Alright, let's work through 8438 times 9105 step by step
8438 × 9105 = 9105 × (8438)
+ 9105 × 8 what gives us 72840
+ 9105 × 30 which equals 273150
+ 9105 × 400 giving us 3642000
+ 9105 × 8000 producing 72840000

= 76827990
