4. $$4 \times \frac{5}{12} = \frac{4}{1} \times \frac{5}{12} = \frac{4 \times 5}{1 \times 12} = \frac{20}{12} = \frac{5}{3} = 1\frac{2}{3}$$
Ответ: $$1\frac{2}{3}$$