Subtraction drill for levels 1-3

Détails bibliographiques
Auteur principal:	Mock, Valerie E.
Format:	Livre
Langue:	English
Publié:	Belmont, Calif. David S. Lake Publishers c1982.
Collection:	A learning workbooks : Mathematics [v.3]
Sujets:	Subtraction > Study and teaching (Primary) Subtraction > Problems, exercises, etc.