Students are presented with multiple opportunities and approaches to practice classifying and analyzing the relationship between sets and subsets of real numbers in this 3 page activity. On the first page, students are given the definitions and names of each subset of real numbers, and are asked to match the subset to its definition. On the second page, students are asked to classify 7 real numbers by all appropriate subsets, and then place them correctly in the real number graphic organizer. On the third page, students are given 6 true/false statements about the relationship between number sets, and are asked to completely label the real number graphic organizer again.