You'll need scissors, glue sticks, and mini whiteboards for this activity on rational and irrational numbers. Learners work in groups to classify a variety of expressions as rational or irrational. They are also given a mock discussion about an expression and must explain why they agree or disagree with each part of the conversation. The detailed lesson plan includes worksheets, PowerPoint, helpful suggestions, and an in-depth answer key. Learners must be familiar with the definitions of rational and irrational numbers before beginning.