No problem, we've got 3981 and 7643 to multiply
3981 × 7643 = 7643 × (3981)
+ 7643 × 1 producing 7643
+ 7643 × 80 that results in 611440
+ 7643 × 900 what gives us 6878700
+ 7643 × 3000 which equals 22929000

= 30426783
