The Montessori material of mathematics makes children familiar with individual numbers and numeric operations in a very factual and exemplifying way and develops their understanding of mathematic progression. This material has its own method. We always proceed from concrete things to abstract ones, from the simplest to more complicated, from known things to unknown ones. Children learn to feel basic principles of the numeric world with all their senses. When counting steps while walking or arranging blue and red bars from the shortest to the longest one, they learn that maths is present everywhere around us.