Alright, let's work through 8509 times 9919 step by step
8509 × 9919 = 9919 × (8509)
+ 9919 × 9 giving us 89271
+ 9919 × 00 resulting in 0
+ 9919 × 500 producing 4959500
+ 9919 × 8000 giving us 79352000

= 84400771
