Let's roll up our sleeves and solve this. We have 945 and we're going to multiply it by 181, essentially adding 945 to itself 181 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
Step 82: 76545 + 945 = 77490
Step 83: 77490 + 945 = 78435
Step 84: 78435 + 945 = 79380
Step 85: 79380 + 945 = 80325
Step 86: 80325 + 945 = 81270
Step 87: 81270 + 945 = 82215
Step 88: 82215 + 945 = 83160
Step 89: 83160 + 945 = 84105
Step 90: 84105 + 945 = 85050
Step 91: 85050 + 945 = 85995
Step 92: 85995 + 945 = 86940
Step 93: 86940 + 945 = 87885
Step 94: 87885 + 945 = 88830
Step 95: 88830 + 945 = 89775
Step 96: 89775 + 945 = 90720
Step 97: 90720 + 945 = 91665
Step 98: 91665 + 945 = 92610
Step 99: 92610 + 945 = 93555
Step 100: 93555 + 945 = 94500
Step 101: 94500 + 945 = 95445
Step 102: 95445 + 945 = 96390
Step 103: 96390 + 945 = 97335
Step 104: 97335 + 945 = 98280
Step 105: 98280 + 945 = 99225
Step 106: 99225 + 945 = 100170
Step 107: 100170 + 945 = 101115
Step 108: 101115 + 945 = 102060
Step 109: 102060 + 945 = 103005
Step 110: 103005 + 945 = 103950
Step 111: 103950 + 945 = 104895
Step 112: 104895 + 945 = 105840
Step 113: 105840 + 945 = 106785
Step 114: 106785 + 945 = 107730
Step 115: 107730 + 945 = 108675
Step 116: 108675 + 945 = 109620
Step 117: 109620 + 945 = 110565
Step 118: 110565 + 945 = 111510
Step 119: 111510 + 945 = 112455
Step 120: 112455 + 945 = 113400
Step 121: 113400 + 945 = 114345
Step 122: 114345 + 945 = 115290
Step 123: 115290 + 945 = 116235
Step 124: 116235 + 945 = 117180
Step 125: 117180 + 945 = 118125
Step 126: 118125 + 945 = 119070
Step 127: 119070 + 945 = 120015
Step 128: 120015 + 945 = 120960
Step 129: 120960 + 945 = 121905
Step 130: 121905 + 945 = 122850
Step 131: 122850 + 945 = 123795
Step 132: 123795 + 945 = 124740
Step 133: 124740 + 945 = 125685
Step 134: 125685 + 945 = 126630
Step 135: 126630 + 945 = 127575
Step 136: 127575 + 945 = 128520
Step 137: 128520 + 945 = 129465
Step 138: 129465 + 945 = 130410
Step 139: 130410 + 945 = 131355
Step 140: 131355 + 945 = 132300
Step 141: 132300 + 945 = 133245
Step 142: 133245 + 945 = 134190
Step 143: 134190 + 945 = 135135
Step 144: 135135 + 945 = 136080
Step 145: 136080 + 945 = 137025
Step 146: 137025 + 945 = 137970
Step 147: 137970 + 945 = 138915
Step 148: 138915 + 945 = 139860
Step 149: 139860 + 945 = 140805
Step 150: 140805 + 945 = 141750
Step 151: 141750 + 945 = 142695
Step 152: 142695 + 945 = 143640
Step 153: 143640 + 945 = 144585
Step 154: 144585 + 945 = 145530
Step 155: 145530 + 945 = 146475
Step 156: 146475 + 945 = 147420
Step 157: 147420 + 945 = 148365
Step 158: 148365 + 945 = 149310
Step 159: 149310 + 945 = 150255
Step 160: 150255 + 945 = 151200
Step 161: 151200 + 945 = 152145
Step 162: 152145 + 945 = 153090
Step 163: 153090 + 945 = 154035
Step 164: 154035 + 945 = 154980
Step 165: 154980 + 945 = 155925
Step 166: 155925 + 945 = 156870
Step 167: 156870 + 945 = 157815
Step 168: 157815 + 945 = 158760
Step 169: 158760 + 945 = 159705
Step 170: 159705 + 945 = 160650
Step 171: 160650 + 945 = 161595
Step 172: 161595 + 945 = 162540
Step 173: 162540 + 945 = 163485
Step 174: 163485 + 945 = 164430
Step 175: 164430 + 945 = 165375
Step 176: 165375 + 945 = 166320
Step 177: 166320 + 945 = 167265
Step 178: 167265 + 945 = 168210
Step 179: 168210 + 945 = 169155
Step 180: 169155 + 945 = 170100
Step 181: 170100 + 945 = 171045

So, 945*181 = 171045