Alright, let's work through 6400 times 2974 step by step
6400 × 2974 = 2974 × (6400)
+ 2974 × 0 giving us 0
+ 2974 × 00 yielding 0
+ 2974 × 400 giving us 1189600
+ 2974 × 6000 giving us 17844000

= 19033600
