Alright, let's work through 8680 times 8079 step by step
8680 × 8079 = 8079 × (8680)
+ 8079 × 0 that is equal 0
+ 8079 × 80 yielding 646320
+ 8079 × 600 producing 4847400
+ 8079 × 8000 producing 64632000

= 70125720
