# Mathematikunterricht/ Sek/ Brüche/ Ü/ Add4 NennerNeu 80max A4 1

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Übungsbeispiele zur Addition von jeweils 4 Brüchen.

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 14 und 4.

a) ${\displaystyle {\frac {1}{14}}+{\frac {5}{7}}+{\frac {1}{6}}+{\frac {8}{21}}=}$
b) ${\displaystyle {\frac {1}{18}}+{\frac {7}{12}}+{\frac {3}{4}}+{\frac {1}{6}}=}$

2. Berechne und kürze mit 18...

a) ${\displaystyle {\frac {1}{4}}+{\frac {5}{6}}+{\frac {7}{18}}+{\frac {1}{12}}=}$
b) ${\displaystyle {\frac {3}{16}}+{\frac {1}{8}}+{\frac {1}{10}}+{\frac {3}{20}}=}$
c) ${\displaystyle {\frac {5}{18}}+{\frac {1}{4}}+{\frac {5}{9}}+{\frac {5}{12}}=}$

3. Berechne und kürze mit 5, 18...

a) ${\displaystyle {\frac {1}{40}}+{\frac {1}{20}}+{\frac {3}{10}}+{\frac {1}{16}}=}$
b) ${\displaystyle {\frac {13}{10}}+{\frac {1}{5}}+{\frac {1}{4}}+{\frac {1}{2}}=}$

4. Berechne und kürze mit 9...

a) ${\displaystyle {\frac {1}{36}}+{\frac {1}{12}}+{\frac {1}{18}}+{\frac {5}{24}}=}$
b) ${\displaystyle {\frac {1}{24}}+{\frac {1}{8}}+{\frac {9}{16}}+{\frac {1}{12}}=}$
c) ${\displaystyle {\frac {3}{4}}+{\frac {1}{12}}+{\frac {1}{8}}+{\frac {1}{3}}=}$

Lösungen

${\displaystyle {\frac {14}{9}}}$${\displaystyle {\frac {4}{3}}}$${\displaystyle {\frac {14}{9}}}$${\displaystyle {\frac {7}{16}}}$${\displaystyle {\frac {3}{2}}}$${\displaystyle {\frac {9}{16}}}$${\displaystyle {\frac {9}{4}}}$${\displaystyle {\frac {31}{24}}}$${\displaystyle {\frac {3}{8}}}$${\displaystyle {\frac {13}{16}}}$${\displaystyle {\frac {4}{5}}}$${\displaystyle {\frac {3}{2}}}$${\displaystyle {\frac {1}{3}}}$${\displaystyle {\frac {6}{5}}}$${\displaystyle {\frac {3}{7}}}$${\displaystyle {\frac {5}{6}}}$${\displaystyle {\frac {16}{27}}}$${\displaystyle {\frac {11}{9}}}$${\displaystyle {\frac {29}{4}}}$${\displaystyle {\frac {19}{16}}}$

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 3 und 14.

a) ${\displaystyle {\frac {2}{15}}+{\frac {1}{30}}+{\frac {1}{10}}+{\frac {1}{12}}=}$
b) ${\displaystyle {\frac {1}{10}}+{\frac {3}{14}}+{\frac {3}{7}}+{\frac {2}{35}}=}$

2. Berechne und kürze mit 72...

a) ${\displaystyle {\frac {1}{10}}+{\frac {1}{4}}+{\frac {1}{8}}+{\frac {2}{5}}=}$
b) ${\displaystyle {\frac {7}{18}}+{\frac {3}{8}}+{\frac {1}{36}}+{\frac {5}{24}}=}$
c) ${\displaystyle {\frac {1}{2}}+{\frac {3}{4}}+{\frac {4}{3}}+{\frac {1}{6}}=}$

3. Berechne und kürze mit 3, 3...

a) ${\displaystyle {\frac {5}{12}}+{\frac {3}{8}}+{\frac {5}{4}}+{\frac {1}{3}}=}$
b) ${\displaystyle {\frac {7}{20}}+{\frac {1}{16}}+{\frac {1}{10}}+{\frac {7}{40}}=}$

4. Berechne und kürze mit 6...

a) ${\displaystyle {\frac {1}{22}}+{\frac {1}{11}}+{\frac {1}{6}}+{\frac {2}{33}}=}$
b) ${\displaystyle {\frac {1}{16}}+{\frac {7}{24}}+{\frac {1}{6}}+{\frac {1}{8}}=}$
c) ${\displaystyle {\frac {5}{21}}+{\frac {9}{14}}+{\frac {2}{7}}+{\frac {1}{6}}=}$

