Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{5}{7} . \frac{10}{7}\\=\frac{5.10}{7.7}\\=\frac{50}{49}\)
2. \(\frac{7}{4} . \frac{9}{7}\\=\frac{7.9}{4.7}\\=\frac{63}{28}\\=\frac{9}{4}\)
3. \(\frac{2}{5} . \frac{8}{6}\\=\frac{2}{5} . \frac{4}{3}\\=\frac{2.4}{5.3}\\=\frac{8}{15}\)
4. \(\frac{5}{11} . \frac{8}{7}\\=\frac{5.8}{11.7}\\=\frac{40}{77}\)
5. \(\frac{4}{5} . \frac{12}{10}\\=\frac{4}{5} . \frac{6}{5}\\=\frac{4.6}{5.5}\\=\frac{24}{25}\)
6. \(\frac{11}{5} . \frac{2}{12}\\=\frac{11}{5} . \frac{1}{6}\\=\frac{11.1}{5.6}\\=\frac{11}{30}\)
7. \(\frac{6}{11} . \frac{7}{6}\\=\frac{6.7}{11.6}\\=\frac{42}{66}\\=\frac{7}{11}\)
8. \(\frac{11}{9} . \frac{3}{12}\\=\frac{11}{9} . \frac{1}{4}\\=\frac{11.1}{9.4}\\=\frac{11}{36}\)
9. \(\frac{6}{7} . \frac{8}{11}\\=\frac{6.8}{7.11}\\=\frac{48}{77}\)
10. \(\frac{4}{3} . \frac{3}{9}\\=\frac{4}{3} . \frac{1}{3}\\=\frac{4.1}{3.3}\\=\frac{4}{9}\)
11. \(\frac{12}{4} . \frac{8}{11}\\=\frac{3}{1} . \frac{8}{11}\\=\frac{3.8}{1.11}\\=\frac{24}{11}\)
12. \(\frac{12}{11} . \frac{2}{5}\\=\frac{12.2}{11.5}\\=\frac{24}{55}\)