Alright, let's solve this math problem step by step. First, we have the number 453. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 45. So, we're going to take the number 453 and add it to itself 45 times.
Step 1: 0 + 453 = 453
Step 2: 453 + 453 = 906
Step 3: 906 + 453 = 1359
Step 4: 1359 + 453 = 1812
Step 5: 1812 + 453 = 2265
Step 6: 2265 + 453 = 2718
Step 7: 2718 + 453 = 3171
Step 8: 3171 + 453 = 3624
Step 9: 3624 + 453 = 4077
Step 10: 4077 + 453 = 4530
Step 11: 4530 + 453 = 4983
Step 12: 4983 + 453 = 5436
Step 13: 5436 + 453 = 5889
Step 14: 5889 + 453 = 6342
Step 15: 6342 + 453 = 6795
Step 16: 6795 + 453 = 7248
Step 17: 7248 + 453 = 7701
Step 18: 7701 + 453 = 8154
Step 19: 8154 + 453 = 8607
Step 20: 8607 + 453 = 9060
Step 21: 9060 + 453 = 9513
Step 22: 9513 + 453 = 9966
Step 23: 9966 + 453 = 10419
Step 24: 10419 + 453 = 10872
Step 25: 10872 + 453 = 11325
Step 26: 11325 + 453 = 11778
Step 27: 11778 + 453 = 12231
Step 28: 12231 + 453 = 12684
Step 29: 12684 + 453 = 13137
Step 30: 13137 + 453 = 13590
Step 31: 13590 + 453 = 14043
Step 32: 14043 + 453 = 14496
Step 33: 14496 + 453 = 14949
Step 34: 14949 + 453 = 15402
Step 35: 15402 + 453 = 15855
Step 36: 15855 + 453 = 16308
Step 37: 16308 + 453 = 16761
Step 38: 16761 + 453 = 17214
Step 39: 17214 + 453 = 17667
Step 40: 17667 + 453 = 18120
Step 41: 18120 + 453 = 18573
Step 42: 18573 + 453 = 19026
Step 43: 19026 + 453 = 19479
Step 44: 19479 + 453 = 19932
Step 45: 19932 + 453 = 20385

So, 453*45 = 20385