Alright, let's work through 2800 times 5509 step by step
2800 × 5509 = 5509 × (2800)
+ 5509 × 0 that is equal 0
+ 5509 × 00 that equals 0
+ 5509 × 800 yielding 4407200
+ 5509 × 2000 that equals 11018000

= 15425200
