Alright, let's work through 8989 times 8987 step by step
8989 × 8987 = 8987 × (8989)
+ 8987 × 9 that is equal 80883
+ 8987 × 80 that is equal 718960
+ 8987 × 900 that is equal 8088300
+ 8987 × 8000 resulting in 71896000

= 80784143
