Learning Resources Cuisenaire Rods Small Group Set (Set of 155). This colourful has just enough rods for small group use – perfect for 4-6 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 small group set is ideal for reinforcing skills such as addition and subtraction, fractions and decimals, geometry and measurement and patterns and algebra. This set of 155 rods comes in a handy storage tray and includes a teacher’s guide. Suitable for ages 4+