Alright, let's solve this math problem step by step. First, we have the number 810. 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 810 and add it to itself 73 times.
Step 1: 0 + 810 = 810
Step 2: 810 + 810 = 1620
Step 3: 1620 + 810 = 2430
Step 4: 2430 + 810 = 3240
Step 5: 3240 + 810 = 4050
Step 6: 4050 + 810 = 4860
Step 7: 4860 + 810 = 5670
Step 8: 5670 + 810 = 6480
Step 9: 6480 + 810 = 7290
Step 10: 7290 + 810 = 8100
Step 11: 8100 + 810 = 8910
Step 12: 8910 + 810 = 9720
Step 13: 9720 + 810 = 10530
Step 14: 10530 + 810 = 11340
Step 15: 11340 + 810 = 12150
Step 16: 12150 + 810 = 12960
Step 17: 12960 + 810 = 13770
Step 18: 13770 + 810 = 14580
Step 19: 14580 + 810 = 15390
Step 20: 15390 + 810 = 16200
Step 21: 16200 + 810 = 17010
Step 22: 17010 + 810 = 17820
Step 23: 17820 + 810 = 18630
Step 24: 18630 + 810 = 19440
Step 25: 19440 + 810 = 20250
Step 26: 20250 + 810 = 21060
Step 27: 21060 + 810 = 21870
Step 28: 21870 + 810 = 22680
Step 29: 22680 + 810 = 23490
Step 30: 23490 + 810 = 24300
Step 31: 24300 + 810 = 25110
Step 32: 25110 + 810 = 25920
Step 33: 25920 + 810 = 26730
Step 34: 26730 + 810 = 27540
Step 35: 27540 + 810 = 28350
Step 36: 28350 + 810 = 29160
Step 37: 29160 + 810 = 29970
Step 38: 29970 + 810 = 30780
Step 39: 30780 + 810 = 31590
Step 40: 31590 + 810 = 32400
Step 41: 32400 + 810 = 33210
Step 42: 33210 + 810 = 34020
Step 43: 34020 + 810 = 34830
Step 44: 34830 + 810 = 35640
Step 45: 35640 + 810 = 36450
Step 46: 36450 + 810 = 37260
Step 47: 37260 + 810 = 38070
Step 48: 38070 + 810 = 38880
Step 49: 38880 + 810 = 39690
Step 50: 39690 + 810 = 40500
Step 51: 40500 + 810 = 41310
Step 52: 41310 + 810 = 42120
Step 53: 42120 + 810 = 42930
Step 54: 42930 + 810 = 43740
Step 55: 43740 + 810 = 44550
Step 56: 44550 + 810 = 45360
Step 57: 45360 + 810 = 46170
Step 58: 46170 + 810 = 46980
Step 59: 46980 + 810 = 47790
Step 60: 47790 + 810 = 48600
Step 61: 48600 + 810 = 49410
Step 62: 49410 + 810 = 50220
Step 63: 50220 + 810 = 51030
Step 64: 51030 + 810 = 51840
Step 65: 51840 + 810 = 52650
Step 66: 52650 + 810 = 53460
Step 67: 53460 + 810 = 54270
Step 68: 54270 + 810 = 55080
Step 69: 55080 + 810 = 55890
Step 70: 55890 + 810 = 56700
Step 71: 56700 + 810 = 57510
Step 72: 57510 + 810 = 58320
Step 73: 58320 + 810 = 59130

So, 810*73 = 59130