Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{8}{7} . \frac{3}{9}\\=\frac{8}{7} . \frac{1}{3}\\=\frac{8.1}{7.3}\\=\frac{8}{21}\)
2. \(\frac{12}{12} . \frac{5}{6}\\=\frac{1}{1} . \frac{5}{6}\\=\frac{1.5}{1.6}\\=\frac{5}{6}\)
3. \(\frac{11}{12} . \frac{10}{10}\\=\frac{11}{12} . \frac{1}{1}\\=\frac{11.1}{12.1}\\=\frac{11}{12}\)
4. \(\frac{6}{9} . \frac{5}{12}\\=\frac{2}{3} . \frac{5}{12}\\=\frac{2.5}{3.12}\\=\frac{10}{36}\\=\frac{5}{18}\)
5. \(\frac{12}{2} . \frac{5}{10}\\=\frac{6}{1} . \frac{1}{2}\\=\frac{6.1}{1.2}\\=\frac{6}{2}\\=\frac{3}{1}= 3\)
6. \(\frac{2}{5} . \frac{2}{7}\\=\frac{2.2}{5.7}\\=\frac{4}{35}\)
7. \(\frac{6}{3} . \frac{9}{6}\\=\frac{2}{1} . \frac{3}{2}\\=\frac{2.3}{1.2}\\=\frac{6}{2}\\=\frac{3}{1}= 3\)
8. \(\frac{2}{6} . \frac{11}{5}\\=\frac{1}{3} . \frac{11}{5}\\=\frac{1.11}{3.5}\\=\frac{11}{15}\)
9. \(\frac{9}{11} . \frac{4}{7}\\=\frac{9.4}{11.7}\\=\frac{36}{77}\)
10. \(\frac{6}{2} . \frac{11}{8}\\=\frac{3}{1} . \frac{11}{8}\\=\frac{3.11}{1.8}\\=\frac{33}{8}\)
11. \(\frac{8}{3} . \frac{12}{9}\\=\frac{8}{3} . \frac{4}{3}\\=\frac{8.4}{3.3}\\=\frac{32}{9}\)
12. \(\frac{6}{5} . \frac{9}{7}\\=\frac{6.9}{5.7}\\=\frac{54}{35}\)