Lösungen

${\displaystyle {\frac {4}{5}}}$${\displaystyle {\frac {7}{20}}}$${\displaystyle {\frac {7}{8}}}$${\displaystyle {\frac {11}{16}}}$${\displaystyle {\frac {11}{4}}}$${\displaystyle {\frac {19}{8}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {31}{48}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {4}{3}}}$${\displaystyle {\frac {11}{16}}}$${\displaystyle {\frac {4}{11}}}$${\displaystyle {\frac {29}{48}}}$${\displaystyle {\frac {9}{7}}}$${\displaystyle {\frac {43}{24}}}$${\displaystyle {\frac {71}{80}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {7}{16}}}$${\displaystyle {\frac {13}{12}}}$${\displaystyle {\frac {8}{3}}}$

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 22 und 12.

a) ${\displaystyle {\frac {1}{33}}+{\frac {1}{6}}+{\frac {1}{11}}+{\frac {1}{22}}=}$
b) ${\displaystyle {\frac {1}{12}}+{\frac {1}{6}}+{\frac {1}{10}}+{\frac {1}{20}}=}$

2. Berechne und kürze mit 42...

a) ${\displaystyle {\frac {1}{20}}+{\frac {1}{16}}+{\frac {11}{40}}+{\frac {3}{10}}=}$
b) ${\displaystyle {\frac {1}{14}}+{\frac {1}{8}}+{\frac {1}{7}}+{\frac {1}{28}}=}$
c) ${\displaystyle {\frac {1}{6}}+{\frac {1}{14}}+{\frac {10}{21}}+{\frac {2}{7}}=}$

3. Berechne und kürze mit 5, 42...

a) ${\displaystyle {\frac {1}{8}}+{\frac {7}{20}}+{\frac {1}{5}}+{\frac {7}{10}}=}$
b) ${\displaystyle {\frac {9}{10}}+{\frac {1}{6}}+{\frac {4}{15}}+{\frac {1}{3}}=}$

4. Berechne und kürze mit 10...

a) ${\displaystyle {\frac {4}{9}}+{\frac {1}{6}}+{\frac {1}{18}}+{\frac {1}{12}}=}$
b) ${\displaystyle {\frac {1}{6}}+{\frac {2}{33}}+{\frac {7}{22}}+{\frac {2}{11}}=}$
c) ${\displaystyle {\frac {1}{3}}+{\frac {1}{2}}+{\frac {1}{9}}+{\frac {1}{6}}=}$

Lösungen

${\displaystyle {\frac {3}{8}}}$${\displaystyle {\frac {2}{5}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {5}{3}}}$${\displaystyle {\frac {3}{4}}}$${\displaystyle {\frac {1}{3}}}$${\displaystyle {\frac {11}{16}}}$${\displaystyle {\frac {11}{8}}}$${\displaystyle {\frac {10}{7}}}$${\displaystyle {\frac {8}{11}}}$${\displaystyle {\frac {10}{9}}}$${\displaystyle {\frac {1}{2}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {2}{5}}}$${\displaystyle {\frac {2}{1}}}$${\displaystyle {\frac {15}{8}}}$${\displaystyle {\frac {29}{40}}}$${\displaystyle {\frac {17}{8}}}$${\displaystyle {\frac {19}{8}}}$

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 2 und 9.

a) ${\displaystyle {\frac {1}{6}}+{\frac {1}{9}}+{\frac {1}{3}}+{\frac {1}{2}}=}$
b) ${\displaystyle {\frac {1}{24}}+{\frac {1}{9}}+{\frac {11}{36}}+{\frac {5}{12}}=}$

2. Berechne und kürze mit 9...

a) ${\displaystyle {\frac {1}{24}}+{\frac {7}{18}}+{\frac {1}{12}}+{\frac {1}{9}}=}$
b) ${\displaystyle {\frac {5}{18}}+{\frac {1}{6}}+{\frac {1}{12}}+{\frac {2}{9}}=}$
c) ${\displaystyle {\frac {1}{14}}+{\frac {1}{6}}+{\frac {2}{7}}+{\frac {1}{21}}=}$

