For grades k-6 Made of durable practice Unifix cubes set of 100 The most popular manipulative for counting, operations, patterns and more! Unifix Cubes were invented by Charles Tacey in 1953. What is unique about them is that they are square and don't roll off students' desks like Poppet Beads. Montessori Math material: Unifix cubes that effortlessly interconnect on each side, complemented with geometric cutouts, enabling advanced pattern-making activities. School readiness: Encourage readiness for school through activities that foster mathematical competencies like counting, addition, and subtraction. Perfect for both homeschooling and traditional classroom settings!