– 10 red rods differing in one dimension – length (from 10cm to 100cm). The unit of difference between each rod is 10cm.
Directly, they help children develop their visual discrimination. Indirectly, they are preparation for bigger math to come. The Red Rods are a materialized abstraction in the dimension of length. Montessori is all about moving from concrete to abstract, so accordingly, the Red Rods help a child visually discriminate differences in length, from 10cm to 100cm.