Alright, let's work through 8160 times 9856 step by step
8160 × 9856 = 9856 × (8160)
+ 9856 × 0 yielding 0
+ 9856 × 60 yielding 591360
+ 9856 × 100 that equals 985600
+ 9856 × 8000 that equals 78848000

= 80424960
