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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]
Classification: U28
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Speak, calculate and write correctly. The standard book for school, work, and further education. Rede, Schreibe, Rechne richtig. Das Standardwerk fuer Schule, Beruf und Weiterbildung. (German)
Muenchen, Germany, F.R.: Suedwest Verl. 1979. 784 p. ISBN: 3 517 00706 4
Classification: A18
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