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 positive dice, 3 negative dice and 2 math operator dice. Sold as 6 sets for a total of 48 dice.