TY  - BOOK
AU  - 
AU  - 
ED  - National Council of Teachers of Mathematics.
ED  - 
ED  - 
ED  - 
SN  - 2
PY  - 1960///46
CY  - Washington
PB  - 
KW  - 
KW  - 2
KW  - 0
KW  - 6
KW  - 20
KW  - Study and teaching
KW  - Arithmetic
N1  - Includes bibliographies; 5
ER  -