Alright, let's work through 3105 times 2515 step by step
3105 × 2515 = 2515 × (3105)
+ 2515 × 5 that equals 12575
+ 2515 × 00 what gives us 0
+ 2515 × 100 yielding 251500
+ 2515 × 3000 what gives us 7545000

= 7809075