3. Berechne und kürze mit 6, 6...

a) ${\displaystyle {\frac {1}{6}}+{\frac {5}{14}}+{\frac {1}{21}}+{\frac {1}{7}}=}$
b) ${\displaystyle {\frac {7}{24}}+{\frac {1}{36}}+{\frac {5}{18}}+{\frac {1}{9}}=}$

4. Berechne und kürze mit 9...

a) ${\displaystyle {\frac {1}{14}}+{\frac {3}{7}}+{\frac {1}{28}}+{\frac {1}{8}}=}$
b) ${\displaystyle {\frac {1}{18}}+{\frac {13}{36}}+{\frac {1}{8}}+{\frac {1}{12}}=}$
c) ${\displaystyle {\frac {1}{6}}+{\frac {7}{12}}+{\frac {1}{18}}+{\frac {1}{9}}=}$

Lösungen

${\displaystyle {\frac {7}{8}}}$${\displaystyle {\frac {10}{9}}}$${\displaystyle {\frac {4}{7}}}$${\displaystyle {\frac {3}{4}}}$${\displaystyle {\frac {5}{7}}}$${\displaystyle {\frac {17}{24}}}$${\displaystyle {\frac {5}{8}}}$${\displaystyle {\frac {37}{56}}}$${\displaystyle {\frac {5}{8}}}$${\displaystyle {\frac {11}{12}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {25}{16}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {13}{9}}}$${\displaystyle {\frac {4}{7}}}$${\displaystyle {\frac {13}{4}}}$${\displaystyle {\frac {17}{27}}}$${\displaystyle {\frac {13}{24}}}$${\displaystyle {\frac {11}{9}}}$${\displaystyle {\frac {3}{8}}}$

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 2 und 3.

a) ${\displaystyle {\frac {2}{9}}+{\frac {5}{6}}+{\frac {1}{2}}+{\frac {4}{3}}=}$
b) ${\displaystyle {\frac {5}{12}}+{\frac {3}{8}}+{\frac {1}{3}}+{\frac {3}{4}}=}$

2. Berechne und kürze mit 9...

a) ${\displaystyle {\frac {1}{16}}+{\frac {5}{12}}+{\frac {1}{6}}+{\frac {1}{24}}=}$
b) ${\displaystyle {\frac {1}{6}}+{\frac {3}{4}}+{\frac {11}{18}}+{\frac {2}{9}}=}$
c) ${\displaystyle {\frac {3}{4}}+{\frac {5}{9}}+{\frac {1}{12}}+{\frac {5}{6}}=}$

3. Berechne und kürze mit 7, 4...

a) ${\displaystyle {\frac {1}{7}}+{\frac {1}{14}}+{\frac {1}{8}}+{\frac {1}{28}}=}$
b) ${\displaystyle {\frac {7}{10}}+{\frac {5}{8}}+{\frac {1}{20}}+{\frac {1}{4}}=}$

4. Berechne und kürze mit 5...

a) ${\displaystyle {\frac {1}{10}}+{\frac {1}{4}}+{\frac {2}{5}}+{\frac {1}{2}}=}$
b) ${\displaystyle {\frac {1}{16}}+{\frac {1}{10}}+{\frac {1}{20}}+{\frac {9}{40}}=}$
c) ${\displaystyle {\frac {5}{3}}+{\frac {7}{6}}+{\frac {2}{9}}+{\frac {1}{2}}=}$

Lösungen

${\displaystyle {\frac {26}{9}}}$${\displaystyle {\frac {15}{8}}}$${\displaystyle {\frac {11}{16}}}$${\displaystyle {\frac {7}{4}}}$${\displaystyle {\frac {3}{8}}}$${\displaystyle {\frac {5}{4}}}$${\displaystyle {\frac {20}{9}}}$${\displaystyle {\frac {32}{9}}}$${\displaystyle {\frac {7}{16}}}$${\displaystyle {\frac {8}{11}}}$${\displaystyle {\frac {13}{8}}}$${\displaystyle {\frac {33}{56}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {19}{20}}}$${\displaystyle {\frac {13}{18}}}$${\displaystyle {\frac {6}{11}}}$${\displaystyle {\frac {21}{16}}}$${\displaystyle {\frac {1}{2}}}$${\displaystyle {\frac {9}{16}}}$

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 12 und 6.

