Alright, let's work through 8360 times 8638 step by step
8360 × 8638 = 8638 × (8360)
+ 8638 × 0 that is equal 0
+ 8638 × 60 yielding 518280
+ 8638 × 300 producing 2591400
+ 8638 × 8000 that results in 69104000

= 72213680
