ETA Cuisenaire Rods Set Of 74 - s10299 Math Manipulatives. Rods are very gently used, Easy to clean plastic. 7 sets available . Save on shipping and can make a deal on more than 1 set purchased. Cuisenaire Rods help students relate abstract ideas about numbers and shapes to something students can see and touch. They make mathematical ideas easier to internalize and frequently allow students to understand and solve problems they might not otherwise be able to solve. Provide endless opportunities to introduce, investigate, and reinforce key math topics such as addition, subtraction, geometry, measurement, multiplication, and division. Each color and rod corresponding to a specific length from 1 centimeter to 10 centimeters — orange-10 cm, blue-9 cm, brown-8 cm, black-7 cm, dark green-6 cm, yellow-5 cm, purple-4 cm, green-3 cm, red-2 cm, white-1 cm