Alright, let's work through 9903 times 5203 step by step
9903 × 5203 = 5203 × (9903)
+ 5203 × 3 that equals 15609
+ 5203 × 00 resulting in 0
+ 5203 × 900 yielding 4682700
+ 5203 × 9000 giving us 46827000

= 51525309
