(Grades 5 & up). Original-style 24 game. Add, subtract, multiply, divide, to make 24 using numbers 1 through 24. Use all four numbers on the card, but use each only once. Designed to improve basic math skills. Contains 96 double-sided cards that offer three degrees of challenge. Primer edition cards have a self-check feature on the reverse side, allowing students to check answers and see alternate solutions.