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Training fractions, percentage, and calculation of interest grades 6/7. Training Bruchrechnung, Prozentrechnung und Zinsrechnung. 6./7. Schuljahr. (German)
Stuttgart: Klett. 1988. 102 p. With booklet of solutions, 60 p. Ser. Title: Klett Training. [ISBN 3-12-922019-4]
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