Alright, let's solve this math problem step by step. First, we have the number 945. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 81. So, we're going to take the number 945 and add it to itself 81 times.
Step 1: 0 + 945 = 945
Step 2: 945 + 945 = 1890
Step 3: 1890 + 945 = 2835
Step 4: 2835 + 945 = 3780
Step 5: 3780 + 945 = 4725
Step 6: 4725 + 945 = 5670
Step 7: 5670 + 945 = 6615
Step 8: 6615 + 945 = 7560
Step 9: 7560 + 945 = 8505
Step 10: 8505 + 945 = 9450
Step 11: 9450 + 945 = 10395
Step 12: 10395 + 945 = 11340
Step 13: 11340 + 945 = 12285
Step 14: 12285 + 945 = 13230
Step 15: 13230 + 945 = 14175
Step 16: 14175 + 945 = 15120
Step 17: 15120 + 945 = 16065
Step 18: 16065 + 945 = 17010
Step 19: 17010 + 945 = 17955
Step 20: 17955 + 945 = 18900
Step 21: 18900 + 945 = 19845
Step 22: 19845 + 945 = 20790
Step 23: 20790 + 945 = 21735
Step 24: 21735 + 945 = 22680
Step 25: 22680 + 945 = 23625
Step 26: 23625 + 945 = 24570
Step 27: 24570 + 945 = 25515
Step 28: 25515 + 945 = 26460
Step 29: 26460 + 945 = 27405
Step 30: 27405 + 945 = 28350
Step 31: 28350 + 945 = 29295
Step 32: 29295 + 945 = 30240
Step 33: 30240 + 945 = 31185
Step 34: 31185 + 945 = 32130
Step 35: 32130 + 945 = 33075
Step 36: 33075 + 945 = 34020
Step 37: 34020 + 945 = 34965
Step 38: 34965 + 945 = 35910
Step 39: 35910 + 945 = 36855
Step 40: 36855 + 945 = 37800
Step 41: 37800 + 945 = 38745
Step 42: 38745 + 945 = 39690
Step 43: 39690 + 945 = 40635
Step 44: 40635 + 945 = 41580
Step 45: 41580 + 945 = 42525
Step 46: 42525 + 945 = 43470
Step 47: 43470 + 945 = 44415
Step 48: 44415 + 945 = 45360
Step 49: 45360 + 945 = 46305
Step 50: 46305 + 945 = 47250
Step 51: 47250 + 945 = 48195
Step 52: 48195 + 945 = 49140
Step 53: 49140 + 945 = 50085
Step 54: 50085 + 945 = 51030
Step 55: 51030 + 945 = 51975
Step 56: 51975 + 945 = 52920
Step 57: 52920 + 945 = 53865
Step 58: 53865 + 945 = 54810
Step 59: 54810 + 945 = 55755
Step 60: 55755 + 945 = 56700
Step 61: 56700 + 945 = 57645
Step 62: 57645 + 945 = 58590
Step 63: 58590 + 945 = 59535
Step 64: 59535 + 945 = 60480
Step 65: 60480 + 945 = 61425
Step 66: 61425 + 945 = 62370
Step 67: 62370 + 945 = 63315
Step 68: 63315 + 945 = 64260
Step 69: 64260 + 945 = 65205
Step 70: 65205 + 945 = 66150
Step 71: 66150 + 945 = 67095
Step 72: 67095 + 945 = 68040
Step 73: 68040 + 945 = 68985
Step 74: 68985 + 945 = 69930
Step 75: 69930 + 945 = 70875
Step 76: 70875 + 945 = 71820
Step 77: 71820 + 945 = 72765
Step 78: 72765 + 945 = 73710
Step 79: 73710 + 945 = 74655
Step 80: 74655 + 945 = 75600
Step 81: 75600 + 945 = 76545

So, 945*81 = 76545