Learning Resources Interlocking Plastic Cuisenaire Rods Introductory Set (Set of 74). This set from Learning Resources has just enough rods for small group use – perfect for 2-3 children. Cuisenaire Rods come in ten different sizes and colours, measuring from 1cm to 10cm. Each colour represents a different length for easy recognition. This introductory set is ideal for reinforcing skills such as addition and subtraction, fractions and decimals, geometry and measurement and patterns and algebra. This set of 74 rods comes in a handy storage tray and includes a teachers guide. Suitable for ages 4+