No problem, we've got 4155 and 2156 to multiply
4155 × 2156 = 2156 × (4155)
+ 2156 × 5 which equals 10780
+ 2156 × 50 that equals 107800
+ 2156 × 100 that is equal 215600
+ 2156 × 4000 what gives us 8624000

= 8958180
