Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{12}{9} . \frac{9}{3}\\=\frac{4}{3} . \frac{3}{1}\\=\frac{4.3}{3.1}\\=\frac{12}{3}\\=\frac{4}{1}= 4\)
2. \(\frac{4}{2} . \frac{10}{2}\\=\frac{2}{1} . \frac{5}{1}\\=\frac{2.5}{1.1}\\=\frac{10}{1}= 10\)
3. \(\frac{12}{11} . \frac{7}{8}\\=\frac{12.7}{11.8}\\=\frac{84}{88}\\=\frac{21}{22}\)
4. \(\frac{9}{5} . \frac{10}{3}\\=\frac{9.10}{5.3}\\=\frac{90}{15}\\=\frac{6}{1}= 6\)
5. \(\frac{7}{8} . \frac{9}{3}\\=\frac{7}{8} . \frac{3}{1}\\=\frac{7.3}{8.1}\\=\frac{21}{8}\)
6. \(\frac{4}{6} . \frac{9}{11}\\=\frac{2}{3} . \frac{9}{11}\\=\frac{2.9}{3.11}\\=\frac{18}{33}\\=\frac{6}{11}\)
7. \(\frac{6}{5} . \frac{11}{9}\\=\frac{6.11}{5.9}\\=\frac{66}{45}\\=\frac{22}{15}\)
8. \(\frac{3}{2} . \frac{3}{2}\\=\frac{3.3}{2.2}\\=\frac{9}{4}\)
9. \(\frac{3}{9} . \frac{11}{4}\\=\frac{1}{3} . \frac{11}{4}\\=\frac{1.11}{3.4}\\=\frac{11}{12}\)
10. \(\frac{10}{8} . \frac{4}{7}\\=\frac{5}{4} . \frac{4}{7}\\=\frac{5.4}{4.7}\\=\frac{20}{28}\\=\frac{5}{7}\)
11. \(\frac{9}{6} . \frac{11}{2}\\=\frac{3}{2} . \frac{11}{2}\\=\frac{3.11}{2.2}\\=\frac{33}{4}\)
12. \(\frac{12}{4} . \frac{6}{7}\\=\frac{3}{1} . \frac{6}{7}\\=\frac{3.6}{1.7}\\=\frac{18}{7}\)