d) [tex]\frac{4}{7} - \frac{1}{4} = \frac{24}{42} - \frac{7}{42} = \frac{17}{42}[/tex]
e) [tex]\frac{3}{7} + \frac{1}{4} = \frac{12}{28} + \frac{7}{28} = \frac{19}{28}[/tex]
f) [tex]\frac{1}{2} - \frac{3}{9} = \frac{1}{2} - \frac{1}{3} = \frac{3}{6} - \frac{2}{6} = \frac{1}{6}[/tex]
d) [tex]\frac{2}{3} - \frac{2}{4} = \frac{2}{3} - \frac{1}{2} = \frac{4}{6} - \frac{3}{6} = \frac{1}{6}[/tex]
e) [tex]\frac{5}{9} + \frac{1}{2} = \frac{10}{18} +\frac{9}{18} = \frac{19}{18} = 1\frac{1}{18}[/tex]
f) [tex]\frac{5}{7} + \frac{2}{3} = \frac{15}{21} + \frac{14}{21} = \frac{29}{21} = 1\frac{8}{21}[/tex]
d) [tex]\frac{4}{9} - \frac{5}{12} = \frac{16}{36} - \frac{15}{36} = \frac{1}{36}[/tex]
e) [tex]\frac{7}{15} + \frac{9}{10} = \frac{14}{30} + \frac{27}{30} = \frac{41}{30} = 1\frac{11}{30}[/tex]
f) [tex]\frac{5}{6} - \frac{5}{9} = \frac{15}{18} - \frac{10}{18} = \frac{5}{18}[/tex]
d) [tex]3\frac{2}{9} + 1\frac{5}{6} = 3\frac{4}{18} + 1\frac{15}{18} = 4\frac{19}{18} = 5\frac{1}{18}[/tex]
e) [tex]7\frac{3}{4} - 5\frac{1}{3} = 7\frac{9}{12} - 5\frac{4}{12} = 2\frac{5}{12}[/tex]
f) [tex]4\frac{2}{15} + 2\frac{7}{10} = 4\frac{4}{30} + 2\frac{21}{30} = 6\frac{25}{30} = 6\frac{5}{6}[/tex]
