Alright, let's work through 9887 times 8636 step by step
9887 × 8636 = 8636 × (9887)
+ 8636 × 7 producing 60452
+ 8636 × 80 giving us 690880
+ 8636 × 800 what gives us 6908800
+ 8636 × 9000 producing 77724000

= 85384132
