Learning Resources Cuisenaire Rods Plastic Connecting Classroom Set. This numeracy resource set from Learning Resources has enough rods for 12-18 students to use together. Rods come in ten different sizes from 1cm to 10cm and feature ten different colours. Each colour represents a different length. Cuisenaire Rods can be used to reinforce a variety of maths skills such as addition and subtraction, fractions and decimals, geometry and measurement and patterns and algebra. This set of rods comes in a handy storage trays and includes a teachers guide. Suitable for ages 4+