Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{7}{5} . \frac{6}{4}\\=\frac{7}{5} . \frac{3}{2}\\=\frac{7.3}{5.2}\\=\frac{21}{10}\)
2. \(\frac{6}{7} . \frac{5}{9}\\=\frac{6.5}{7.9}\\=\frac{30}{63}\\=\frac{10}{21}\)
3. \(\frac{4}{9} . \frac{10}{11}\\=\frac{4.10}{9.11}\\=\frac{40}{99}\)
4. \(\frac{2}{6} . \frac{6}{10}\\=\frac{1}{3} . \frac{3}{5}\\=\frac{1.3}{3.5}\\=\frac{3}{15}\\=\frac{1}{5}\)
5. \(\frac{2}{7} . \frac{7}{9}\\=\frac{2.7}{7.9}\\=\frac{14}{63}\\=\frac{2}{9}\)
6. \(\frac{5}{8} . \frac{8}{9}\\=\frac{5.8}{8.9}\\=\frac{40}{72}\\=\frac{5}{9}\)
7. \(\frac{10}{2} . \frac{12}{7}\\=\frac{5}{1} . \frac{12}{7}\\=\frac{5.12}{1.7}\\=\frac{60}{7}\)
8. \(\frac{9}{6} . \frac{11}{12}\\=\frac{3}{2} . \frac{11}{12}\\=\frac{3.11}{2.12}\\=\frac{33}{24}\\=\frac{11}{8}\)
9. \(\frac{11}{11} . \frac{11}{3}\\=\frac{1}{1} . \frac{11}{3}\\=\frac{1.11}{1.3}\\=\frac{11}{3}\)
10. \(\frac{8}{6} . \frac{6}{4}\\=\frac{4}{3} . \frac{3}{2}\\=\frac{4.3}{3.2}\\=\frac{12}{6}\\=\frac{2}{1}= 2\)
11. \(\frac{9}{9} . \frac{8}{6}\\=\frac{1}{1} . \frac{4}{3}\\=\frac{1.4}{1.3}\\=\frac{4}{3}\)
12. \(\frac{5}{10} . \frac{3}{5}\\=\frac{1}{2} . \frac{3}{5}\\=\frac{1.3}{2.5}\\=\frac{3}{10}\)