Alright, let's work through 6400 times 1317 step by step
6400 × 1317 = 1317 × (6400)
+ 1317 × 0 what gives us 0
+ 1317 × 00 yielding 0
+ 1317 × 400 producing 526800
+ 1317 × 6000 what gives us 7902000

= 8428800
