Alright, let's work through 6409 times 8900 step by step
6409 × 8900 = 8900 × (6409)
+ 8900 × 9 producing 80100
+ 8900 × 00 which equals 0
+ 8900 × 400 yielding 3560000
+ 8900 × 6000 producing 53400000

= 57040100
