Alright, let's work through 8991 times 8897 step by step
8991 × 8897 = 8897 × (8991)
+ 8897 × 1 yielding 8897
+ 8897 × 90 which equals 800730
+ 8897 × 900 yielding 8007300
+ 8897 × 8000 resulting in 71176000

= 79992927
