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Abacus is written by Ruth Merttens and published by Ginn. It's available with International Standard Book Number or ISBN identification 0602290627 (ISBN 10) and 9780602290627 (ISBN 13).
Each unit in the "New Abacus" programme begins with whole-class teaching. All the direct teaching to introduce a concept is on the front of the Teacher Card; the back has: further teaching; references to differentiated practical activities, workbook or textbook pages and photocopy masters.