Subtraction drill for levels 1-3

Manylion Llyfryddiaeth
Prif Awdur:	Mock, Valerie E.
Fformat:	Llyfr
Iaith:	English
Cyhoeddwyd:	Belmont, Calif. David S. Lake Publishers c1982.
Cyfres:	A learning workbooks : Mathematics [v.3]
Pynciau:	Subtraction > Study and teaching (Primary) Subtraction > Problems, exercises, etc.