Alright, let's work through 8257 times 8720 step by step
8257 × 8720 = 8720 × (8257)
+ 8720 × 7 that is equal 61040
+ 8720 × 50 which equals 436000
+ 8720 × 200 which equals 1744000
+ 8720 × 8000 that results in 69760000

= 72001040