a) ${\displaystyle {\frac {1}{12}}+{\frac {1}{30}}+{\frac {2}{15}}+{\frac {3}{20}}=}$
b) ${\displaystyle {\frac {3}{22}}+{\frac {1}{6}}+{\frac {4}{11}}+{\frac {5}{33}}=}$

2. Berechne und kürze mit 30...

a) ${\displaystyle {\frac {1}{9}}+{\frac {1}{27}}+{\frac {1}{18}}+{\frac {1}{6}}=}$
b) ${\displaystyle {\frac {1}{4}}+{\frac {1}{6}}+{\frac {1}{18}}+{\frac {1}{9}}=}$
c) ${\displaystyle {\frac {7}{10}}+{\frac {5}{6}}+{\frac {1}{3}}+{\frac {2}{15}}=}$

3. Berechne und kürze mit 22, 30...

a) ${\displaystyle {\frac {1}{6}}+{\frac {1}{33}}+{\frac {1}{11}}+{\frac {1}{22}}=}$
b) ${\displaystyle {\frac {5}{12}}+{\frac {9}{20}}+{\frac {1}{6}}+{\frac {2}{15}}=}$

4. Berechne und kürze mit 24...

a) ${\displaystyle {\frac {3}{8}}+{\frac {1}{9}}+{\frac {1}{24}}+{\frac {5}{36}}=}$
b) ${\displaystyle {\frac {3}{20}}+{\frac {1}{8}}+{\frac {1}{16}}+{\frac {1}{10}}=}$
c) ${\displaystyle {\frac {1}{9}}+{\frac {5}{24}}+{\frac {11}{36}}+{\frac {1}{8}}=}$

Lösungen

${\displaystyle {\frac {2}{5}}}$${\displaystyle {\frac {10}{27}}}$${\displaystyle {\frac {9}{11}}}$${\displaystyle {\frac {7}{12}}}$${\displaystyle {\frac {1}{3}}}$${\displaystyle {\frac {7}{16}}}$${\displaystyle {\frac {2}{1}}}$${\displaystyle {\frac {3}{4}}}$${\displaystyle {\frac {7}{6}}}$${\displaystyle {\frac {7}{4}}}$${\displaystyle {\frac {2}{3}}}$${\displaystyle {\frac {17}{16}}}$${\displaystyle {\frac {23}{9}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {17}{20}}}$${\displaystyle {\frac {21}{10}}}$${\displaystyle {\frac {4}{3}}}$${\displaystyle {\frac {43}{40}}}$${\displaystyle {\frac {1}{2}}}$${\displaystyle {\frac {6}{5}}}$

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 3 und 2.

a) ${\displaystyle {\frac {5}{18}}+{\frac {1}{9}}+{\frac {1}{36}}+{\frac {1}{8}}=}$
b) ${\displaystyle {\frac {1}{2}}+{\frac {1}{6}}+{\frac {11}{9}}+{\frac {1}{3}}=}$

2. Berechne und kürze mit 20...

a) ${\displaystyle {\frac {1}{20}}+{\frac {1}{12}}+{\frac {3}{10}}+{\frac {7}{30}}=}$
b) ${\displaystyle {\frac {1}{12}}+{\frac {1}{6}}+{\frac {1}{9}}+{\frac {1}{18}}=}$
c) ${\displaystyle {\frac {7}{9}}+{\frac {5}{6}}+{\frac {1}{2}}+{\frac {1}{3}}=}$

3. Berechne und kürze mit 42, 2...

a) ${\displaystyle {\frac {1}{21}}+{\frac {1}{6}}+{\frac {9}{14}}+{\frac {1}{7}}=}$
b) ${\displaystyle {\frac {7}{20}}+{\frac {1}{6}}+{\frac {11}{30}}+{\frac {1}{15}}=}$

4. Berechne und kürze mit 3...

a) ${\displaystyle {\frac {1}{6}}+{\frac {1}{20}}+{\frac {1}{30}}+{\frac {1}{10}}=}$
b) ${\displaystyle {\frac {1}{18}}+{\frac {1}{12}}+{\frac {1}{6}}+{\frac {1}{9}}=}$
c) ${\displaystyle {\frac {1}{18}}+{\frac {1}{9}}+{\frac {1}{4}}+{\frac {1}{12}}=}$

