Breuken verm. (reeks 1)

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Vermenigvuldig de breuken

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

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Vermenigvuldig de breuken

Verbetersleutel

1. \(\frac{12}{12} . \frac{8}{2}\\=\frac{1}{1} . \frac{4}{1}\\=\frac{1.4}{1.1}\\=\frac{4}{1}= 4\)
2. \(\frac{7}{4} . \frac{6}{4}\\=\frac{7}{4} . \frac{3}{2}\\=\frac{7.3}{4.2}\\=\frac{21}{8}\)
3. \(\frac{4}{11} . \frac{6}{11}\\=\frac{4.6}{11.11}\\=\frac{24}{121}\)
4. \(\frac{10}{4} . \frac{12}{9}\\=\frac{5}{2} . \frac{4}{3}\\=\frac{5.4}{2.3}\\=\frac{20}{6}\\=\frac{10}{3}\)
5. \(\frac{4}{8} . \frac{3}{3}\\=\frac{1}{2} . \frac{1}{1}\\=\frac{1.1}{2.1}\\=\frac{1}{2}\)
6. \(\frac{9}{3} . \frac{11}{7}\\=\frac{3}{1} . \frac{11}{7}\\=\frac{3.11}{1.7}\\=\frac{33}{7}\)
7. \(\frac{4}{5} . \frac{7}{11}\\=\frac{4.7}{5.11}\\=\frac{28}{55}\)
8. \(\frac{8}{3} . \frac{12}{4}\\=\frac{8}{3} . \frac{3}{1}\\=\frac{8.3}{3.1}\\=\frac{24}{3}\\=\frac{8}{1}= 8\)
9. \(\frac{6}{7} . \frac{4}{7}\\=\frac{6.4}{7.7}\\=\frac{24}{49}\)
10. \(\frac{10}{4} . \frac{12}{4}\\=\frac{5}{2} . \frac{3}{1}\\=\frac{5.3}{2.1}\\=\frac{15}{2}\)
11. \(\frac{7}{10} . \frac{10}{8}\\=\frac{7}{10} . \frac{5}{4}\\=\frac{7.5}{10.4}\\=\frac{35}{40}\\=\frac{7}{8}\)
12. \(\frac{11}{12} . \frac{4}{2}\\=\frac{11}{12} . \frac{2}{1}\\=\frac{11.2}{12.1}\\=\frac{22}{12}\\=\frac{11}{6}\)