Alright, let's work through 8140 times 7803 step by step
8140 × 7803 = 7803 × (8140)
+ 7803 × 0 giving us 0
+ 7803 × 40 that results in 312120
+ 7803 × 100 yielding 780300
+ 7803 × 8000 what gives us 62424000

= 63516420