Lösungen

${\displaystyle {\frac {2}{3}}}$${\displaystyle {\frac {13}{24}}}$${\displaystyle {\frac {5}{12}}}$${\displaystyle {\frac {20}{9}}}$${\displaystyle {\frac {22}{9}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {19}{20}}}$${\displaystyle {\frac {7}{20}}}$${\displaystyle {\frac {1}{2}}}$${\displaystyle {\frac {13}{8}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {5}{12}}}$${\displaystyle {\frac {7}{8}}}$${\displaystyle {\frac {13}{16}}}$${\displaystyle {\frac {10}{11}}}$${\displaystyle {\frac {11}{8}}}$${\displaystyle {\frac {5}{8}}}$${\displaystyle {\frac {7}{16}}}$${\displaystyle {\frac {13}{8}}}$${\displaystyle {\frac {9}{8}}}$

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 20 und 5.

a) ${\displaystyle {\frac {1}{12}}+{\frac {1}{20}}+{\frac {1}{30}}+{\frac {1}{6}}=}$
b) ${\displaystyle {\frac {1}{16}}+{\frac {1}{10}}+{\frac {3}{20}}+{\frac {1}{8}}=}$

2. Berechne und kürze mit 8...

a) ${\displaystyle {\frac {1}{8}}+{\frac {1}{14}}+{\frac {9}{28}}+{\frac {2}{7}}=}$
b) ${\displaystyle {\frac {3}{8}}+{\frac {7}{20}}+{\frac {1}{4}}+{\frac {7}{10}}=}$
c) ${\displaystyle {\frac {5}{12}}+{\frac {1}{9}}+{\frac {3}{8}}+{\frac {5}{24}}=}$

3. Berechne und kürze mit 3, 8...

a) ${\displaystyle {\frac {3}{2}}+{\frac {1}{3}}+{\frac {1}{6}}+{\frac {5}{4}}=}$
b) ${\displaystyle {\frac {1}{7}}+{\frac {1}{28}}+{\frac {1}{8}}+{\frac {1}{14}}=}$

4. Berechne und kürze mit 9...

a) ${\displaystyle {\frac {1}{9}}+{\frac {3}{4}}+{\frac {13}{18}}+{\frac {1}{6}}=}$
b) ${\displaystyle {\frac {3}{8}}+{\frac {5}{6}}+{\frac {1}{3}}+{\frac {7}{12}}=}$
c) ${\displaystyle {\frac {5}{14}}+{\frac {1}{6}}+{\frac {1}{21}}+{\frac {1}{7}}=}$

Lösungen

${\displaystyle {\frac {10}{9}}}$${\displaystyle {\frac {1}{3}}}$${\displaystyle {\frac {7}{16}}}$${\displaystyle {\frac {45}{56}}}$${\displaystyle {\frac {67}{40}}}$${\displaystyle {\frac {13}{4}}}$${\displaystyle {\frac {7}{4}}}$${\displaystyle {\frac {3}{8}}}$${\displaystyle {\frac {17}{8}}}$${\displaystyle {\frac {11}{9}}}$${\displaystyle {\frac {7}{16}}}$${\displaystyle {\frac {5}{7}}}$${\displaystyle {\frac {23}{4}}}$${\displaystyle {\frac {2}{5}}}$${\displaystyle {\frac {17}{12}}}$${\displaystyle {\frac {43}{72}}}$${\displaystyle {\frac {7}{24}}}$${\displaystyle {\frac {47}{40}}}$${\displaystyle {\frac {5}{4}}}$${\displaystyle {\frac {17}{9}}}$

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 3 und 5.

a) ${\displaystyle {\frac {1}{4}}+{\frac {7}{6}}+{\frac {1}{2}}+{\frac {7}{3}}=}$
b) ${\displaystyle {\frac {1}{8}}+{\frac {1}{10}}+{\frac {3}{20}}+{\frac {1}{4}}=}$

2. Berechne und kürze mit 30...

a) ${\displaystyle {\frac {1}{3}}+{\frac {5}{6}}+{\frac {11}{15}}+{\frac {1}{10}}=}$
b) ${\displaystyle {\frac {2}{3}}+{\frac {1}{6}}+{\frac {1}{2}}+{\frac {5}{9}}=}$
c) ${\displaystyle {\frac {1}{21}}+{\frac {3}{7}}+{\frac {1}{14}}+{\frac {1}{6}}=}$

