Learning numbers and basic math has never been this much fun. This colorful set of math puzzle cards provides children with an excellent introduction to number recognition, counting and basic addition and subtraction. the 30 puzzle cards fearure 10 cards of counting, 10 cards of addition and 10 cards of subtraction. The puzzles are self-correcting - only cards with the correct answer will fit together. A fun way to learn basic mathematics. Recommended for ages three and up.