Alright, let's work through 3015 times 4142 step by step
3015 × 4142 = 4142 × (3015)
+ 4142 × 5 that equals 20710
+ 4142 × 10 which equals 41420
+ 4142 × 000 giving us 0
+ 4142 × 3000 yielding 12426000

= 12488130
