Kapitel 2: Prozent- und Zinsrechnung (S. 17)

Aufgabe 1

(a) \(\displaystyle\frac{13}{20}=\displaystyle\frac{65}{100}=0,65=65\,\% \)

(b) \(\displaystyle\frac{5}{8}=\displaystyle\frac{625}{1000}=0,625=62,5\,\% \)

(c) \(\displaystyle\frac{17}{10}=1,7=170\,\%\)

(d) \(\displaystyle\frac{15}{12}=\displaystyle\frac{5}{4}=\displaystyle\frac{125}{100}=1,25=125\,\% \)

(e) \(\displaystyle\frac{2}{3}=0,6666\ldots\approx 66,7\,\% \)

Aufgabe 2

(a) \(80\,\%=\displaystyle\frac{80}{100}=\displaystyle\frac{4}{5} \)

(b) \(37,5\,\%=\displaystyle\frac{375}{1000}=\displaystyle\frac{3}{8} \)

(c) \(236\,\%=\displaystyle\frac{236}{100}=\displaystyle\frac{59}{25}\)

(d) \(0,2\,\%=\displaystyle\frac{2}{1000}=\displaystyle\frac{1}{500} \)

Aufgabe 3