Alright, let's work through 5203 times 405 step by step
5203 × 405 = 405 × (5203)
+ 405 × 3 that equals 1215
+ 405 × 00 what gives us 0
+ 405 × 200 that is equal 81000
+ 405 × 5000 what gives us 2025000

= 2107215
