Alright, let's solve this math problem step by step. First, we have the number 104. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 13. So, we're going to take the number 104 and add it to itself 13 times.
Step 1: 0 + 104 = 104
Step 2: 104 + 104 = 208
Step 3: 208 + 104 = 312
Step 4: 312 + 104 = 416
Step 5: 416 + 104 = 520
Step 6: 520 + 104 = 624
Step 7: 624 + 104 = 728
Step 8: 728 + 104 = 832
Step 9: 832 + 104 = 936
Step 10: 936 + 104 = 1040
Step 11: 1040 + 104 = 1144
Step 12: 1144 + 104 = 1248
Step 13: 1248 + 104 = 1352

So, 104*13 = 1352