3. Berechne und kürze mit 6, 6...

a) ${\displaystyle {\frac {1}{6}}+{\frac {1}{15}}+{\frac {2}{3}}+{\frac {3}{10}}=}$
b) ${\displaystyle {\frac {1}{10}}+{\frac {1}{4}}+{\frac {2}{5}}+{\frac {3}{2}}=}$

4. Berechne und kürze mit 9...

a) ${\displaystyle {\frac {1}{9}}+{\frac {7}{6}}+{\frac {3}{2}}+{\frac {1}{3}}=}$
b) ${\displaystyle {\frac {5}{9}}+{\frac {11}{18}}+{\frac {1}{4}}+{\frac {5}{6}}=}$
c) ${\displaystyle {\frac {5}{12}}+{\frac {2}{9}}+{\frac {3}{4}}+{\frac {11}{18}}=}$

Lösungen

${\displaystyle {\frac {17}{4}}}$${\displaystyle {\frac {5}{8}}}$${\displaystyle {\frac {5}{7}}}$${\displaystyle {\frac {2}{1}}}$${\displaystyle {\frac {9}{4}}}$${\displaystyle {\frac {17}{9}}}$${\displaystyle {\frac {28}{9}}}$${\displaystyle {\frac {6}{5}}}$${\displaystyle {\frac {9}{4}}}$${\displaystyle {\frac {25}{48}}}$${\displaystyle {\frac {7}{3}}}$${\displaystyle {\frac {2}{1}}}$${\displaystyle {\frac {17}{4}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {1}{3}}}$${\displaystyle {\frac {7}{4}}}$${\displaystyle {\frac {9}{16}}}$${\displaystyle {\frac {16}{9}}}$${\displaystyle {\frac {5}{4}}}$${\displaystyle {\frac {6}{5}}}$

Berechne und kürze wenn möglich.

1. Berechne und kürze mit 9 und 5.

a) ${\displaystyle {\frac {1}{24}}+{\frac {5}{12}}+{\frac {1}{18}}+{\frac {1}{9}}=}$
b) ${\displaystyle {\frac {1}{20}}+{\frac {11}{40}}+{\frac {1}{16}}+{\frac {3}{10}}=}$

2. Berechne und kürze mit 14...

a) ${\displaystyle {\frac {1}{24}}+{\frac {1}{12}}+{\frac {5}{16}}+{\frac {1}{6}}=}$
b) ${\displaystyle {\frac {1}{28}}+{\frac {1}{7}}+{\frac {3}{8}}+{\frac {1}{14}}=}$
c) ${\displaystyle {\frac {1}{6}}+{\frac {1}{14}}+{\frac {4}{7}}+{\frac {11}{21}}=}$

3. Berechne und kürze mit 12, 14...

a) ${\displaystyle {\frac {1}{6}}+{\frac {7}{20}}+{\frac {4}{15}}+{\frac {5}{12}}=}$
b) ${\displaystyle {\frac {2}{15}}+{\frac {1}{20}}+{\frac {1}{6}}+{\frac {7}{30}}=}$

4. Berechne und kürze mit 60...

a) ${\displaystyle {\frac {7}{20}}+{\frac {13}{30}}+{\frac {2}{15}}+{\frac {1}{12}}=}$
b) ${\displaystyle {\frac {3}{10}}+{\frac {3}{5}}+{\frac {7}{15}}+{\frac {1}{3}}=}$
c) ${\displaystyle {\frac {7}{27}}+{\frac {1}{18}}+{\frac {5}{9}}+{\frac {1}{6}}=}$

Lösungen

${\displaystyle {\frac {11}{16}}}$${\displaystyle {\frac {4}{3}}}$${\displaystyle {\frac {5}{8}}}$${\displaystyle {\frac {6}{5}}}$${\displaystyle {\frac {17}{10}}}$${\displaystyle {\frac {5}{8}}}$${\displaystyle {\frac {28}{27}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {29}{48}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {3}{2}}}$${\displaystyle {\frac {17}{48}}}$${\displaystyle {\frac {7}{12}}}$${\displaystyle {\frac {7}{9}}}$${\displaystyle {\frac {3}{4}}}$${\displaystyle {\frac {1}{1}}}$${\displaystyle {\frac {15}{16}}}$${\displaystyle {\frac {3}{4}}}$${\displaystyle {\frac {7}{6}}}$${\displaystyle {\frac {33}{80}}}$