout #1). Discuss cellular charges for text and voice calls. Guide students through the sample bill to understand and identify: What is the billing cycle? How many minutes did this person use for calls? How were the charges calculated? How many text messages were sent and received? How were the charges calculated? How would you describe the type of plan this person has? Unlimited? Pay-as-you-go? Other? In your opinion, is the bill expensive or not very expensive? Explain. Also, consider a discussion to help students think about how realistic numbers might be. For example, ask, Suppose you got a bill with 1000 texts for a month. Is that realistic? Is it even possible? [Yes is about 33. And some people easily send 33 texts a day.] Student Name: Rating Rate Plans 1 Sample Bill - Handout Mobile Services, Inc. Monthly Charges - Nov 1 thru Nov 30 Family Tree Plan 900 $69.99 Message More Plan 300 $30.00 Total Monthly Charges $99.99 Other Charges and Credits Voice Usage Summary - Family Tree Plan 900 Minutes Used 1076 overage $.10/min 176 $17.60 Messaging Summary - Message More Plan 300 Text/Instant Msg Incoming 185 SAMPLE Text/Instant Msg Outgoing 160 overage $.05/msg 45 $2.25 BILL Total Other Charges and Credits $19.85 Surcharges and Other Fees (512) Alexander Paul Wilksinson 1234 Telephone Lane Austin, TX Texas State Telecom Tax $5.93 Austin City Telecom Tax $ Service Fee $0.50 Federal Universal Service Charge $2.23 Total Surcharges and Other Fees $9.61 Total for (512) $ Sample Bill - Handout #1 SERP 2014!!! Rating Rate Plans - Sixth Grade Poster Problem!!!! 2
3 POSTER PROBLEMS - RATING RATE PLANS SLIDE #1 2. POSE A PROBLEM Show Slide #1. This phase of the lesson gets students accustomed to using algebraic expressions to compare monthly rate plans. Help students determine the meaning of m (number of minutes) and t (number of texts). Working together, put in sample values for the variables to better understand the formulas. For example, you could determine how much Mobile Services, Inc. would charge for 1,000 minutes and 500 texts. You will want to focus on how the formula is more complex when the user exceeds the base number of minutes or text messages. This concept should be familiar, however students are unlikely to have seen it expressed as a formula. Use Handout #2 to give individual or pairs of students practice at determining monthly costs for four sample customers with Mobile Services, Inc. rates. Mobile Services, Inc. Voice calls: Family Tree Plan 900 $69.99/month for 900 minutes What if you go over 900 minutes? $.10 per minute added to the standard $69.99 charge:!.1(m 900) POSTER PROBLEMS - RATING RATE PLANS SLIDE #1 Text messages: Message More Plan $30.00/month for 300 text messages What if you go over 300 text messages? $.05 per message added to the standard $30.00 charge:!.05(t 300) + 30 Slide #1 Answers to Handout #2: #1 Karyn 50 minutes voice, $69.99 Student Name: Rating Rate Plans 2 Sample Customers - Handout Instructions 100 text messages, $30.00 Total: $99.99 Here is how Mobile Services, Inc. calculates what to charge customers. Please determine how much Karyn, Nathan, Tara, and Matt would owe the company when they get their monthly bills. Mobile Services, Inc. Voice calls: Family Tree Plan 900 $69.99/month for 900 minutes What if you go over 900 minutes? $.10 per minute added to the standard Text messages: Message More Plan $30.00/month for 300 text messages What if you go over 300 text messages? $.05 per message added to the standard $69.99 charge: $30.00 charge:.1(m 900) (t 300) + 30 #2 Nathan 150 minutes voice, $ text messages, $30.00 Total: $99.99 Customer #1: Karyn Karyn uses 50 minutes on calls each month but sends twice as many text messages. Customer #2: Nathan Nathan uses 3 times the number of minutes Karyn uses each month. However, he doesn t send text messages at all. Customer #3: Tara On average, Tara uses 500 text messages every month and 200 minutes of talk time Customer #4: Matt Matt uses half the number of texts compared to Tara but his voice calls average 1000 minutes per month. #3 Tara 200 minutes voice, $ text messages, $40.00 Total: $ #4 Matt 1,000 minutes voice, $ text messages, $30.00 Total: $ #1: Karyn #2: Nathan #3: Tara #4: Matt Voice Charge Text Messages Charge Total Sample Customers - Handout #2 SERP 2014!!! Rating Rate Plans - Sixth Grade Poster Problem!!!! 3
