Green Monsters, Red Monsters Part 1

Green Monsters, Red Monsters Part 1 is a Grade 7 probability activity that uses a small deck of red and green monster cards to compare independent and dependent events. Students begin by finding simple probabilities from the full deck, then examine what changes when a card is removed before the second draw. The color model makes the changing sample space visible and gives students a concrete way to reason about without-replacement probability.

Use it in a small group when students are ready to move beyond single-event probability and discuss how one event can affect the next. Ask students to predict whether a probability will increase or decrease before calculating it. Create a free Find a Math Game account to generate teacher-ready lesson support for Green Monsters, Red Monsters Part 1. No credit card is required, and the free account includes 3 lesson generations for life.