400-208, 504-397, 109×6, 205×4, 168×4, 168:4, 648:6, 927:9

1. $$\begin{array}{r}400 \\ - \\208 \\ \hline 192 \end{array}$$
2. $$\begin{array}{r}504 \\ - \\397 \\ \hline 107 \end{array}$$
3. $$\begin{array}{r}109 \\ \times \\6 \\ \hline 654 \end{array}$$
4. $$\begin{array}{r}205 \\ \times \\4 \\ \hline 820 \end{array}$$
5. $$\begin{array}{r}168 \\ \times \\4 \\ \hline 672 \end{array}$$
6. $$\begin{array}{r}168 \\ : \\4 \\ \hline 42 \end{array}$$
7. $$\begin{array}{r}648 \\ : \\6 \\ \hline 108 \end{array}$$
8. $$\begin{array}{r}927 \\ : \\9 \\ \hline 103 \end{array}$$

Ответ: 400-208 = 192; 504-397 = 107; 109×6 = 654; 205×4 = 820; 168×4 = 672; 168:4 = 42; 648:6 = 108; 927:9 = 103.