The teaching of trade calculations
Subtitle: notes for part-time teachers.
Contributors: New Zealand. Technical Correspondence Institute.
Edition: [2d ed.]
Published: 1970
Place of publication: Wellington
Language: eng
Number of pages: 79
Subjects: Arithmetic -- Study and teaching.
Notes: References included in Preface ... : p. [iii]
Cover title.
"Revised by Technical Correspondence Institute."