Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{10}{8} . \frac{3}{12}\\=\frac{5}{4} . \frac{1}{4}\\=\frac{5.1}{4.4}\\=\frac{5}{16}\)
2. \(\frac{11}{9} . \frac{4}{5}\\=\frac{11.4}{9.5}\\=\frac{44}{45}\)
3. \(\frac{9}{6} . \frac{5}{7}\\=\frac{3}{2} . \frac{5}{7}\\=\frac{3.5}{2.7}\\=\frac{15}{14}\)
4. \(\frac{8}{12} . \frac{3}{8}\\=\frac{2}{3} . \frac{3}{8}\\=\frac{2.3}{3.8}\\=\frac{6}{24}\\=\frac{1}{4}\)
5. \(\frac{3}{5} . \frac{7}{11}\\=\frac{3.7}{5.11}\\=\frac{21}{55}\)
6. \(\frac{5}{8} . \frac{10}{9}\\=\frac{5.10}{8.9}\\=\frac{50}{72}\\=\frac{25}{36}\)
7. \(\frac{9}{3} . \frac{8}{10}\\=\frac{3}{1} . \frac{4}{5}\\=\frac{3.4}{1.5}\\=\frac{12}{5}\)
8. \(\frac{2}{10} . \frac{11}{6}\\=\frac{1}{5} . \frac{11}{6}\\=\frac{1.11}{5.6}\\=\frac{11}{30}\)
9. \(\frac{8}{2} . \frac{4}{4}\\=\frac{4}{1} . \frac{1}{1}\\=\frac{4.1}{1.1}\\=\frac{4}{1}= 4\)
10. \(\frac{4}{11} . \frac{12}{5}\\=\frac{4.12}{11.5}\\=\frac{48}{55}\)
11. \(\frac{7}{10} . \frac{8}{10}\\=\frac{7}{10} . \frac{4}{5}\\=\frac{7.4}{10.5}\\=\frac{28}{50}\\=\frac{14}{25}\)
12. \(\frac{12}{11} . \frac{4}{4}\\=\frac{12}{11} . \frac{1}{1}\\=\frac{12.1}{11.1}\\=\frac{12}{11}\)