Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

1. \(\frac{10}{2} . \frac{5}{8}\)
2. \(\frac{10}{9} . \frac{8}{3}\)
3. \(\frac{10}{8} . \frac{2}{5}\)
4. \(\frac{2}{5} . \frac{12}{10}\)
5. \(\frac{7}{2} . \frac{12}{12}\)
6. \(\frac{4}{5} . \frac{7}{2}\)
7. \(\frac{8}{12} . \frac{9}{9}\)
8. \(\frac{8}{8} . \frac{2}{8}\)
9. \(\frac{11}{4} . \frac{2}{3}\)
10. \(\frac{7}{3} . \frac{10}{6}\)
11. \(\frac{7}{12} . \frac{6}{4}\)
12. \(\frac{9}{6} . \frac{7}{2}\)

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{10}{2} . \frac{5}{8}\\=\frac{5}{1} . \frac{5}{8}\\=\frac{5.5}{1.8}\\=\frac{25}{8}\)
2. \(\frac{10}{9} . \frac{8}{3}\\=\frac{10.8}{9.3}\\=\frac{80}{27}\)
3. \(\frac{10}{8} . \frac{2}{5}\\=\frac{5}{4} . \frac{2}{5}\\=\frac{5.2}{4.5}\\=\frac{10}{20}\\=\frac{1}{2}\)
4. \(\frac{2}{5} . \frac{12}{10}\\=\frac{2}{5} . \frac{6}{5}\\=\frac{2.6}{5.5}\\=\frac{12}{25}\)
5. \(\frac{7}{2} . \frac{12}{12}\\=\frac{7}{2} . \frac{1}{1}\\=\frac{7.1}{2.1}\\=\frac{7}{2}\)
6. \(\frac{4}{5} . \frac{7}{2}\\=\frac{4.7}{5.2}\\=\frac{28}{10}\\=\frac{14}{5}\)
7. \(\frac{8}{12} . \frac{9}{9}\\=\frac{2}{3} . \frac{1}{1}\\=\frac{2.1}{3.1}\\=\frac{2}{3}\)
8. \(\frac{8}{8} . \frac{2}{8}\\=\frac{1}{1} . \frac{1}{4}\\=\frac{1.1}{1.4}\\=\frac{1}{4}\)
9. \(\frac{11}{4} . \frac{2}{3}\\=\frac{11.2}{4.3}\\=\frac{22}{12}\\=\frac{11}{6}\)
10. \(\frac{7}{3} . \frac{10}{6}\\=\frac{7}{3} . \frac{5}{3}\\=\frac{7.5}{3.3}\\=\frac{35}{9}\)
11. \(\frac{7}{12} . \frac{6}{4}\\=\frac{7}{12} . \frac{3}{2}\\=\frac{7.3}{12.2}\\=\frac{21}{24}\\=\frac{7}{8}\)
12. \(\frac{9}{6} . \frac{7}{2}\\=\frac{3}{2} . \frac{7}{2}\\=\frac{3.7}{2.2}\\=\frac{21}{4}\)