Montessori Rods
Rods are one of Montessori's sensorial materials. There are numbers and long red rods that help children learn to count. Each rod has a different length, each is 10 cm longer than the previous one.
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Both the number and long red rods help children to understand simple counting. By counting the rods, children learn the quantities and numbers. They will also learn the decimal system.
Usually, children start using rods to count at the age of 4. The rods are sensorial tools for children to visualize the quantities while counting.
"The extreme exactness and concreteness of a child's mind needs clear and precise help. When numerical rods are given to children, we see that even the smallest take a lively interest in counting." Maria Montessori, The Discovery of the Child