TY  - BOOK
ED  - National Council of teachers of Mathematics
TI  - Numeros racionales 6 
SN  - 9682400988
AV  - QA248.3 N271n n° 6 
CY  - Mexico 
PB  -  Trillas
KW  - 1. Aritmetica - Fundamentos
N1  - Traduccion de : Topics in mathematics for elementary school Teachers
ER  -