Breuken aftrekken (reeks 1)

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Trek de breuken af

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

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Trek de breuken af

Verbetersleutel

1. \(\frac{7}{10}-\frac{2}{3}\\=\frac{21}{30}-\frac{20}{30}\\=\frac{21-20}{30}\\=\frac{1}{30}\)
2. \(\frac{10}{9}-\frac{9}{11}\\=\frac{110}{99}-\frac{81}{99}\\=\frac{110-81}{99}\\=\frac{29}{99}\)
3. \(\frac{5}{2}-\frac{10}{11}\\=\frac{55}{22}-\frac{20}{22}\\=\frac{55-20}{22}\\=\frac{35}{22}\)
4. \(\frac{10}{7}-\frac{4}{11}\\=\frac{110}{77}-\frac{28}{77}\\=\frac{110-28}{77}\\=\frac{82}{77}\)
5. \(\frac{10}{11}-\frac{4}{5}\\=\frac{50}{55}-\frac{44}{55}\\=\frac{50-44}{55}\\=\frac{6}{55}\)
6. \(\frac{10}{3}-\frac{8}{11}\\=\frac{110}{33}-\frac{24}{33}\\=\frac{110-24}{33}\\=\frac{86}{33}\)
7. \(\frac{10}{3}-\frac{2}{7}\\=\frac{70}{21}-\frac{6}{21}\\=\frac{70-6}{21}\\=\frac{64}{21}\)
8. \(\frac{6}{11}-\frac{2}{11}\\=\frac{6-2}{11}\\=\frac{4}{11}\)
9. \(\frac{5}{6}-\frac{2}{9}\\=\frac{15}{18}-\frac{4}{18}\\=\frac{15-4}{18}\\=\frac{11}{18}\)
10. \(\frac{7}{4}-\frac{3}{10}\\=\frac{35}{20}-\frac{6}{20}\\=\frac{35-6}{20}\\=\frac{29}{20}\)
11. \(\frac{5}{4}-\frac{6}{7}\\=\frac{35}{28}-\frac{24}{28}\\=\frac{35-24}{28}\\=\frac{11}{28}\)
12. \(\frac{4}{5}-\frac{2}{9}\\=\frac{36}{45}-\frac{10}{45}\\=\frac{36-10}{45}\\=\frac{26}{45}\)