a)

= $\frac{8}{5}$ - $\frac{4}{5}$ = $\frac{4}{5}$

=4 $\frac{4}{3}$ -1 $\frac{2}{3}$ =3 $\frac{2}{3}$

=2 $\frac{41}{36}$ -2 $\frac{13}{36}$ = $\frac{28}{36}$ = $\frac{7}{9}$

=7 $\frac{4}{3}$ -1 $\frac{4}{3}$ =6

b)

=5 $\frac{4}{3}$ - $\frac{2}{3}$ =5 $\frac{2}{3}$

=6 $\frac{5}{4}$ -3 $\frac{3}{4}$ =3 $\frac{2}{4}$ =3 $\frac{1}{2}$

=11 $\frac{49}{45}$ -9 $\frac{27}{45}$ =2 $\frac{22}{45}$

=12 $\frac{12}{5}$ - $\frac{11}{5}$ =12 $\frac{1}{5}$

c)

=11 $\frac{19}{12}$ - $\frac{11}{12}$ =11 $\frac{8}{12}$ =11 $\frac{2}{3}$

=9 $\frac{13}{8}$ -7 $\frac{7}{8}$ =2 $\frac{6}{8}$ =2 $\frac{3}{4}$

=81 $\frac{67}{60}$ -31 $\frac{31}{60}$ =50 $\frac{36}{60}$ =50 $\frac{3}{5}$

=16 $\frac{24}{7}$ -8 $\frac{19}{7}$ =8 $\frac{5}{7}$

d)

=29 $\frac{29}{18}$ - $\frac{17}{18}$ =29 $\frac{12}{18}$ =29 $\frac{2}{3}$

=19 $\frac{14}{9}$ -10 $\frac{7}{9}$ =9 $\frac{7}{9}$

=101 $\frac{43}{39}$ -61 $\frac{25}{39}$ =40 $\frac{18}{39}$

=31 $\frac{53}{10}$ -16 $\frac{49}{10}$ =15 $\frac{4}{10}$ =15 $\frac{2}{5}$