No problem, we've got 4084 and 4200 to multiply
4084 × 4200 = 4200 × (4084)
+ 4200 × 4 what gives us 16800
+ 4200 × 80 resulting in 336000
+ 4200 × 000 what gives us 0
+ 4200 × 4000 which equals 16800000

= 17152800
