3 years & up. This starter set will help children explore proportional relationships, compare fractions, and develop flexible mathematical thinking. The Fraction Blocks have 15 blocks for children to learn about the geometry, shapes, and fractions while matching and building. The 16 colorful Fraction Cubes will help children explore and compare fractions. Children will learn about the proportional relationships between one section and the whole as well as develop the mathematics flexible thinking. Set includes 31 blocks total.