No problem, we've got 8390 and 2551 to multiply
8390 × 2551 = 2551 × (8390)
+ 2551 × 0 that is equal 0
+ 2551 × 90 what gives us 229590
+ 2551 × 300 that is equal 765300
+ 2551 × 8000 producing 20408000

= 21402890
