Alright, let's work through 8067 times 2644 step by step
8067 × 2644 = 2644 × (8067)
+ 2644 × 7 yielding 18508
+ 2644 × 60 what gives us 158640
+ 2644 × 000 what gives us 0
+ 2644 × 8000 that equals 21152000

= 21329148
