![New mental arithmetic, by John Duncan. [1st ed.], 7th and revised impression; revised by Helen Cline. Answers](/img/books.png)
Originally published (B54-15072) as 'Mental arithmetic', 1954.
New mental arithmetic, by John Duncan. [1st ed.], 7th and revised impression; revised by Helen Cline. Answers by John Duncan. ISBN 0003187314. Published by Collins in 1970. Publication and catalogue information, links to buy online and reader comments.