Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{9}{12} . \frac{3}{7}\\=\frac{3}{4} . \frac{3}{7}\\=\frac{3.3}{4.7}\\=\frac{9}{28}\)
2. \(\frac{7}{2} . \frac{5}{8}\\=\frac{7.5}{2.8}\\=\frac{35}{16}\)
3. \(\frac{4}{9} . \frac{9}{4}\\=\frac{4.9}{9.4}\\=\frac{36}{36}\\=\frac{1}{1}= 1\)
4. \(\frac{2}{12} . \frac{5}{8}\\=\frac{1}{6} . \frac{5}{8}\\=\frac{1.5}{6.8}\\=\frac{5}{48}\)
5. \(\frac{10}{6} . \frac{3}{8}\\=\frac{5}{3} . \frac{3}{8}\\=\frac{5.3}{3.8}\\=\frac{15}{24}\\=\frac{5}{8}\)
6. \(\frac{6}{6} . \frac{9}{5}\\=\frac{1}{1} . \frac{9}{5}\\=\frac{1.9}{1.5}\\=\frac{9}{5}\)
7. \(\frac{8}{4} . \frac{10}{6}\\=\frac{2}{1} . \frac{5}{3}\\=\frac{2.5}{1.3}\\=\frac{10}{3}\)
8. \(\frac{12}{6} . \frac{9}{7}\\=\frac{2}{1} . \frac{9}{7}\\=\frac{2.9}{1.7}\\=\frac{18}{7}\)
9. \(\frac{3}{12} . \frac{3}{3}\\=\frac{1}{4} . \frac{1}{1}\\=\frac{1.1}{4.1}\\=\frac{1}{4}\)
10. \(\frac{7}{10} . \frac{9}{2}\\=\frac{7.9}{10.2}\\=\frac{63}{20}\)
11. \(\frac{6}{12} . \frac{3}{9}\\=\frac{1}{2} . \frac{1}{3}\\=\frac{1.1}{2.3}\\=\frac{1}{6}\)
12. \(\frac{5}{9} . \frac{7}{12}\\=\frac{5.7}{9.12}\\=\frac{35}{108}\)