Checks understanding of the union, complement, and intersection of sets. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.

This page provides a good explanation of unions of sets in mathematics. It discusses the union of disjoint sets and the probabilities of unions, incorporating probabilities of the two independent sets and their intersection. Discusses...

Find a quick, concise explanation of operations on sets. Examples are given and clearly explained.

Introduces the basic terminology of Venn diagrams, and shows how to "populate" and read Venn diagrams.

Test your knowledge of sets, union, intersection, complements and Venn diagram by taking this practice test. Five levels are provided and it also tracks the number of correct and wrong answers.

This site has many links to examples of inverse functions, including intersections, inverse by reflection, and graphing inverse functions.