Alright, let's work through 8991 times 8836 step by step
8991 × 8836 = 8836 × (8991)
+ 8836 × 1 that is equal 8836
+ 8836 × 90 yielding 795240
+ 8836 × 900 resulting in 7952400
+ 8836 × 8000 producing 70688000

= 79444476
