Alright, let's work through 9888 times 789 step by step
9888 × 789 = 789 × (9888)
+ 789 × 8 which equals 6312
+ 789 × 80 yielding 63120
+ 789 × 800 that is equal 631200
+ 789 × 9000 that is equal 7101000

= 7801632
