Alright, let's work through 6400 times 4355 step by step
6400 × 4355 = 4355 × (6400)
+ 4355 × 0 yielding 0
+ 4355 × 00 yielding 0
+ 4355 × 400 giving us 1742000
+ 4355 × 6000 what gives us 26130000

= 27872000
