Unifix Cubes, Ten Assorted Colors, Set of 500 The Most Widely Used Math Manipulative in the World! Unifix provides children from preschool through the elementary grades with a hands-on experience in math exploration. Unifix Cubes, accessories, books, kits, and games provide hundreds of activities from early patterns through place value and fractions. Demonstrate number relationships, measurement concepts, and much more Ideal for ages 4+