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A number balance, a mathematical teaching aid, unsigned probably English, c.1985.
A number balance, a mathematical teaching aid, unsigned, probably English, c.1985. Following the work of pioneers such as Maria Montessori and Caleb Gatengo, items which illustrated number physically were increasingly introduced into classrooms during the 20th century.
A number balance, a mathematical teaching aid, unsigned probably English, c.1985.
Selection of 9 blue number weights for number balance, a mathematical teaching aid, unsigned probably English, c.1985.
