This PDF includes five two-page checkpoints/quizzes/homework assignments covering high school level probability. Each contains key bullet points and formulas as well as a variety of multiple choice, FITB, matching, numeric, and free-response questions to scaffold learning (about 50 total questions). A key with solutions is included. Topics include events, unions, intersections, frequency tables, conditionals, and mutually exclusive and inclusive events.Checkpoint 1: Basic probability, events, co