Alright, let's work through 8403 times 502 step by step
8403 × 502 = 502 × (8403)
+ 502 × 3 giving us 1506
+ 502 × 00 that is equal 0
+ 502 × 400 yielding 200800
+ 502 × 8000 which equals 4016000

= 4218306
