Alright, let's solve this math problem step by step. First, we have the number 405. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 73. So, we're going to take the number 405 and add it to itself 73 times.
Step 1: 0 + 405 = 405
Step 2: 405 + 405 = 810
Step 3: 810 + 405 = 1215
Step 4: 1215 + 405 = 1620
Step 5: 1620 + 405 = 2025
Step 6: 2025 + 405 = 2430
Step 7: 2430 + 405 = 2835
Step 8: 2835 + 405 = 3240
Step 9: 3240 + 405 = 3645
Step 10: 3645 + 405 = 4050
Step 11: 4050 + 405 = 4455
Step 12: 4455 + 405 = 4860
Step 13: 4860 + 405 = 5265
Step 14: 5265 + 405 = 5670
Step 15: 5670 + 405 = 6075
Step 16: 6075 + 405 = 6480
Step 17: 6480 + 405 = 6885
Step 18: 6885 + 405 = 7290
Step 19: 7290 + 405 = 7695
Step 20: 7695 + 405 = 8100
Step 21: 8100 + 405 = 8505
Step 22: 8505 + 405 = 8910
Step 23: 8910 + 405 = 9315
Step 24: 9315 + 405 = 9720
Step 25: 9720 + 405 = 10125
Step 26: 10125 + 405 = 10530
Step 27: 10530 + 405 = 10935
Step 28: 10935 + 405 = 11340
Step 29: 11340 + 405 = 11745
Step 30: 11745 + 405 = 12150
Step 31: 12150 + 405 = 12555
Step 32: 12555 + 405 = 12960
Step 33: 12960 + 405 = 13365
Step 34: 13365 + 405 = 13770
Step 35: 13770 + 405 = 14175
Step 36: 14175 + 405 = 14580
Step 37: 14580 + 405 = 14985
Step 38: 14985 + 405 = 15390
Step 39: 15390 + 405 = 15795
Step 40: 15795 + 405 = 16200
Step 41: 16200 + 405 = 16605
Step 42: 16605 + 405 = 17010
Step 43: 17010 + 405 = 17415
Step 44: 17415 + 405 = 17820
Step 45: 17820 + 405 = 18225
Step 46: 18225 + 405 = 18630
Step 47: 18630 + 405 = 19035
Step 48: 19035 + 405 = 19440
Step 49: 19440 + 405 = 19845
Step 50: 19845 + 405 = 20250
Step 51: 20250 + 405 = 20655
Step 52: 20655 + 405 = 21060
Step 53: 21060 + 405 = 21465
Step 54: 21465 + 405 = 21870
Step 55: 21870 + 405 = 22275
Step 56: 22275 + 405 = 22680
Step 57: 22680 + 405 = 23085
Step 58: 23085 + 405 = 23490
Step 59: 23490 + 405 = 23895
Step 60: 23895 + 405 = 24300
Step 61: 24300 + 405 = 24705
Step 62: 24705 + 405 = 25110
Step 63: 25110 + 405 = 25515
Step 64: 25515 + 405 = 25920
Step 65: 25920 + 405 = 26325
Step 66: 26325 + 405 = 26730
Step 67: 26730 + 405 = 27135
Step 68: 27135 + 405 = 27540
Step 69: 27540 + 405 = 27945
Step 70: 27945 + 405 = 28350
Step 71: 28350 + 405 = 28755
Step 72: 28755 + 405 = 29160
Step 73: 29160 + 405 = 29565

So, 405*73 = 29565