Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{5}{8} . \frac{9}{4}\\=\frac{5.9}{8.4}\\=\frac{45}{32}\)
2. \(\frac{7}{9} . \frac{3}{4}\\=\frac{7.3}{9.4}\\=\frac{21}{36}\\=\frac{7}{12}\)
3. \(\frac{12}{10} . \frac{2}{12}\\=\frac{6}{5} . \frac{1}{6}\\=\frac{6.1}{5.6}\\=\frac{6}{30}\\=\frac{1}{5}\)
4. \(\frac{2}{9} . \frac{7}{7}\\=\frac{2}{9} . \frac{1}{1}\\=\frac{2.1}{9.1}\\=\frac{2}{9}\)
5. \(\frac{12}{12} . \frac{3}{6}\\=\frac{1}{1} . \frac{1}{2}\\=\frac{1.1}{1.2}\\=\frac{1}{2}\)
6. \(\frac{8}{7} . \frac{9}{11}\\=\frac{8.9}{7.11}\\=\frac{72}{77}\)
7. \(\frac{7}{2} . \frac{2}{10}\\=\frac{7}{2} . \frac{1}{5}\\=\frac{7.1}{2.5}\\=\frac{7}{10}\)
8. \(\frac{6}{12} . \frac{8}{4}\\=\frac{1}{2} . \frac{2}{1}\\=\frac{1.2}{2.1}\\=\frac{2}{2}\\=\frac{1}{1}= 1\)
9. \(\frac{3}{11} . \frac{2}{4}\\=\frac{3}{11} . \frac{1}{2}\\=\frac{3.1}{11.2}\\=\frac{3}{22}\)
10. \(\frac{8}{7} . \frac{10}{6}\\=\frac{8}{7} . \frac{5}{3}\\=\frac{8.5}{7.3}\\=\frac{40}{21}\)
11. \(\frac{4}{4} . \frac{4}{3}\\=\frac{1}{1} . \frac{4}{3}\\=\frac{1.4}{1.3}\\=\frac{4}{3}\)
12. \(\frac{2}{5} . \frac{12}{7}\\=\frac{2.12}{5.7}\\=\frac{24}{35}\)