Mental Arithmetic Book 6 Answers: Ages 7-11+
by Schofield & Sims,T R Goddard,J W Adams,R P Beaumont
ISBN 13: 9780721708102
Format: Paperback (47 pages) Publisher: Schofield & Sims Ltd Published: 04 Jan 2016
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Number Words and Number Symbols: Cultural History of Numbers
by Karl Menninger
ISBN 13: 9780486270968
Format: Illustrated (512 pages) Publisher: Dover Publications Inc. Published: 05 Oct 1992