2)425 × 1577 = 2 + 4·55 × 1577 = 225 × 1577 = 22·155·77 = 330385 = 6·557·55 = 67 ≈ 0.8571428571428571
5)637 × 213 = 3 + 6·77 × 1 + 2·33 = 457 × 73 = 45·77·3 = 31521 = 15·2121 = 15
8)416 × 225 = 1 + 4·66 × 2 + 2·55 = 256 × 125 = 25·126·5 = 30030 = 10·3030 = 10