Alright, let's work through 4103 times 4003 step by step
4103 × 4003 = 4003 × (4103)
+ 4003 × 3 which equals 12009
+ 4003 × 00 which equals 0
+ 4003 × 100 what gives us 400300
+ 4003 × 4000 that results in 16012000

= 16424309
