Alright, let's work through 8520 times 9013 step by step
8520 × 9013 = 9013 × (8520)
+ 9013 × 0 giving us 0
+ 9013 × 20 giving us 180260
+ 9013 × 500 yielding 4506500
+ 9013 × 8000 producing 72104000

= 76790760
