Alright, let's work through 1809 times 5990 step by step
1809 × 5990 = 5990 × (1809)
+ 5990 × 9 giving us 53910
+ 5990 × 00 that is equal 0
+ 5990 × 800 which equals 4792000
+ 5990 × 1000 producing 5990000

= 10835910
