No problem, we've got 4420 and 3555 to multiply
4420 × 3555 = 3555 × (4420)
+ 3555 × 0 giving us 0
+ 3555 × 20 giving us 71100
+ 3555 × 400 what gives us 1422000
+ 3555 × 4000 producing 14220000

= 15713100
