Understanding arithmetic

Detalles Bibliográficos
Autor principal:	Swain, Robert Lomond
Otros Autores:	Nichols, Eugene Douglas, 1923- ed
Formato:	Libro
Lenguaje:	English
Publicado:	New York Rinehart and Winston c1965.
Materias:	Number concept. Arithmetic > Foundations. Arithmetic > Study and teaching.