Alright, let's solve this math problem step by step. First, we have the number 457. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 39. So, we're going to take the number 457 and add it to itself 39 times.
Step 1: 0 + 457 = 457
Step 2: 457 + 457 = 914
Step 3: 914 + 457 = 1371
Step 4: 1371 + 457 = 1828
Step 5: 1828 + 457 = 2285
Step 6: 2285 + 457 = 2742
Step 7: 2742 + 457 = 3199
Step 8: 3199 + 457 = 3656
Step 9: 3656 + 457 = 4113
Step 10: 4113 + 457 = 4570
Step 11: 4570 + 457 = 5027
Step 12: 5027 + 457 = 5484
Step 13: 5484 + 457 = 5941
Step 14: 5941 + 457 = 6398
Step 15: 6398 + 457 = 6855
Step 16: 6855 + 457 = 7312
Step 17: 7312 + 457 = 7769
Step 18: 7769 + 457 = 8226
Step 19: 8226 + 457 = 8683
Step 20: 8683 + 457 = 9140
Step 21: 9140 + 457 = 9597
Step 22: 9597 + 457 = 10054
Step 23: 10054 + 457 = 10511
Step 24: 10511 + 457 = 10968
Step 25: 10968 + 457 = 11425
Step 26: 11425 + 457 = 11882
Step 27: 11882 + 457 = 12339
Step 28: 12339 + 457 = 12796
Step 29: 12796 + 457 = 13253
Step 30: 13253 + 457 = 13710
Step 31: 13710 + 457 = 14167
Step 32: 14167 + 457 = 14624
Step 33: 14624 + 457 = 15081
Step 34: 15081 + 457 = 15538
Step 35: 15538 + 457 = 15995
Step 36: 15995 + 457 = 16452
Step 37: 16452 + 457 = 16909
Step 38: 16909 + 457 = 17366
Step 39: 17366 + 457 = 17823

So, 457*39 = 17823