A great resource for hands on learning, Cuisenaire Rods are perfect for maths. Cuisenaire Rods are a collection of rectangular rods, each of a different color and size. The smallest rod is one centimeter long and the longest rod is 10 centimeters long. 5 of the '1' blocks are equal height to the '5' block, and so forth. Great for learning addition and subtraction in a tangible way.