Arithmetic Teacher (1966) Vol. 13, No. 6
THE ARITHMETIC TEACHER Volume 13, number6 OCTOBER 1966 An example of informal geometry: Mirror Cards Marion Walter Discovering precision Peter K. Gurau Rings and strings James E. Major Manipulative devices E. w. Hamilton A letter to parents about the "new mathematics" Sister Mary Petronia, S.S.N.D. Also, articles on ac
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