Alright, let's work through 2643 times 6903 step by step
2643 × 6903 = 6903 × (2643)
+ 6903 × 3 giving us 20709
+ 6903 × 40 that results in 276120
+ 6903 × 600 producing 4141800
+ 6903 × 2000 that is equal 13806000

= 18244629
