Alright, let's work through 80437854 times 99415469 step by step
80437854 × 99415469 = 99415469 × (80437854)
+ 99415469 × 4 which equals 397661876
+ 99415469 × 50 yielding 4970773450
+ 99415469 × 800 yielding 79532375200
+ 99415469 × 7000 that results in 695908283000
+ 99415469 × 30000 that results in 2982464070000
+ 99415469 × 400000 that equals 39766187600000
+ 99415469 × 0000000 which equals 0
+ 99415469 × 80000000 which equals 7953237520000000

= 7996766980763526
