Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{2}{9} . \frac{12}{8}\\=\frac{2}{9} . \frac{3}{2}\\=\frac{2.3}{9.2}\\=\frac{6}{18}\\=\frac{1}{3}\)
2. \(\frac{2}{10} . \frac{10}{11}\\=\frac{1}{5} . \frac{10}{11}\\=\frac{1.10}{5.11}\\=\frac{10}{55}\\=\frac{2}{11}\)
3. \(\frac{4}{7} . \frac{6}{5}\\=\frac{4.6}{7.5}\\=\frac{24}{35}\)
4. \(\frac{11}{9} . \frac{8}{10}\\=\frac{11}{9} . \frac{4}{5}\\=\frac{11.4}{9.5}\\=\frac{44}{45}\)
5. \(\frac{7}{6} . \frac{10}{4}\\=\frac{7}{6} . \frac{5}{2}\\=\frac{7.5}{6.2}\\=\frac{35}{12}\)
6. \(\frac{11}{5} . \frac{6}{7}\\=\frac{11.6}{5.7}\\=\frac{66}{35}\)
7. \(\frac{11}{8} . \frac{7}{8}\\=\frac{11.7}{8.8}\\=\frac{77}{64}\)
8. \(\frac{12}{3} . \frac{11}{10}\\=\frac{4}{1} . \frac{11}{10}\\=\frac{4.11}{1.10}\\=\frac{44}{10}\\=\frac{22}{5}\)
9. \(\frac{12}{8} . \frac{11}{10}\\=\frac{3}{2} . \frac{11}{10}\\=\frac{3.11}{2.10}\\=\frac{33}{20}\)
10. \(\frac{2}{7} . \frac{3}{11}\\=\frac{2.3}{7.11}\\=\frac{6}{77}\)
11. \(\frac{3}{7} . \frac{5}{10}\\=\frac{3}{7} . \frac{1}{2}\\=\frac{3.1}{7.2}\\=\frac{3}{14}\)
12. \(\frac{10}{10} . \frac{4}{8}\\=\frac{1}{1} . \frac{1}{2}\\=\frac{1.1}{1.2}\\=\frac{1}{2}\)