7-5.12 Negative Rates

This is an adaptation of the OUR lesson of the same title. I have reworked the trajectories of a number of the questions as well as created interactive models to support student thinking. Special thanks to Jay Chow at Desmos for help with the start, stop, and reset interactions. Student Facing Goals I can solve problems that involve multiplying and dividing rational numbers. I can solve problems that involve negative rates. Lesson Narrative The purpose of this lesson is to introduce students to negative rates of change, which will become important when they start learning about linear functions in later lessons. Students apply their understanding of operating with signed numbers to solve problems in context. The first problem involves a fish tank that is being filled and drained. The second problem deals with historic voyages in a bathyscaphe (deep-sea submarine) and a high-altitude hot air balloon. When students reason quantitatively about what it means for a rate to be negative, they engage in MP2. The activities in this lesson involve more reading than most lessons. Be prepared to support students with unfamiliar words. Shout out to Susan von Oy for the check-in screen and Jay Chow for massive help with the CL for the run, stop, reset functions. Questions, concerns, suggestions, errors-- please let me know twitter: @sinpiover2, email: jeff@shosholoza.org Also, feel free to send a tip if this helped you out or if you just want to support this work! Venmo @Jeff-Holcomb-4

By Jeff Holcomb