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How to calculate correctly without using a computer. Fundamental operations of arithmetic, fractional arithmetic, the rule of three, percentages, geometry. Richtig rechnen - ohne Computer. Grundrechnungsarten, Bruchrechnen, Dreisatz, Prozentrechnen, Geometrie. (German)
Duesseldorf: ECON Taschenbuch Verl. Apr 1987. 195 p. Ser. Title: ETB. ECON Ratgeber. no. 20281. [ISBN 3-612-20281-2]
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