Alright, let's work through 8480 times 8440 step by step
8480 × 8440 = 8440 × (8480)
+ 8440 × 0 what gives us 0
+ 8440 × 80 yielding 675200
+ 8440 × 400 what gives us 3376000
+ 8440 × 8000 resulting in 67520000

= 71571200
