Alright, let's work through 2503 times 7902 step by step
2503 × 7902 = 7902 × (2503)
+ 7902 × 3 that is equal 23706
+ 7902 × 00 yielding 0
+ 7902 × 500 which equals 3951000
+ 7902 × 2000 yielding 15804000

= 19778706
