University of Texas
Inside Mathematics: Truffles [Pdf]
This task challenges a student to demonstrate understanding of ratios and proportions. Students must determine a generalized rule from an understanding of ratio and proportional reasoning in a given real-world context.
PBS
Pbs Mathline Lesson: Mix It Up [Pdf]
A lesson based on the story, "Oliver's Fruit Salad," where young scholars explore the concept of proportional reasoning through modeling, student sharing, and questioning. A great introductory lesson for this concept that is sure to...