Alright, let's work through 7880 times 8503 step by step
7880 × 8503 = 8503 × (7880)
+ 8503 × 0 producing 0
+ 8503 × 80 what gives us 680240
+ 8503 × 800 producing 6802400
+ 8503 × 7000 giving us 59521000

= 67003640
