TY  - BOOK
AU  - Marks,John L.
AU  - Purdy, C. Richard 
AU  - Kinney, Lucien B.
TI  - Teaching arithmetic for understanding
T2  - McGraw-Hill series in education. Curriculum and methods in education
AV  - QA135 .M313
U1  - 372.7 
PY  - 1958///
CY  - New York
PB  - McGraw-Hill
KW  - Arithmetic
KW  - Study and teaching
N1  - Includes references
ER  -