No problem, we've got 8423 and 5102 to multiply
8423 × 5102 = 5102 × (8423)
+ 5102 × 3 what gives us 15306
+ 5102 × 20 that equals 102040
+ 5102 × 400 that equals 2040800
+ 5102 × 8000 which equals 40816000

= 42974146
