Koplow Games Math Numbers 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, one die each of (0-5), (5-10), (1-6), (7-12), (13-18), (19-24), (25-30), and (1-3 twice).