Extend the impact of your 20-bead rekenrek with these unique rekenrek plastic dominoes! Ideal for building number sense through subtilizing and visualizing number relationships. Includes instructions for two fun educational games (dominoes & domino war). perfect math manipulative for Grades K-2 & 2-4 players. For over 50 years, hand2mind has encouraged hands-on learning and discovery, driving deeper understanding and helping children unlock their full potential. Hand2mind specializes in math manipulatives designed to help students learn by doing. They supply math counters, rekenreks, abacus, counting cubes and more to help little ones go from counting to 10, 20 and beyond! From early math to middle school math, hand2mind has you covered with products designed to enhance learning in the classroom and the world around us. Through hands-on exploration and discovery we strive to find new ways to encourage students in math practice, literacy activities, STEM education and more!