Let's get this math done. We have 181 and we're going to multiply it by 111. This is the same as taking 181 and adding it to itself 111 times.
Step 1: 0 + 181 = 181
Step 2: 181 + 181 = 362
Step 3: 362 + 181 = 543
Step 4: 543 + 181 = 724
Step 5: 724 + 181 = 905
Step 6: 905 + 181 = 1086
Step 7: 1086 + 181 = 1267
Step 8: 1267 + 181 = 1448
Step 9: 1448 + 181 = 1629
Step 10: 1629 + 181 = 1810
Step 11: 1810 + 181 = 1991
Step 12: 1991 + 181 = 2172
Step 13: 2172 + 181 = 2353
Step 14: 2353 + 181 = 2534
Step 15: 2534 + 181 = 2715
Step 16: 2715 + 181 = 2896
Step 17: 2896 + 181 = 3077
Step 18: 3077 + 181 = 3258
Step 19: 3258 + 181 = 3439
Step 20: 3439 + 181 = 3620
Step 21: 3620 + 181 = 3801
Step 22: 3801 + 181 = 3982
Step 23: 3982 + 181 = 4163
Step 24: 4163 + 181 = 4344
Step 25: 4344 + 181 = 4525
Step 26: 4525 + 181 = 4706
Step 27: 4706 + 181 = 4887
Step 28: 4887 + 181 = 5068
Step 29: 5068 + 181 = 5249
Step 30: 5249 + 181 = 5430
Step 31: 5430 + 181 = 5611
Step 32: 5611 + 181 = 5792
Step 33: 5792 + 181 = 5973
Step 34: 5973 + 181 = 6154
Step 35: 6154 + 181 = 6335
Step 36: 6335 + 181 = 6516
Step 37: 6516 + 181 = 6697
Step 38: 6697 + 181 = 6878
Step 39: 6878 + 181 = 7059
Step 40: 7059 + 181 = 7240
Step 41: 7240 + 181 = 7421
Step 42: 7421 + 181 = 7602
Step 43: 7602 + 181 = 7783
Step 44: 7783 + 181 = 7964
Step 45: 7964 + 181 = 8145
Step 46: 8145 + 181 = 8326
Step 47: 8326 + 181 = 8507
Step 48: 8507 + 181 = 8688
Step 49: 8688 + 181 = 8869
Step 50: 8869 + 181 = 9050
Step 51: 9050 + 181 = 9231
Step 52: 9231 + 181 = 9412
Step 53: 9412 + 181 = 9593
Step 54: 9593 + 181 = 9774
Step 55: 9774 + 181 = 9955
Step 56: 9955 + 181 = 10136
Step 57: 10136 + 181 = 10317
Step 58: 10317 + 181 = 10498
Step 59: 10498 + 181 = 10679
Step 60: 10679 + 181 = 10860
Step 61: 10860 + 181 = 11041
Step 62: 11041 + 181 = 11222
Step 63: 11222 + 181 = 11403
Step 64: 11403 + 181 = 11584
Step 65: 11584 + 181 = 11765
Step 66: 11765 + 181 = 11946
Step 67: 11946 + 181 = 12127
Step 68: 12127 + 181 = 12308
Step 69: 12308 + 181 = 12489
Step 70: 12489 + 181 = 12670
Step 71: 12670 + 181 = 12851
Step 72: 12851 + 181 = 13032
Step 73: 13032 + 181 = 13213
Step 74: 13213 + 181 = 13394
Step 75: 13394 + 181 = 13575
Step 76: 13575 + 181 = 13756
Step 77: 13756 + 181 = 13937
Step 78: 13937 + 181 = 14118
Step 79: 14118 + 181 = 14299
Step 80: 14299 + 181 = 14480
Step 81: 14480 + 181 = 14661
Step 82: 14661 + 181 = 14842
Step 83: 14842 + 181 = 15023
Step 84: 15023 + 181 = 15204
Step 85: 15204 + 181 = 15385
Step 86: 15385 + 181 = 15566
Step 87: 15566 + 181 = 15747
Step 88: 15747 + 181 = 15928
Step 89: 15928 + 181 = 16109
Step 90: 16109 + 181 = 16290
Step 91: 16290 + 181 = 16471
Step 92: 16471 + 181 = 16652
Step 93: 16652 + 181 = 16833
Step 94: 16833 + 181 = 17014
Step 95: 17014 + 181 = 17195
Step 96: 17195 + 181 = 17376
Step 97: 17376 + 181 = 17557
Step 98: 17557 + 181 = 17738
Step 99: 17738 + 181 = 17919
Step 100: 17919 + 181 = 18100
Step 101: 18100 + 181 = 18281
Step 102: 18281 + 181 = 18462
Step 103: 18462 + 181 = 18643
Step 104: 18643 + 181 = 18824
Step 105: 18824 + 181 = 19005
Step 106: 19005 + 181 = 19186
Step 107: 19186 + 181 = 19367
Step 108: 19367 + 181 = 19548
Step 109: 19548 + 181 = 19729
Step 110: 19729 + 181 = 19910
Step 111: 19910 + 181 = 20091

So, 181*111 = 20091