Set of 500 cubesnMath made easy-Great for counting to 100 by ones and tens, grouping, and one-to-one correspondencenCubes link together on all sides of each cube with circle shape cutoutsnCan fit in Unifix apparatus and materialsnIdeal for ages 5+nHelp young students master early math skills with these stackable cubes. This set of 500 plastic cubes link together on all sides with circle shape cutouts. Easy for little hands to connect and twist apart.