No problem, we've got 4155 and 5631 to multiply
4155 × 5631 = 5631 × (4155)
+ 5631 × 5 which equals 28155
+ 5631 × 50 producing 281550
+ 5631 × 100 that is equal 563100
+ 5631 × 4000 producing 22524000

= 23396805
