This document outlines a lesson plan on classifying rational and irrational numbers. It includes a pre-test for students to determine if example numbers are rational or irrational. The lesson then covers key concepts like different forms of rational numbers as decimals, fractions, and square roots. Students work in groups to organize numbers on a poster as rational with terminating decimals, rational with repeating decimals, irrational and non-repeating decimals. A post-test reviews the concepts and has students determine the rationality of additional numbers, explaining their reasoning.