Замените равенство \(16 \cdot 5 = 8 \cdot 10\) пропорцией
\(\frac{16}{10} = \frac85\)
\(\frac{16}8=\frac{5}{10}\)
\(\frac{16}{5}=\frac{10}8\)
\(\frac{16}8=\frac{10}5\)