1. Grow Beasts: Growing students’ understanding of ratio, proportions and slope School Science and Mathematics Association 2009 Annual Convention October 22-24 Reno, Nevada Dr. Mark Roddy Seattle University

2. Objectives: Session Participants will build understanding of: an application of data gathering, prediction, slope, linear (and non- linear) rates of change; the use of inquiry to engage students in the construction of understanding and skill; the role of positive disposition in the development of understanding and skill. Participants will be invited to join a Web-based network of teachers using this investigation. Grow Beasts: Growing students’ understanding of ratio, proportions and slope

3. Simulated Grow Beasts

4. Here are your three GBs: A was grown in a medium salt solution (10cc/200ml) B was grown in warm water (~32 o C) C was grown in room temperature water (~26 o C) HOURS elapsed Med SaltWarm WaterJust Water begin 10AM 10/8/08 10cc/200ml32 degrees C26 degrees C 0 4.34.24.1 1 4.34.44.3 2 4.74.5 4 5.24.8 6 4.66.05.4 8 4.76.86.0 10 12124.97.46.4 12 5.08.46.9 14 5.08.97.2 22 5.311.08.1 24 5.311.58.3 28 5.412.18.7 32 5.412.59.1 37 5.612.99.4 48 5.713.610.1 50 5.813.910.3 56 5.814.210.6 62 5.814.610.9 72 5.814.811.0 ABC Grow Beasts: warm water, water, and salt water ABC

5. ABC B C A

6. Three Grow Beasts: salt, lemon, water

7. Using Grow Beasts to Teach Math 5 th grade: measurement 6 th grade: ratio and rate 7 th grade: rates of change, slope and linear equations 8 th grade: more linear functions and the analysis and summary of data sets

8. Grow Beasts: Growing students’ understanding of ratio, proportions and slope School Science and Mathematics Association 2009 Annual Convention October 22-24 Reno, Nevada Dr. Mark Roddy Seattle University