No problem, we've got 6851 and 3158 to multiply
6851 × 3158 = 3158 × (6851)
+ 3158 × 1 giving us 3158
+ 3158 × 50 producing 157900
+ 3158 × 800 that is equal 2526400
+ 3158 × 6000 resulting in 18948000

= 21635458
