Alright, let's work through 8240 times 9657 step by step
8240 × 9657 = 9657 × (8240)
+ 9657 × 0 producing 0
+ 9657 × 40 that is equal 386280
+ 9657 × 200 which equals 1931400
+ 9657 × 8000 which equals 77256000

= 79573680
