Alright, let's solve this math problem step by step. First, we have the number 517. 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 517 and add it to itself 25 times.
Step 1: 0 + 517 = 517
Step 2: 517 + 517 = 1034
Step 3: 1034 + 517 = 1551
Step 4: 1551 + 517 = 2068
Step 5: 2068 + 517 = 2585
Step 6: 2585 + 517 = 3102
Step 7: 3102 + 517 = 3619
Step 8: 3619 + 517 = 4136
Step 9: 4136 + 517 = 4653
Step 10: 4653 + 517 = 5170
Step 11: 5170 + 517 = 5687
Step 12: 5687 + 517 = 6204
Step 13: 6204 + 517 = 6721
Step 14: 6721 + 517 = 7238
Step 15: 7238 + 517 = 7755
Step 16: 7755 + 517 = 8272
Step 17: 8272 + 517 = 8789
Step 18: 8789 + 517 = 9306
Step 19: 9306 + 517 = 9823
Step 20: 9823 + 517 = 10340
Step 21: 10340 + 517 = 10857
Step 22: 10857 + 517 = 11374
Step 23: 11374 + 517 = 11891
Step 24: 11891 + 517 = 12408
Step 25: 12408 + 517 = 12925

So, 517*25 = 12925