No problem, we've got 6310 and 6670 to multiply
6310 × 6670 = 6670 × (6310)
+ 6670 × 0 that is equal 0
+ 6670 × 10 producing 66700
+ 6670 × 300 that is equal 2001000
+ 6670 × 6000 producing 40020000

= 42087700
