Alright, let's solve this math problem step by step. First, we have the number 409. 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 409 and add it to itself 45 times.
Step 1: 0 + 409 = 409
Step 2: 409 + 409 = 818
Step 3: 818 + 409 = 1227
Step 4: 1227 + 409 = 1636
Step 5: 1636 + 409 = 2045
Step 6: 2045 + 409 = 2454
Step 7: 2454 + 409 = 2863
Step 8: 2863 + 409 = 3272
Step 9: 3272 + 409 = 3681
Step 10: 3681 + 409 = 4090
Step 11: 4090 + 409 = 4499
Step 12: 4499 + 409 = 4908
Step 13: 4908 + 409 = 5317
Step 14: 5317 + 409 = 5726
Step 15: 5726 + 409 = 6135
Step 16: 6135 + 409 = 6544
Step 17: 6544 + 409 = 6953
Step 18: 6953 + 409 = 7362
Step 19: 7362 + 409 = 7771
Step 20: 7771 + 409 = 8180
Step 21: 8180 + 409 = 8589
Step 22: 8589 + 409 = 8998
Step 23: 8998 + 409 = 9407
Step 24: 9407 + 409 = 9816
Step 25: 9816 + 409 = 10225
Step 26: 10225 + 409 = 10634
Step 27: 10634 + 409 = 11043
Step 28: 11043 + 409 = 11452
Step 29: 11452 + 409 = 11861
Step 30: 11861 + 409 = 12270
Step 31: 12270 + 409 = 12679
Step 32: 12679 + 409 = 13088
Step 33: 13088 + 409 = 13497
Step 34: 13497 + 409 = 13906
Step 35: 13906 + 409 = 14315
Step 36: 14315 + 409 = 14724
Step 37: 14724 + 409 = 15133
Step 38: 15133 + 409 = 15542
Step 39: 15542 + 409 = 15951
Step 40: 15951 + 409 = 16360
Step 41: 16360 + 409 = 16769
Step 42: 16769 + 409 = 17178
Step 43: 17178 + 409 = 17587
Step 44: 17587 + 409 = 17996
Step 45: 17996 + 409 = 18405

So, 409*45 = 18405