# Making sense of relationships through modeling - PowerPoint PPT Presentation

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Making sense of relationships through modeling. Roger Day Glencoe McGraw-Hill School Mathematics Tami S. Martin Illinois State University. Modeling as a tool for reasoning and sense making. Determine relationships among quantities. Make meaningful use of symbols to describe relationships.

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Making sense of relationships through modeling

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## Making sense of relationships through modeling

Roger Day

Glencoe McGraw-Hill School Mathematics

Tami S. Martin

Illinois State University

### Modeling as a tool for reasoning and sense making

• Determine relationships among quantities.

• Make meaningful use of symbols to describe relationships.

• Use families of functions to help connect context with the mathematics.

• Connect contexts with algebraic representations.

• Explore situations that lead to multiple, connected representations, and the interpretation of those representations through connections back to a context.

### Paper Scraper

• Paper Scraper: how-to video; example video

• What’s the connection between the number of cards used and the number of levels completed?

• Words

• Tables

• Symbols

• Graphs

• What other relationships could be explored?

### Remove the Twos

• Scramble 60 dice in a container and roll them out on the table. Count and remove all the 2s you see. Now repeat the scramble and roll.

• Keep track of the number of dice that remain after each roll. Create a table of values (roll number, dice remaining after roll), create a scatter plot of those values, and generate an algebraic representation for your data.

• Explain how your representations connect with the context of the problem.

• Have on hand several identical bags—weight and variety—of unpopped microwave popcorn and a microwave oven.

• Microwave one bag for exactly 60 seconds. Open the bag and record the number of popped kernels.

• Repeat the previous step for subsequent 10-second intervals (70 sec, 80 sec, and so on), each time recording the elapsed time and the number of popped kernels.

• You should now have a set of ordered pairs, relating elapsed time with the number of popped kernels of corn.

• Create a scatter plot of (elapsed time in seconds, number of popped kernels).

• Examine your scatter plot, What family of functions looks to be an appropriate model for your data? Can you connect the context of the problem with that function family?

• What other relationships might be explored using these data and this context?

### Water Flow

• Fill a 2-liter bottle with water. Using a bottle cap with a hole in it, turn the bottle upside down and record the amount of water out of the bottle, in ml, as time passes, in seconds.

• Create a scatter plot of (sec, ml) and generate an algebraic representation for your data.

• To what family of functions does this relationship belong? Can you justify that based on your knowledge of such functions and the context of the problem?

### Discussion

• What are the key elements of reasoning and sense making that you can drawn upon or emphasize using modeling activities in your classroom?

• What actions will you take as a teacher to ensure that the modeling process engenders student thinking and sense-making?

### Discussion

• What challenges to teaching and learning emerge when we engage students in modeling activities such as these?

• What are two or three actions you can take to begin (or increase!) implementation of modeling activities in your courses?

## Contact Info

Roger Day: dayr@pontiac.k12.il.us

Tami S. Martin: tsmartin@ilstu.edu