Alright, let's solve this math problem step by step. First, we have the number 510. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 25. So, we're going to take the number 510 and add it to itself 25 times.
Step 1: 0 + 510 = 510
Step 2: 510 + 510 = 1020
Step 3: 1020 + 510 = 1530
Step 4: 1530 + 510 = 2040
Step 5: 2040 + 510 = 2550
Step 6: 2550 + 510 = 3060
Step 7: 3060 + 510 = 3570
Step 8: 3570 + 510 = 4080
Step 9: 4080 + 510 = 4590
Step 10: 4590 + 510 = 5100
Step 11: 5100 + 510 = 5610
Step 12: 5610 + 510 = 6120
Step 13: 6120 + 510 = 6630
Step 14: 6630 + 510 = 7140
Step 15: 7140 + 510 = 7650
Step 16: 7650 + 510 = 8160
Step 17: 8160 + 510 = 8670
Step 18: 8670 + 510 = 9180
Step 19: 9180 + 510 = 9690
Step 20: 9690 + 510 = 10200
Step 21: 10200 + 510 = 10710
Step 22: 10710 + 510 = 11220
Step 23: 11220 + 510 = 11730
Step 24: 11730 + 510 = 12240
Step 25: 12240 + 510 = 12750

So, 510*25 = 12750