This resource focuses on helping students categorize numbers into various subsets such as natural, whole, integer, rational, and irrational numbers. It includes clear definitions for each category, guiding students to understand the hierarchy within the real number system. The activity encourages collaboration, observation, and classification through hands-on interaction with number cards. Students will work in pairs to identify patterns among numbers, organize them into meaningful groups, and justify their classifications based on the established definitions. The resource concludes with a reflective closing question that prompts students to think critically about the relationships among different sets of numbers.