This great activity can be used by all grades alike! It investigates the properties of rate of change using a tootsie pop. The file can be modified a bit to accommodate grade 9 students (applied/academic) and is very applicable when discussing rates of change and slope. The intent of this assignment is to be used for grade 12 advanced functions to explore IROC and AROC using estimation. Students work in pairs to complete the task before the end of class.
Additional materials not include in this file: paper version of a ruler with cm and mm on it (can be easily found online). This was a good idea to use to keep the project hygienic.