Addition? Subtraction? Easy! Melissa & Doug designed and quality made a terrific visual math toy for preschoolers, or even toddlers! Add & Subtract Abacus Math Learning Toy is a wooden counting toy that comes with 10 arched color-coordinated rows of beads. This first math tool comes with 2 double-sided boards. These inserts present addition diagram and subtraction as colorful columns of beads on the clearly illustrated diagram. Flip the counting beads and see how many you add or subtract from each abacus row. Add & Subtract Abacus Math Learning Toy brings ingeniously visual element to kids' learning of math operations. This math learning toy from Educational Toys Planet is a must-have for home or preschool play room.