Alright, let's work through 9951 times 8102 step by step
9951 × 8102 = 8102 × (9951)
+ 8102 × 1 producing 8102
+ 8102 × 50 which equals 405100
+ 8102 × 900 that is equal 7291800
+ 8102 × 9000 producing 72918000

= 80623002
