Alright, let's work through 8140 times 7757 step by step
8140 × 7757 = 7757 × (8140)
+ 7757 × 0 what gives us 0
+ 7757 × 40 yielding 310280
+ 7757 × 100 yielding 775700
+ 7757 × 8000 giving us 62056000

= 63141980
