OK, let's crack this. We're given 117 and our task is to multiply it by 155. Essentially, we'll be adding 117 to itself 155 times.
Step 1: 0 + 117 = 117
Step 2: 117 + 117 = 234
Step 3: 234 + 117 = 351
Step 4: 351 + 117 = 468
Step 5: 468 + 117 = 585
Step 6: 585 + 117 = 702
Step 7: 702 + 117 = 819
Step 8: 819 + 117 = 936
Step 9: 936 + 117 = 1053
Step 10: 1053 + 117 = 1170
Step 11: 1170 + 117 = 1287
Step 12: 1287 + 117 = 1404
Step 13: 1404 + 117 = 1521
Step 14: 1521 + 117 = 1638
Step 15: 1638 + 117 = 1755
Step 16: 1755 + 117 = 1872
Step 17: 1872 + 117 = 1989
Step 18: 1989 + 117 = 2106
Step 19: 2106 + 117 = 2223
Step 20: 2223 + 117 = 2340
Step 21: 2340 + 117 = 2457
Step 22: 2457 + 117 = 2574
Step 23: 2574 + 117 = 2691
Step 24: 2691 + 117 = 2808
Step 25: 2808 + 117 = 2925
Step 26: 2925 + 117 = 3042
Step 27: 3042 + 117 = 3159
Step 28: 3159 + 117 = 3276
Step 29: 3276 + 117 = 3393
Step 30: 3393 + 117 = 3510
Step 31: 3510 + 117 = 3627
Step 32: 3627 + 117 = 3744
Step 33: 3744 + 117 = 3861
Step 34: 3861 + 117 = 3978
Step 35: 3978 + 117 = 4095
Step 36: 4095 + 117 = 4212
Step 37: 4212 + 117 = 4329
Step 38: 4329 + 117 = 4446
Step 39: 4446 + 117 = 4563
Step 40: 4563 + 117 = 4680
Step 41: 4680 + 117 = 4797
Step 42: 4797 + 117 = 4914
Step 43: 4914 + 117 = 5031
Step 44: 5031 + 117 = 5148
Step 45: 5148 + 117 = 5265
Step 46: 5265 + 117 = 5382
Step 47: 5382 + 117 = 5499
Step 48: 5499 + 117 = 5616
Step 49: 5616 + 117 = 5733
Step 50: 5733 + 117 = 5850
Step 51: 5850 + 117 = 5967
Step 52: 5967 + 117 = 6084
Step 53: 6084 + 117 = 6201
Step 54: 6201 + 117 = 6318
Step 55: 6318 + 117 = 6435
Step 56: 6435 + 117 = 6552
Step 57: 6552 + 117 = 6669
Step 58: 6669 + 117 = 6786
Step 59: 6786 + 117 = 6903
Step 60: 6903 + 117 = 7020
Step 61: 7020 + 117 = 7137
Step 62: 7137 + 117 = 7254
Step 63: 7254 + 117 = 7371
Step 64: 7371 + 117 = 7488
Step 65: 7488 + 117 = 7605
Step 66: 7605 + 117 = 7722
Step 67: 7722 + 117 = 7839
Step 68: 7839 + 117 = 7956
Step 69: 7956 + 117 = 8073
Step 70: 8073 + 117 = 8190
Step 71: 8190 + 117 = 8307
Step 72: 8307 + 117 = 8424
Step 73: 8424 + 117 = 8541
Step 74: 8541 + 117 = 8658
Step 75: 8658 + 117 = 8775
Step 76: 8775 + 117 = 8892
Step 77: 8892 + 117 = 9009
Step 78: 9009 + 117 = 9126
Step 79: 9126 + 117 = 9243
Step 80: 9243 + 117 = 9360
Step 81: 9360 + 117 = 9477
Step 82: 9477 + 117 = 9594
Step 83: 9594 + 117 = 9711
Step 84: 9711 + 117 = 9828
Step 85: 9828 + 117 = 9945
Step 86: 9945 + 117 = 10062
Step 87: 10062 + 117 = 10179
Step 88: 10179 + 117 = 10296
Step 89: 10296 + 117 = 10413
Step 90: 10413 + 117 = 10530
Step 91: 10530 + 117 = 10647
Step 92: 10647 + 117 = 10764
Step 93: 10764 + 117 = 10881
Step 94: 10881 + 117 = 10998
Step 95: 10998 + 117 = 11115
Step 96: 11115 + 117 = 11232
Step 97: 11232 + 117 = 11349
Step 98: 11349 + 117 = 11466
Step 99: 11466 + 117 = 11583
Step 100: 11583 + 117 = 11700
Step 101: 11700 + 117 = 11817
Step 102: 11817 + 117 = 11934
Step 103: 11934 + 117 = 12051
Step 104: 12051 + 117 = 12168
Step 105: 12168 + 117 = 12285
Step 106: 12285 + 117 = 12402
Step 107: 12402 + 117 = 12519
Step 108: 12519 + 117 = 12636
Step 109: 12636 + 117 = 12753
Step 110: 12753 + 117 = 12870
Step 111: 12870 + 117 = 12987
Step 112: 12987 + 117 = 13104
Step 113: 13104 + 117 = 13221
Step 114: 13221 + 117 = 13338
Step 115: 13338 + 117 = 13455
Step 116: 13455 + 117 = 13572
Step 117: 13572 + 117 = 13689
Step 118: 13689 + 117 = 13806
Step 119: 13806 + 117 = 13923
Step 120: 13923 + 117 = 14040
Step 121: 14040 + 117 = 14157
Step 122: 14157 + 117 = 14274
Step 123: 14274 + 117 = 14391
Step 124: 14391 + 117 = 14508
Step 125: 14508 + 117 = 14625
Step 126: 14625 + 117 = 14742
Step 127: 14742 + 117 = 14859
Step 128: 14859 + 117 = 14976
Step 129: 14976 + 117 = 15093
Step 130: 15093 + 117 = 15210
Step 131: 15210 + 117 = 15327
Step 132: 15327 + 117 = 15444
Step 133: 15444 + 117 = 15561
Step 134: 15561 + 117 = 15678
Step 135: 15678 + 117 = 15795
Step 136: 15795 + 117 = 15912
Step 137: 15912 + 117 = 16029
Step 138: 16029 + 117 = 16146
Step 139: 16146 + 117 = 16263
Step 140: 16263 + 117 = 16380
Step 141: 16380 + 117 = 16497
Step 142: 16497 + 117 = 16614
Step 143: 16614 + 117 = 16731
Step 144: 16731 + 117 = 16848
Step 145: 16848 + 117 = 16965
Step 146: 16965 + 117 = 17082
Step 147: 17082 + 117 = 17199
Step 148: 17199 + 117 = 17316
Step 149: 17316 + 117 = 17433
Step 150: 17433 + 117 = 17550
Step 151: 17550 + 117 = 17667
Step 152: 17667 + 117 = 17784
Step 153: 17784 + 117 = 17901
Step 154: 17901 + 117 = 18018
Step 155: 18018 + 117 = 18135

So, 117*155 = 18135