Rekenen met breuken
Bereken.
1p
\(\frac{4}{7} ⋅ -\frac{1}{6}\)
○
\(\frac{4}{7} ⋅ -\frac{1}{6} = -\frac{4}{42} = -\frac{2}{21}\)
1p
Bereken.
1p
\(-1\frac{2}{9} ⋅ \frac{1}{5}\)
○
\(-1\frac{2}{9} ⋅ \frac{1}{5} = -\frac{11}{9} ⋅ \frac{1}{5} = -\frac{11}{45}\)
1p
Bereken.
1p
\(1\frac{2}{7} ⋅ -1\frac{2}{9}\)
○
\(1\frac{2}{7} ⋅ -1\frac{2}{9} = \frac{9}{7} ⋅ -\frac{11}{9} = -\frac{99}{63} = -\frac{11}{7} = -1\frac{4}{7}\)
1p
Bereken.
1p
\(\frac{1}{5} ⋅ -2\)
○
\(\frac{1}{5} ⋅ -2 = \frac{1}{5} ⋅ -\frac{2}{1} = -\frac{2}{5}\)
1p
Bereken.
1p
\(\frac{3}{7} : -\frac{3}{7}\)
○
\(\frac{3}{7} : -\frac{3}{7} = \frac{3}{7} ⋅ -\frac{7}{3} = -\frac{21}{21} = -\frac{1}{1}\)
1p
Bereken.
1p
\(-\frac{1}{5} : 1\frac{2}{5}\)
○
\(-\frac{1}{5} : 1\frac{2}{5} = -\frac{1}{5} : \frac{7}{5} = -\frac{1}{5} ⋅ \frac{5}{7} = -\frac{5}{35} = -\frac{1}{7}\)
1p
Bereken.
1p
\(-2\frac{5}{8} : 2\frac{1}{2}\)
○
\(-2\frac{5}{8} : 2\frac{1}{2} = -\frac{21}{8} : \frac{5}{2} = -\frac{21}{8} ⋅ \frac{2}{5} = -\frac{42}{40} = -\frac{21}{20} = -1\frac{1}{20}\)
1p
Bereken.
1p
\(1\frac{1}{3} : 10\)
○
\(1\frac{1}{3} : 10 = \frac{4}{3} : \frac{10}{1} = \frac{4}{3} ⋅ \frac{1}{10} = \frac{4}{30} = \frac{2}{15}\)
1p
Bereken.
1p
\(-\frac{7}{8} - \frac{3}{8}\)
○
\(-\frac{7}{8} - \frac{3}{8} = -\frac{10}{8} = -\frac{5}{4} = -1\frac{1}{4}\)
1p
Bereken.
1p
\(\frac{1}{2} + \frac{1}{9}\)
○
\(\frac{1}{2} + \frac{1}{9} = {9 \over 18} + {2 \over 18} = \frac{11}{18}\)
1p
Bereken.
1p
\(-\frac{5}{6} - \frac{1}{2}\)
○
\(-\frac{5}{6} - \frac{1}{2} = {-5 \over 6} - {3 \over 6} = -\frac{8}{6} = -\frac{4}{3} = -1\frac{1}{3}\)
1p
Bereken.
1p
\(2\frac{5}{6} + 1\frac{7}{9}\)
○
\(2\frac{5}{6} + 1\frac{7}{9} = \frac{17}{6} + \frac{16}{9} = {51 \over 18} + {32 \over 18} = \frac{83}{18} = 4\frac{11}{18}\)
1p