No problem, we've got 3855 and 1055 to multiply
3855 × 1055 = 1055 × (3855)
+ 1055 × 5 what gives us 5275
+ 1055 × 50 giving us 52750
+ 1055 × 800 that is equal 844000
+ 1055 × 3000 that is equal 3165000

= 4067025
