No problem, we've got 4020 and 3146 to multiply
4020 × 3146 = 3146 × (4020)
+ 3146 × 0 that results in 0
+ 3146 × 20 yielding 62920
+ 3146 × 000 which equals 0
+ 3146 × 4000 what gives us 12584000

= 12646920
