10) 5/6 * 4

10) $$ \frac{5}{6} \cdot 4 = \frac{5 \cdot 4}{6} = \frac{5 \cdot 2 \cdot 2}{2 \cdot 3} = \frac{10}{3} = 3\frac{1}{3} $$

Ответ: $$3\frac{1}{3}$$