Alright, let's work through 6387 times 8515 step by step
6387 × 8515 = 8515 × (6387)
+ 8515 × 7 producing 59605
+ 8515 × 80 giving us 681200
+ 8515 × 300 resulting in 2554500
+ 8515 × 6000 giving us 51090000

= 54385305
