99:20; 351:4; 629:6; 5:6

Определим значения выражений:

1. $$99:20 = 4 \frac{19}{20} = 4.95$$
2. $$351:4 = 87 \frac{3}{4} = 87.75$$
3. $$629:6 = 104 \frac{5}{6} \approx 104.83$$
4. $$5:6 \approx 0.83$$

Ответ:

1. $$99:20 = 4.95$$
2. $$351:4 = 87.75$$
3. $$629:6 = 104.83$$
4. $$5:6 = 0.83$$