No problem, we've got 8400 and 1054 to multiply
8400 × 1054 = 1054 × (8400)
+ 1054 × 0 which equals 0
+ 1054 × 00 what gives us 0
+ 1054 × 400 what gives us 421600
+ 1054 × 8000 yielding 8432000

= 8853600
