Math is a very important subject in the Montessori classroom. Children are exposed to numerals, quantity, and symbols as well as odd/even. The Math materials are very concrete, in order to meet the needs of various types and styles of learning, offering the child a stable foundation for math in the future. The Decimal System then comes in to play with an understanding of the foundation of complex numbers leading us to tens, teens and beyond. Once the child masters the Decimal System, operations and functions begin to take place such addition, subtraction, multiplication, division and fractions.