Alright, let's work through 9999 times 7865 step by step
9999 × 7865 = 7865 × (9999)
+ 7865 × 9 that results in 70785
+ 7865 × 90 that is equal 707850
+ 7865 × 900 that equals 7078500
+ 7865 × 9000 producing 70785000

= 78642135
