Arithmetic Teacher (1966) Vol. 13, No. 7
THE ARITHMETIC TEACHER Volume 13, number 7 NOVEMBER 1966 Use of items with coded numbers for measuring understanding of elementary mathematical concepts Marion Hartlein A rationale in the use of variables Roy D. Hajek A bee on a point, a line, and a plane Francis T. Sganga The number line in the junior high school Rona
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