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Montessori materials are NOT toys, but educational materials. Proper use requires appropriate training.
Montessori materials may contain small, rough, sharp, or other elements that could cause injury or damage if used improperly.
It may therefore only be used by children under the supervision of appropriately trained persons and in an appropriate environment.
A set of models in which the colors green, blue and red make the structure of the square root drawing visible with one, two, three and four-digit numbers. The material supports the child in potentiating and rooting.