Arithmetic Teacher (1969) Vol. 16, No. 6
r An officia l journal of THE NATIONAL COUNCIL OF TEACHERS OF MATHEMATICS OCTOBER 1969 Volume 16, Number 6 Research on mathematics education, grades K~8, for 1968 C. Alan Riedesel and MarilynN. Suydam Sugar-cube mathematics Jon L. Higgins Informal geometry through symmetry J. Richard Dennis Geometry all around us-K-12
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