Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{11}{9} . \frac{2}{12}\\=\frac{11}{9} . \frac{1}{6}\\=\frac{11.1}{9.6}\\=\frac{11}{54}\)
2. \(\frac{12}{12} . \frac{12}{7}\\=\frac{1}{1} . \frac{12}{7}\\=\frac{1.12}{1.7}\\=\frac{12}{7}\)
3. \(\frac{3}{12} . \frac{12}{7}\\=\frac{1}{4} . \frac{12}{7}\\=\frac{1.12}{4.7}\\=\frac{12}{28}\\=\frac{3}{7}\)
4. \(\frac{12}{9} . \frac{12}{6}\\=\frac{4}{3} . \frac{2}{1}\\=\frac{4.2}{3.1}\\=\frac{8}{3}\)
5. \(\frac{7}{5} . \frac{8}{12}\\=\frac{7}{5} . \frac{2}{3}\\=\frac{7.2}{5.3}\\=\frac{14}{15}\)
6. \(\frac{11}{7} . \frac{3}{12}\\=\frac{11}{7} . \frac{1}{4}\\=\frac{11.1}{7.4}\\=\frac{11}{28}\)
7. \(\frac{7}{8} . \frac{9}{10}\\=\frac{7.9}{8.10}\\=\frac{63}{80}\)
8. \(\frac{6}{2} . \frac{12}{2}\\=\frac{3}{1} . \frac{6}{1}\\=\frac{3.6}{1.1}\\=\frac{18}{1}= 18\)
9. \(\frac{9}{5} . \frac{10}{7}\\=\frac{9.10}{5.7}\\=\frac{90}{35}\\=\frac{18}{7}\)
10. \(\frac{3}{5} . \frac{12}{11}\\=\frac{3.12}{5.11}\\=\frac{36}{55}\)
11. \(\frac{9}{12} . \frac{3}{3}\\=\frac{3}{4} . \frac{1}{1}\\=\frac{3.1}{4.1}\\=\frac{3}{4}\)
12. \(\frac{5}{8} . \frac{9}{9}\\=\frac{5}{8} . \frac{1}{1}\\=\frac{5.1}{8.1}\\=\frac{5}{8}\)