TY  - BOOK
AU  - Fuson, Karen C.
AU  - Kwon, Youngshim
TI  - Korean children's single digit addition and subtraction : numbers structured by ten
KW  - ADICION
KW  - DESTREZAS MATEMATICAS
KW  - RESOLUCION DE PROBLEMAS
KW  - RESTA
KW  - SISTEMA NUMERICO
ER  -