Date ARITHMETIC They can use both on subject materials, and on special loose printed pages.

Where exercise In childrens groups of the House of Maria Montessori in Moscow, at free schools of France was applied.

Date ARITHMETIC SIGNS Age years The exercise purpose Ability to make examples on various arithmetic actions.

Material A box with two offices, in one of which plastic or cardboard plates are put with the image of figures from to , and in other plastic signs +, it is more, it is less.

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