Discovering meanings in arithmetic / Foster E. Grossnickle [and] Leo J. Brueckner. Grossnickle, Foster E. (Foster Earl), 1896- Brueckner, Leo J. (Leo John), 1890-1967, joint author. Brueckner, Leo J. (Leo John), 1890-1967. Making arithmetic meaningful. Arithmetic Study and teaching. QA135 .G756 510.7 GRD Includes index. New York Winston c1959 c1959 1959 Text v, 442 p. : eng