Lesson objective: Apply using theoretical probabilities to make predictions about quantities.
This lesson provides an opportunity for students to apply their knowledge and understanding of theoretical probabilities to a spinner game choice situation. Students are asked to analyze which spinner will give Susan the best chance of winning at least 40 prize tickets.
Key Concept students will use:

The probability of a simple event is the same as the ratio of the number of favorable outcomes to the number of possible outcomes. This may be expressed as a decimal between 0 and 1, with 0 being impossible, and 1 being certain to occur.
Skills students will use:
 calculating theoretical probabilities
 proportional reasoning (grade 7, unit 2)
Students engage in Mathematical Practice 4 (Model with mathematics) as they model the realworld analysis of two spinners using probability and proportional reasoning.
Key vocabulary: