Alright, let's work through 8243 times 9936 step by step
8243 × 9936 = 9936 × (8243)
+ 9936 × 3 what gives us 29808
+ 9936 × 40 yielding 397440
+ 9936 × 200 what gives us 1987200
+ 9936 × 8000 producing 79488000

= 81902448
