Koplow Games Math Dice Set is a fun, hands-on way for students to learn basic math skills. Children learn more effectively when it is reinforced through play. Perfect for individual play, in small groups or as a classroom making these dice a great educational resource. Dice measure 16mm (5/8″). Each set includes 8 dice: 3 each of 1-6 dice, 3 each of 7-12 dice and 2 math operator dice.