[tex] \frac{125}{100} \times \frac{8}{7} = \frac{5}{4} \times \frac{8}{7} = \frac{10}{7} [/tex]
[tex] \frac{5}{4} \times ( - \frac{1}{5} ) = - \frac{1}{4} [/tex]
[tex]( - 5 \times a) \times \frac{2}{b } = - 10 \times \frac{a}{b} = - 10 \times \frac{5}{4} = - \frac{25}{2} [/tex]
[tex] \frac{a}{5} \times ( - \frac{4}{b} ) = - \frac{4}{5} \times \frac{a}{b} = - \frac{4}{5} \times \frac{5}{4} = - 1[/tex]
