- $$21 : 3 \times 8 = 7 \times 8 = 56$$
- $$28 : 4 \times 9 = 7 \times 9 = 63$$
- $$54 : 6 \times 7 = 9 \times 7 = 63$$
- $$45 : 5 \times 6 = 9 \times 6 = 54$$
- $$32 : 8 \times 4 = 4 \times 4 = 16$$
- $$27 : 3 \times 5 = 9 \times 5 = 45$$
Ответ: 56, 63, 63, 54, 16, 45