No problem, we've got 4205 and 1531 to multiply
4205 × 1531 = 1531 × (4205)
+ 1531 × 5 what gives us 7655
+ 1531 × 00 yielding 0
+ 1531 × 200 producing 306200
+ 1531 × 4000 yielding 6124000

= 6437855
