Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{12}{3} . \frac{10}{2}\\=\frac{4}{1} . \frac{5}{1}\\=\frac{4.5}{1.1}\\=\frac{20}{1}= 20\)
2. \(\frac{4}{12} . \frac{8}{5}\\=\frac{1}{3} . \frac{8}{5}\\=\frac{1.8}{3.5}\\=\frac{8}{15}\)
3. \(\frac{6}{4} . \frac{8}{5}\\=\frac{3}{2} . \frac{8}{5}\\=\frac{3.8}{2.5}\\=\frac{24}{10}\\=\frac{12}{5}\)
4. \(\frac{10}{2} . \frac{12}{8}\\=\frac{5}{1} . \frac{3}{2}\\=\frac{5.3}{1.2}\\=\frac{15}{2}\)
5. \(\frac{6}{5} . \frac{5}{9}\\=\frac{6.5}{5.9}\\=\frac{30}{45}\\=\frac{2}{3}\)
6. \(\frac{7}{12} . \frac{5}{5}\\=\frac{7}{12} . \frac{1}{1}\\=\frac{7.1}{12.1}\\=\frac{7}{12}\)
7. \(\frac{10}{9} . \frac{2}{11}\\=\frac{10.2}{9.11}\\=\frac{20}{99}\)
8. \(\frac{7}{2} . \frac{11}{11}\\=\frac{7}{2} . \frac{1}{1}\\=\frac{7.1}{2.1}\\=\frac{7}{2}\)
9. \(\frac{12}{6} . \frac{5}{9}\\=\frac{2}{1} . \frac{5}{9}\\=\frac{2.5}{1.9}\\=\frac{10}{9}\)
10. \(\frac{7}{2} . \frac{7}{10}\\=\frac{7.7}{2.10}\\=\frac{49}{20}\)
11. \(\frac{4}{12} . \frac{7}{11}\\=\frac{1}{3} . \frac{7}{11}\\=\frac{1.7}{3.11}\\=\frac{7}{33}\)
12. \(\frac{10}{7} . \frac{8}{6}\\=\frac{10}{7} . \frac{4}{3}\\=\frac{10.4}{7.3}\\=\frac{40}{21}\)