Alright, let's work through 8989 times 9001 step by step
8989 × 9001 = 9001 × (8989)
+ 9001 × 9 giving us 81009
+ 9001 × 80 yielding 720080
+ 9001 × 900 that is equal 8100900
+ 9001 × 8000 that results in 72008000

= 80909989
