The Learning Resources Numberblocks Addition and Subtraction Puzzle Set introduces children to early math fundamentals through play. Featuring the popular characters from the Numberblocks series, counting becomes visual and tangible. The set includes 20 colorful, self-correcting puzzles made of sturdy cardboard, which teach counting as well as simple addition and subtraction problems. Thanks to the clever design, each puzzle piece only fits in the mathematically correct spot, allowing for independent error correction. The easy-to-handle pieces also naturally support fine motor skills and color recognition.