This super set contains 156 rods numbered 1-12 made from FSC certified wood. Includes 24 'Number 1' rods and 12 each of 'Number 2-12' rods. 40 comprehensive workcards included (for addition, subtraction, multiplication & division) made from FSC certified paper. Answers are on the reverse of each card, including inverse relationships of the operations used. Each rod is color coded to represent a number. The rods can also be used for measuring exercises. Each rod measures between 1cm and 12cm long (numbers 1 to 12). Age: 3+.