No problem, we've got 6615 and 3112 to multiply
6615 × 3112 = 3112 × (6615)
+ 3112 × 5 what gives us 15560
+ 3112 × 10 giving us 31120
+ 3112 × 600 what gives us 1867200
+ 3112 × 6000 producing 18672000

= 20585880
