Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{3}{12} . \frac{9}{11}\\=\frac{1}{4} . \frac{9}{11}\\=\frac{1.9}{4.11}\\=\frac{9}{44}\)
2. \(\frac{6}{7} . \frac{12}{10}\\=\frac{6}{7} . \frac{6}{5}\\=\frac{6.6}{7.5}\\=\frac{36}{35}\)
3. \(\frac{7}{7} . \frac{8}{6}\\=\frac{1}{1} . \frac{4}{3}\\=\frac{1.4}{1.3}\\=\frac{4}{3}\)
4. \(\frac{4}{10} . \frac{5}{10}\\=\frac{2}{5} . \frac{1}{2}\\=\frac{2.1}{5.2}\\=\frac{2}{10}\\=\frac{1}{5}\)
5. \(\frac{8}{4} . \frac{10}{9}\\=\frac{2}{1} . \frac{10}{9}\\=\frac{2.10}{1.9}\\=\frac{20}{9}\)
6. \(\frac{3}{9} . \frac{10}{7}\\=\frac{1}{3} . \frac{10}{7}\\=\frac{1.10}{3.7}\\=\frac{10}{21}\)
7. \(\frac{5}{11} . \frac{12}{11}\\=\frac{5.12}{11.11}\\=\frac{60}{121}\)
8. \(\frac{5}{11} . \frac{6}{10}\\=\frac{5}{11} . \frac{3}{5}\\=\frac{5.3}{11.5}\\=\frac{15}{55}\\=\frac{3}{11}\)
9. \(\frac{9}{7} . \frac{6}{9}\\=\frac{9}{7} . \frac{2}{3}\\=\frac{9.2}{7.3}\\=\frac{18}{21}\\=\frac{6}{7}\)
10. \(\frac{5}{6} . \frac{9}{4}\\=\frac{5.9}{6.4}\\=\frac{45}{24}\\=\frac{15}{8}\)
11. \(\frac{2}{7} . \frac{3}{5}\\=\frac{2.3}{7.5}\\=\frac{6}{35}\)
12. \(\frac{6}{9} . \frac{3}{3}\\=\frac{2}{3} . \frac{1}{1}\\=\frac{2.1}{3.1}\\=\frac{2}{3}\)