Alright, let's work through 7643 times 2003 step by step
7643 × 2003 = 2003 × (7643)
+ 2003 × 3 yielding 6009
+ 2003 × 40 that is equal 80120
+ 2003 × 600 that results in 1201800
+ 2003 × 7000 what gives us 14021000

= 15308929
