No problem, we've got 5680 and 85 to multiply
5680 × 85 = 85 × (5680)
+ 85 × 0 what gives us 0
+ 85 × 80 what gives us 6800
+ 85 × 600 that results in 51000
+ 85 × 5000 what gives us 425000

= 482800
