Alright, let's work through 8000 times 9645 step by step
8000 × 9645 = 9645 × (8000)
+ 9645 × 0 yielding 0
+ 9645 × 00 that results in 0
+ 9645 × 000 that is equal 0
+ 9645 × 8000 yielding 77160000

= 77160000
