Alright, let's solve this math problem step by step. First, we have the number 102. 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 102 and add it to itself 25 times.
Step 1: 0 + 102 = 102
Step 2: 102 + 102 = 204
Step 3: 204 + 102 = 306
Step 4: 306 + 102 = 408
Step 5: 408 + 102 = 510
Step 6: 510 + 102 = 612
Step 7: 612 + 102 = 714
Step 8: 714 + 102 = 816
Step 9: 816 + 102 = 918
Step 10: 918 + 102 = 1020
Step 11: 1020 + 102 = 1122
Step 12: 1122 + 102 = 1224
Step 13: 1224 + 102 = 1326
Step 14: 1326 + 102 = 1428
Step 15: 1428 + 102 = 1530
Step 16: 1530 + 102 = 1632
Step 17: 1632 + 102 = 1734
Step 18: 1734 + 102 = 1836
Step 19: 1836 + 102 = 1938
Step 20: 1938 + 102 = 2040
Step 21: 2040 + 102 = 2142
Step 22: 2142 + 102 = 2244
Step 23: 2244 + 102 = 2346
Step 24: 2346 + 102 = 2448
Step 25: 2448 + 102 = 2550

So, 102*25 = 2550