Alright, let's solve this math problem step by step. First, we have the number 503. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 57. So, we're going to take the number 503 and add it to itself 57 times.
Step 1: 0 + 503 = 503
Step 2: 503 + 503 = 1006
Step 3: 1006 + 503 = 1509
Step 4: 1509 + 503 = 2012
Step 5: 2012 + 503 = 2515
Step 6: 2515 + 503 = 3018
Step 7: 3018 + 503 = 3521
Step 8: 3521 + 503 = 4024
Step 9: 4024 + 503 = 4527
Step 10: 4527 + 503 = 5030
Step 11: 5030 + 503 = 5533
Step 12: 5533 + 503 = 6036
Step 13: 6036 + 503 = 6539
Step 14: 6539 + 503 = 7042
Step 15: 7042 + 503 = 7545
Step 16: 7545 + 503 = 8048
Step 17: 8048 + 503 = 8551
Step 18: 8551 + 503 = 9054
Step 19: 9054 + 503 = 9557
Step 20: 9557 + 503 = 10060
Step 21: 10060 + 503 = 10563
Step 22: 10563 + 503 = 11066
Step 23: 11066 + 503 = 11569
Step 24: 11569 + 503 = 12072
Step 25: 12072 + 503 = 12575
Step 26: 12575 + 503 = 13078
Step 27: 13078 + 503 = 13581
Step 28: 13581 + 503 = 14084
Step 29: 14084 + 503 = 14587
Step 30: 14587 + 503 = 15090
Step 31: 15090 + 503 = 15593
Step 32: 15593 + 503 = 16096
Step 33: 16096 + 503 = 16599
Step 34: 16599 + 503 = 17102
Step 35: 17102 + 503 = 17605
Step 36: 17605 + 503 = 18108
Step 37: 18108 + 503 = 18611
Step 38: 18611 + 503 = 19114
Step 39: 19114 + 503 = 19617
Step 40: 19617 + 503 = 20120
Step 41: 20120 + 503 = 20623
Step 42: 20623 + 503 = 21126
Step 43: 21126 + 503 = 21629
Step 44: 21629 + 503 = 22132
Step 45: 22132 + 503 = 22635
Step 46: 22635 + 503 = 23138
Step 47: 23138 + 503 = 23641
Step 48: 23641 + 503 = 24144
Step 49: 24144 + 503 = 24647
Step 50: 24647 + 503 = 25150
Step 51: 25150 + 503 = 25653
Step 52: 25653 + 503 = 26156
Step 53: 26156 + 503 = 26659
Step 54: 26659 + 503 = 27162
Step 55: 27162 + 503 = 27665
Step 56: 27665 + 503 = 28168
Step 57: 28168 + 503 = 28671

So, 503*57 = 28671