4 3. WORKSHOP Slide #2 Show Slide #2. Ask, What can we determine about Transparent Technologies rate plan? Note: This company uses a flat fee (unlimited use). The monthly bill is always $ TRANSPARENT TECHNOLOGIES YOUR PHONE BILL SHOULD NEVER BE A SURPRISE! Show Slide #3. Ask, What can we determine about Commendable Communications rate plan? Slide # (t) + 0(m) Note: This company uses a fee structure that always charges $.10 per minute for voice and begins charging for individual text messages after 100. They also add a $6.99 fee each month. Commendable Communications POSTER PROBLEMS - RATING RATE PLANS SLIDE #2 Your first 100 texts are on us! Show Slide #4. Ask, What can we determine about Square Deal Media s rate plan? if t (m) Note: This company indeed offers the first text for the only half a penny; however, the cost of numerous texts would be astronomical due to the exponent in the formula. (For fun, let students discover the effect of the exponent on their own before you explain it to them). if t > (m) +.25(t 100) POSTER PROBLEMS - RATING RATE PLANS SLIDE #3 2 Slide #4 Each company makes a claim that may be true on the surface. But once the students analyze how each company determines their monthly fees, these claims may or may not hold up. SQUARE DEAL MEDIA Half a penny for your first text! How can you beat that? Show Slide #5. Challenge students: Create a display that analyzes the rate plans and compares the three companies. Be sure to include examples of what the charges would be for a variety of customers. Some might text more, talk for more minutes, etc. Your poster should help someone understand which rate plan would be the best choice for them. Slide #5 TRANSPARENT TECHNOLOGIES (t) + 0(m) POSTER PROBLEMS - RATING RATE PLANS SLIDE #4 Commendable Communications 0.005t 2 + 0(m) if t (m) if t > (m) +.25(t 100) SQUARE DEAL MEDIA 0.005t 2 + 0(m) POSTER PROBLEMS - RATING RATE PLANS SLIDE #5 SERP 2014!!! Rating Rate Plans - Sixth Grade Poster Problem!!!! 4
5 4. POST, SHARE, COMMENT Have students post their posters around the classroom. Encourage students to travel around to view the posters created by other groups. Students should be encouraged to pose questions to other groups by attaching a small adhesive notes to their posters. During this time, the teacher should be review all the posters and consider which to highlight during the Phase 5 discussion. Sample Posters: A Poster A displays three sample customers with different use patterns and lists the sums each should expect on the monthly bill. This group also provided a summary statement about the kind of customer who would benefit from the specific rate plan. Poster B shows the work of the calculations and uses sample users who provide a much more dramatic difference in costs. They also made a preliminary attempt to display data a graph. The graph is unlabeled, but is likely to be more illustrative than data-based. Notice that the graph for Square Deal is not curved. Poster C focuses on the skyrocketing of the texting charge with Square Deal s rate plan. B C Poster D compares all three plans, showing the effect of increasing the number of minutes for a small fixed number of texts (left) and increasing the number of texts for a small fixed number of minutes (right). This shows ingenuity and understanding, even though the curve for Square Deal does not go up as fast as it should! SERP 2014!!! Rating Rate Plans - Sixth Grade Poster Problem!!!! 5 D
6 5. STRATEGIC TEACHER-LED DISCUSSION Facilitate a discussion about why the best plan for a user depends on that particular person's calling and texting habits. Select a sequence of posters to use during the teacher-led discussion that will help move all students from their current thinking (often Levels 1 3 below) up to Level 4 or 5. Level 1: Calculations show final results but don t show how the student got there. In particular, the work may not yet connect the algebraic expressions to each company's billing approach. Level 2: Students makes generalizations with limited data. They do not reliably select sample customers to give a bigger picture. Level 3: Students coordinate both the voice and messaging charges and intentionally create sample customers to highlight how changing the voice minutes and text messages change the final bill. Level 4: Students use multiple representations to illustrate break-even points and how particular patterns of use affect the bill. Level 5: Patterns, relationships, and well-articulated caveats are explained with mathematics. Students articulate the absurdity of using an exponent in a