Alright, let's work through 8432 times 9891 step by step
8432 × 9891 = 9891 × (8432)
+ 9891 × 2 that equals 19782
+ 9891 × 30 producing 296730
+ 9891 × 400 what gives us 3956400
+ 9891 × 8000 resulting in 79128000

= 83400912
