Alright, let's solve this math problem step by step. First, we have the number 604. 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 604 and add it to itself 25 times.
Step 1: 0 + 604 = 604
Step 2: 604 + 604 = 1208
Step 3: 1208 + 604 = 1812
Step 4: 1812 + 604 = 2416
Step 5: 2416 + 604 = 3020
Step 6: 3020 + 604 = 3624
Step 7: 3624 + 604 = 4228
Step 8: 4228 + 604 = 4832
Step 9: 4832 + 604 = 5436
Step 10: 5436 + 604 = 6040
Step 11: 6040 + 604 = 6644
Step 12: 6644 + 604 = 7248
Step 13: 7248 + 604 = 7852
Step 14: 7852 + 604 = 8456
Step 15: 8456 + 604 = 9060
Step 16: 9060 + 604 = 9664
Step 17: 9664 + 604 = 10268
Step 18: 10268 + 604 = 10872
Step 19: 10872 + 604 = 11476
Step 20: 11476 + 604 = 12080
Step 21: 12080 + 604 = 12684
Step 22: 12684 + 604 = 13288
Step 23: 13288 + 604 = 13892
Step 24: 13892 + 604 = 14496
Step 25: 14496 + 604 = 15100

So, 604*25 = 15100