PARTITION AND ITERATION
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1 PARTITION AND ITERATION Nick Wasserman Marymount School of New York Ph.D. Candidate, Teachers College, Columbia University AMTNYS Annual Conference Saratoga Springs, NY
2 LINEARITY Take a few moments and consider how you d respond: What are the important ideas for understanding linear relationships? What are the fundamental notions behind linearity? What are the main assumptions of linear models?
3 LINEARITY Take a few moments and consider how you d respond: What are the important ideas for understanding linear relationships? What are the fundamental notions behind linearity? What are the main assumptions of linear models? What are common points of confusion for students?
4 BUCKET If a basketball team scores points in the first half, how many do they score in the second? If one state gets senators, how many do other states get? If someone s salary is $, in January, how much is received in other months? If a state with million people has five congressmen, how many should a state with million people have?
5 VOCABULARY Slope Rate of Change How are these ideas intuitive for understanding linearity? How are these helpful for relating to the numerical value? How could these words be confusing for students? Teuscher and Reys () give evidence that students misunderstand these two ideas, and have difficulties conceptualizing and connecting them.
6 PARTITION even even even even even even
7 ITERATION Stage Number = Stage Number = Stage Number = B B D E D E A F C F C
8 PARTITION AND ITERATION: MODELING LINEARITY Partition Division Iteration Multiplication These basic ideas match the top broad categories behind understanding linear assumptions: namely, equal partitions and constant repetition (bucket analogy). If these represent two fundamental concepts for linearity, we can intentionally point students to see these connections in linear relationships.
9 CONVERSION One Euro is equal to $.7 in U.S. dollars. How much are,,,,,, or Euros worth in U.S. dollars?
10 CONVERSION One Euro is equal to $.7 in U.S. dollars. How much are,,,,,, or Euros worth in U.S. dollars? $
11 CONVERSION One Euro is equal to $.7 in U.S. dollars. How much are,,,,,, or Euros worth in U.S. dollars? $ a=.7 a=.7+.7 a= an=
12 CONVERSION A package weighs kilograms, or. lbs. What does a onekilogram package weigh in lbs? kgs lbs.
13 CONVERSION A package weighs kilograms, or. lbs. What does a onekilogram package weigh in lbs? kgs lbs.
14 CONVERSION A package weighs kilograms, or. lbs. What does a onekilogram package weigh in lbs? kgs lbs.
15 CONVERSION A package weighs kilograms, or. lbs. What does a onekilogram package weigh in lbs? kgs lbs kgs lbs
16 DRIVING TO NYC After driving four hours a car is miles away from NYC and after driving seven hours it is miles away from NYC. Assuming a constant speed, how far away did the car begin its trip? time distance 7
17 DRIVING TO NYC After driving four hours a car is miles away from NYC and after driving seven hours it is miles away from NYC. Assuming a constant speed, how far away did the car begin its trip? time distance 7 partition
18 DRIVING TO NYC After driving four hours a car is miles away from NYC and after driving seven hours it is miles away from NYC. Assuming a constant speed, how far away did the car begin its trip? time distance 7 iteration partition
19 DRIVING TO NYC After driving four hours a car is miles away from NYC and after driving seven hours it is miles away from NYC. Assuming a constant speed, how far away did the car begin its trip? time distance time distance 7 iteration partition
20 A BABY S WEIGHT A baby weighs.8 lbs at birth and at months the baby weighs.8 lbs. How much does the baby weigh at,,, and months? How much will the baby weigh at years? Discuss how the notions of Partition and Iteration might model students thought processes.
21 A BABY S WEIGHT A baby weighs.8 lbs at birth and at months the baby weighs.8 lbs. How much does the baby weigh at,,, and months? How much will the baby weigh at years? Discuss how the notions of Partition and Iteration might model students thought processes. Collection 8 Scatter Plot Collection 8 Scatter Plot Collection 8 Scatter Plot age 7 age weight =.age +.8; r =. 7 age weight =.age +.8
22 LOSING WEIGHT Betty has been on a weight loss program for the last months. Seven months after starting the program her weight was lbs, and today (at months) she weighs 9 lbs. Assuming a constant rate of change, model and describe her weight over the past year. Discuss how the notions of Partition and Iteration might model students thought processes. Write a linear equation that tracks her weight over time.
23 GENERALIZING x -x months weight y -mx y -y y = (y " mx ) + mx
24 CONCLUSIONS A frequent disconnect What does a slope of / mean? Rise of, Run of?
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