Alright, let's work through 8128 times 643 step by step
8128 × 643 = 643 × (8128)
+ 643 × 8 producing 5144
+ 643 × 20 that results in 12860
+ 643 × 100 that equals 64300
+ 643 × 8000 giving us 5144000

= 5226304
