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5)
$2 \frac{2}{5} \times \frac{5}{6} = \frac{12}{5} \times \frac{5}{6} = 2$
$\frac{3}{4} \times 1 \frac{2}{3} = \frac{3}{4} \times \frac{5}{3} = \frac{5}{4} = 1 \frac{1}{4}$
$2 - 1 \frac{1}{4} = 1 \frac{4}{4} - 1 \frac{1}{4} = \frac{3}{4}$
6)
$\frac{45}{28} \times \frac{7}{9} = \frac{5}{4} = 1 \frac{1}{4}$
$\frac{14}{25} \times \frac{5}{7} = \frac{2}{5}$
$1 \frac{1}{4} + \frac{2}{5} = 1 \frac{5}{20} + \frac{8}{20} = 1 \frac{13}{20}$