Alright, let's work through 8157 times 9767 step by step
8157 × 9767 = 9767 × (8157)
+ 9767 × 7 resulting in 68369
+ 9767 × 50 what gives us 488350
+ 9767 × 100 what gives us 976700
+ 9767 × 8000 that is equal 78136000

= 79669419
