Dr Maria Montessori developed and designed mathematically precise materials that are now known as Montessori Materials. All Montessori Materials are constructed on these basic principles: meaningfulness to the child, the isolation of the difficulty in a single material, materials that progress from simple to complex, materials that prepare indirectly for future learning, materials that begin as concrete expressions and graduate to the abstract.

These developmental materials are organized into five basic categories:

• Practical Life
• Sensorial
• Mathematics
• Language
• Culture