rate plan. They demonstrate visually how dramatic (and Draconian) its increases are. Additional advances in mathematical thinking to press for during the discussion: We use variables in different ways. One traditional type of algebra problem presents students with an equation to solve, such as 2x + 3 = 7. The student learns to isolate x to solve the equation, and get the answer, x = 2. In this activity, however, we don t need to solve equations. Instead, we present students with expressions that contain variables. The students have to find and compare the values of these expressions (the total monthly cost) for different values of the variables (the number of minutes and texts). The students do more plugging in than solving but it s plugging with a purpose : the expressions describe something real (the rate plans) using symbolic mathematics, and the students try different values in order to uncover the patterns behind the mathematical expressions. The underlying purpose is to find the best plan, where best depends on how you use your phone. Key idea: A variable is a letter that can take on different values within a particular expression, equation, or situation. A graph shows us, visually, the relationship between two quantities. Traditionally, the dependent or response variable goes on the vertical axis, and we often label it y. The independent or predictor variable goes on the horizontal ( x ) axis. But what do you do when you have two predictors (in this activity, talk minutes and texts)? One strategy is to hold one variable constant. For example, you could make a graph of how the cost depends on the number of texts, given that you talk for 500 minutes. (See Poster D at Step 4.) Key Idea: 2-D graphs show relationships between two variables. With some creativity, however, you can explore three or more variables, as long as you look at only two at a time. SERP 2014!!! Rating Rate Plans - Sixth Grade Poster Problem!!!! 6
7 6. FOCUS PROBLEM: SAME CONCEPT IN A NEW CONTEXT Display Slide #6. Ask students to talk to a partner to become familiar with the table. Ask several students to share information that they noticed. Food truck and restaurant prices differ. All the prices within a category are the same at each location. At the close of the strategic teacher-led discussion with the students, distribute Handout #3 to help determine whether students can use their experience with the rate plans to formulate an algebraic expression for the total amount a family would pay at their favorite eatery. Answers to Handout #3: 1. 8e + 5s + 2b is the expression for the food truck Kasa Indian Eatery Entrees! Chicken Tikka! Lamb Curry! Gobi Aloo (Vegetarian) Sides! Pappadum! Daal! Samosa Beverages! Chai! Lassi! Soda POSTER PROBLEMS - RATING RATE PLANS SLIDE #6 Food Truck Prices Restaurant Prices $8 $15 $5 $9 $2 $3 Slide #6 15e + 9s + 3b is the expression for the restaurant The prices are shown as coefficients in the expressions. Student Name: Rating Rate Plans 3 From Rate Plans to Restaurants - Handout 2. Food truck 8(5) + 5(6) + 2(6) $82.00 (plus tax and tip?) Kasa Indian Eatery Food Truck Prices Restaurant Prices Entrees $8.00 $15.00 Chicken Tikka Lamb Curry Gobi Aloo (Vegetarian) Sides $5.00 $9.00 Pappadum Daal Samosa Beverages $2.00 $3.00 Chai Lassi Soda Restaurant 15(5) + 9(6) + 3(6) Instructions Trey s family loves eating at Kasa. Sometimes they eat at the restaurant and sometimes they go to Kasa s food truck and eat in a park. Either way, they use algebraic expressions to know what they will have to pay. Variables: e = number of entrees ordered s = number of sides ordered b = number of beverages ordered $ (plus tax and tip?) 1. 8e + 5s + 2b 15e + 9s + 3b Is this expression for the Is this expression for the food truck or the food truck or the restaurant? restaurant? How do you know? How do you know? 2. Use the expressions to find out how much Trey s family would pay if they ordered the meal marked on the menu above at the food truck. Then do the same for the restaurant. 3. Encourage the use of an expression that can be used regardless of the number of items ordered. (prices as coefficients and numbers of the entrees, sides, and beverages each as variables) 3. Finally, change all the prices at Kasa. Write new expressions that could be used for your new prices From Rate Plans to Restaurants - Handout #3 SERP 2014!!! Rating Rate Plans - Sixth Grade Poster Problem!!!! 7
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