Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{10}{11} . \frac{10}{10}\\=\frac{10}{11} . \frac{1}{1}\\=\frac{10.1}{11.1}\\=\frac{10}{11}\)
2. \(\frac{9}{7} . \frac{7}{9}\\=\frac{9.7}{7.9}\\=\frac{63}{63}\\=\frac{1}{1}= 1\)
3. \(\frac{11}{9} . \frac{3}{12}\\=\frac{11}{9} . \frac{1}{4}\\=\frac{11.1}{9.4}\\=\frac{11}{36}\)
4. \(\frac{4}{3} . \frac{4}{9}\\=\frac{4.4}{3.9}\\=\frac{16}{27}\)
5. \(\frac{4}{7} . \frac{5}{8}\\=\frac{4.5}{7.8}\\=\frac{20}{56}\\=\frac{5}{14}\)
6. \(\frac{3}{6} . \frac{2}{2}\\=\frac{1}{2} . \frac{1}{1}\\=\frac{1.1}{2.1}\\=\frac{1}{2}\)
7. \(\frac{11}{10} . \frac{6}{6}\\=\frac{11}{10} . \frac{1}{1}\\=\frac{11.1}{10.1}\\=\frac{11}{10}\)
8. \(\frac{9}{8} . \frac{3}{10}\\=\frac{9.3}{8.10}\\=\frac{27}{80}\)
9. \(\frac{3}{4} . \frac{11}{3}\\=\frac{3.11}{4.3}\\=\frac{33}{12}\\=\frac{11}{4}\)
10. \(\frac{8}{9} . \frac{7}{8}\\=\frac{8.7}{9.8}\\=\frac{56}{72}\\=\frac{7}{9}\)
11. \(\frac{11}{12} . \frac{8}{11}\\=\frac{11.8}{12.11}\\=\frac{88}{132}\\=\frac{2}{3}\)
12. \(\frac{8}{6} . \frac{2}{3}\\=\frac{4}{3} . \frac{2}{3}\\=\frac{4.2}{3.3}\\=\frac{8}{9}\)