Koplow Games Math Operators Dice Set is a fun, hands-on way for students to learn basic math operation. 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 6 white opaque operator dice and feature symbols for addition, subtraction, multiplication, division, greater than/less than and equal to ( + , - , x , ÷ , > , < , = ). Sold as 6 sets for a total of 36 dice. Recommended age 3+ years