Question

7/8-8/10 substracting with unlike denominators

Answer 1

$\begin{gathered} \frac{7}{8}-\frac{8}{10}=\frac{7\times10-8\times8}{8\times10} \\ \\ =\frac{70-64}{80} \\ =\frac{6}{80} \\ \\ =\frac{3}{40} \end{gathered}$