Alright, let's work through 6715 times 5984 step by step
6715 × 5984 = 5984 × (6715)
+ 5984 × 5 that results in 29920
+ 5984 × 10 producing 59840
+ 5984 × 700 resulting in 4188800
+ 5984 × 6000 giving us 35904000

= 40182560
