Alright, let's work through 9984 times 8454 step by step
9984 × 8454 = 8454 × (9984)
+ 8454 × 4 resulting in 33816
+ 8454 × 80 that is equal 676320
+ 8454 × 900 that equals 7608600
+ 8454 × 9000 that equals 76086000

= 84404736
