Alright, let's work through 6340 times 8474 step by step
6340 × 8474 = 8474 × (6340)
+ 8474 × 0 that equals 0
+ 8474 × 40 giving us 338960
+ 8474 × 300 producing 2542200
+ 8474 × 6000 producing 50844000

= 53725160
