No problem, we've got 8390 and 1991 to multiply
8390 × 1991 = 1991 × (8390)
+ 1991 × 0 yielding 0
+ 1991 × 90 that equals 179190
+ 1991 × 300 resulting in 597300
+ 1991 × 8000 which equals 15928000

= 16704490
