Alright, let's work through 9987 times 5389 step by step
9987 × 5389 = 5389 × (9987)
+ 5389 × 7 that results in 37723
+ 5389 × 80 that results in 431120
+ 5389 × 900 that results in 4850100
+ 5389 × 9000 that results in 48501000

= 53819943
