OK, let's crack this. We're given 553 and our task is to multiply it by 155. Essentially, we'll be adding 553 to itself 155 times.
Step 1: 0 + 553 = 553
Step 2: 553 + 553 = 1106
Step 3: 1106 + 553 = 1659
Step 4: 1659 + 553 = 2212
Step 5: 2212 + 553 = 2765
Step 6: 2765 + 553 = 3318
Step 7: 3318 + 553 = 3871
Step 8: 3871 + 553 = 4424
Step 9: 4424 + 553 = 4977
Step 10: 4977 + 553 = 5530
Step 11: 5530 + 553 = 6083
Step 12: 6083 + 553 = 6636
Step 13: 6636 + 553 = 7189
Step 14: 7189 + 553 = 7742
Step 15: 7742 + 553 = 8295
Step 16: 8295 + 553 = 8848
Step 17: 8848 + 553 = 9401
Step 18: 9401 + 553 = 9954
Step 19: 9954 + 553 = 10507
Step 20: 10507 + 553 = 11060
Step 21: 11060 + 553 = 11613
Step 22: 11613 + 553 = 12166
Step 23: 12166 + 553 = 12719
Step 24: 12719 + 553 = 13272
Step 25: 13272 + 553 = 13825
Step 26: 13825 + 553 = 14378
Step 27: 14378 + 553 = 14931
Step 28: 14931 + 553 = 15484
Step 29: 15484 + 553 = 16037
Step 30: 16037 + 553 = 16590
Step 31: 16590 + 553 = 17143
Step 32: 17143 + 553 = 17696
Step 33: 17696 + 553 = 18249
Step 34: 18249 + 553 = 18802
Step 35: 18802 + 553 = 19355
Step 36: 19355 + 553 = 19908
Step 37: 19908 + 553 = 20461
Step 38: 20461 + 553 = 21014
Step 39: 21014 + 553 = 21567
Step 40: 21567 + 553 = 22120
Step 41: 22120 + 553 = 22673
Step 42: 22673 + 553 = 23226
Step 43: 23226 + 553 = 23779
Step 44: 23779 + 553 = 24332
Step 45: 24332 + 553 = 24885
Step 46: 24885 + 553 = 25438
Step 47: 25438 + 553 = 25991
Step 48: 25991 + 553 = 26544
Step 49: 26544 + 553 = 27097
Step 50: 27097 + 553 = 27650
Step 51: 27650 + 553 = 28203
Step 52: 28203 + 553 = 28756
Step 53: 28756 + 553 = 29309
Step 54: 29309 + 553 = 29862
Step 55: 29862 + 553 = 30415
Step 56: 30415 + 553 = 30968
Step 57: 30968 + 553 = 31521
Step 58: 31521 + 553 = 32074
Step 59: 32074 + 553 = 32627
Step 60: 32627 + 553 = 33180
Step 61: 33180 + 553 = 33733
Step 62: 33733 + 553 = 34286
Step 63: 34286 + 553 = 34839
Step 64: 34839 + 553 = 35392
Step 65: 35392 + 553 = 35945
Step 66: 35945 + 553 = 36498
Step 67: 36498 + 553 = 37051
Step 68: 37051 + 553 = 37604
Step 69: 37604 + 553 = 38157
Step 70: 38157 + 553 = 38710
Step 71: 38710 + 553 = 39263
Step 72: 39263 + 553 = 39816
Step 73: 39816 + 553 = 40369
Step 74: 40369 + 553 = 40922
Step 75: 40922 + 553 = 41475
Step 76: 41475 + 553 = 42028
Step 77: 42028 + 553 = 42581
Step 78: 42581 + 553 = 43134
Step 79: 43134 + 553 = 43687
Step 80: 43687 + 553 = 44240
Step 81: 44240 + 553 = 44793
Step 82: 44793 + 553 = 45346
Step 83: 45346 + 553 = 45899
Step 84: 45899 + 553 = 46452
Step 85: 46452 + 553 = 47005
Step 86: 47005 + 553 = 47558
Step 87: 47558 + 553 = 48111
Step 88: 48111 + 553 = 48664
Step 89: 48664 + 553 = 49217
Step 90: 49217 + 553 = 49770
Step 91: 49770 + 553 = 50323
Step 92: 50323 + 553 = 50876
Step 93: 50876 + 553 = 51429
Step 94: 51429 + 553 = 51982
Step 95: 51982 + 553 = 52535
Step 96: 52535 + 553 = 53088
Step 97: 53088 + 553 = 53641
Step 98: 53641 + 553 = 54194
Step 99: 54194 + 553 = 54747
Step 100: 54747 + 553 = 55300
Step 101: 55300 + 553 = 55853
Step 102: 55853 + 553 = 56406
Step 103: 56406 + 553 = 56959
Step 104: 56959 + 553 = 57512
Step 105: 57512 + 553 = 58065
Step 106: 58065 + 553 = 58618
Step 107: 58618 + 553 = 59171
Step 108: 59171 + 553 = 59724
Step 109: 59724 + 553 = 60277
Step 110: 60277 + 553 = 60830
Step 111: 60830 + 553 = 61383
Step 112: 61383 + 553 = 61936
Step 113: 61936 + 553 = 62489
Step 114: 62489 + 553 = 63042
Step 115: 63042 + 553 = 63595
Step 116: 63595 + 553 = 64148
Step 117: 64148 + 553 = 64701
Step 118: 64701 + 553 = 65254
Step 119: 65254 + 553 = 65807
Step 120: 65807 + 553 = 66360
Step 121: 66360 + 553 = 66913
Step 122: 66913 + 553 = 67466
Step 123: 67466 + 553 = 68019
Step 124: 68019 + 553 = 68572
Step 125: 68572 + 553 = 69125
Step 126: 69125 + 553 = 69678
Step 127: 69678 + 553 = 70231
Step 128: 70231 + 553 = 70784
Step 129: 70784 + 553 = 71337
Step 130: 71337 + 553 = 71890
Step 131: 71890 + 553 = 72443
Step 132: 72443 + 553 = 72996
Step 133: 72996 + 553 = 73549
Step 134: 73549 + 553 = 74102
Step 135: 74102 + 553 = 74655
Step 136: 74655 + 553 = 75208
Step 137: 75208 + 553 = 75761
Step 138: 75761 + 553 = 76314
Step 139: 76314 + 553 = 76867
Step 140: 76867 + 553 = 77420
Step 141: 77420 + 553 = 77973
Step 142: 77973 + 553 = 78526
Step 143: 78526 + 553 = 79079
Step 144: 79079 + 553 = 79632
Step 145: 79632 + 553 = 80185
Step 146: 80185 + 553 = 80738
Step 147: 80738 + 553 = 81291
Step 148: 81291 + 553 = 81844
Step 149: 81844 + 553 = 82397
Step 150: 82397 + 553 = 82950
Step 151: 82950 + 553 = 83503
Step 152: 83503 + 553 = 84056
Step 153: 84056 + 553 = 84609
Step 154: 84609 + 553 = 85162
Step 155: 85162 + 553 = 85715

So, 553*155 = 85715