Let's roll up our sleeves and solve this. We have 545 and we're going to multiply it by 155, essentially adding 545 to itself 155 times.
Step 1: 0 + 545 = 545
Step 2: 545 + 545 = 1090
Step 3: 1090 + 545 = 1635
Step 4: 1635 + 545 = 2180
Step 5: 2180 + 545 = 2725
Step 6: 2725 + 545 = 3270
Step 7: 3270 + 545 = 3815
Step 8: 3815 + 545 = 4360
Step 9: 4360 + 545 = 4905
Step 10: 4905 + 545 = 5450
Step 11: 5450 + 545 = 5995
Step 12: 5995 + 545 = 6540
Step 13: 6540 + 545 = 7085
Step 14: 7085 + 545 = 7630
Step 15: 7630 + 545 = 8175
Step 16: 8175 + 545 = 8720
Step 17: 8720 + 545 = 9265
Step 18: 9265 + 545 = 9810
Step 19: 9810 + 545 = 10355
Step 20: 10355 + 545 = 10900
Step 21: 10900 + 545 = 11445
Step 22: 11445 + 545 = 11990
Step 23: 11990 + 545 = 12535
Step 24: 12535 + 545 = 13080
Step 25: 13080 + 545 = 13625
Step 26: 13625 + 545 = 14170
Step 27: 14170 + 545 = 14715
Step 28: 14715 + 545 = 15260
Step 29: 15260 + 545 = 15805
Step 30: 15805 + 545 = 16350
Step 31: 16350 + 545 = 16895
Step 32: 16895 + 545 = 17440
Step 33: 17440 + 545 = 17985
Step 34: 17985 + 545 = 18530
Step 35: 18530 + 545 = 19075
Step 36: 19075 + 545 = 19620
Step 37: 19620 + 545 = 20165
Step 38: 20165 + 545 = 20710
Step 39: 20710 + 545 = 21255
Step 40: 21255 + 545 = 21800
Step 41: 21800 + 545 = 22345
Step 42: 22345 + 545 = 22890
Step 43: 22890 + 545 = 23435
Step 44: 23435 + 545 = 23980
Step 45: 23980 + 545 = 24525
Step 46: 24525 + 545 = 25070
Step 47: 25070 + 545 = 25615
Step 48: 25615 + 545 = 26160
Step 49: 26160 + 545 = 26705
Step 50: 26705 + 545 = 27250
Step 51: 27250 + 545 = 27795
Step 52: 27795 + 545 = 28340
Step 53: 28340 + 545 = 28885
Step 54: 28885 + 545 = 29430
Step 55: 29430 + 545 = 29975
Step 56: 29975 + 545 = 30520
Step 57: 30520 + 545 = 31065
Step 58: 31065 + 545 = 31610
Step 59: 31610 + 545 = 32155
Step 60: 32155 + 545 = 32700
Step 61: 32700 + 545 = 33245
Step 62: 33245 + 545 = 33790
Step 63: 33790 + 545 = 34335
Step 64: 34335 + 545 = 34880
Step 65: 34880 + 545 = 35425
Step 66: 35425 + 545 = 35970
Step 67: 35970 + 545 = 36515
Step 68: 36515 + 545 = 37060
Step 69: 37060 + 545 = 37605
Step 70: 37605 + 545 = 38150
Step 71: 38150 + 545 = 38695
Step 72: 38695 + 545 = 39240
Step 73: 39240 + 545 = 39785
Step 74: 39785 + 545 = 40330
Step 75: 40330 + 545 = 40875
Step 76: 40875 + 545 = 41420
Step 77: 41420 + 545 = 41965
Step 78: 41965 + 545 = 42510
Step 79: 42510 + 545 = 43055
Step 80: 43055 + 545 = 43600
Step 81: 43600 + 545 = 44145
Step 82: 44145 + 545 = 44690
Step 83: 44690 + 545 = 45235
Step 84: 45235 + 545 = 45780
Step 85: 45780 + 545 = 46325
Step 86: 46325 + 545 = 46870
Step 87: 46870 + 545 = 47415
Step 88: 47415 + 545 = 47960
Step 89: 47960 + 545 = 48505
Step 90: 48505 + 545 = 49050
Step 91: 49050 + 545 = 49595
Step 92: 49595 + 545 = 50140
Step 93: 50140 + 545 = 50685
Step 94: 50685 + 545 = 51230
Step 95: 51230 + 545 = 51775
Step 96: 51775 + 545 = 52320
Step 97: 52320 + 545 = 52865
Step 98: 52865 + 545 = 53410
Step 99: 53410 + 545 = 53955
Step 100: 53955 + 545 = 54500
Step 101: 54500 + 545 = 55045
Step 102: 55045 + 545 = 55590
Step 103: 55590 + 545 = 56135
Step 104: 56135 + 545 = 56680
Step 105: 56680 + 545 = 57225
Step 106: 57225 + 545 = 57770
Step 107: 57770 + 545 = 58315
Step 108: 58315 + 545 = 58860
Step 109: 58860 + 545 = 59405
Step 110: 59405 + 545 = 59950
Step 111: 59950 + 545 = 60495
Step 112: 60495 + 545 = 61040
Step 113: 61040 + 545 = 61585
Step 114: 61585 + 545 = 62130
Step 115: 62130 + 545 = 62675
Step 116: 62675 + 545 = 63220
Step 117: 63220 + 545 = 63765
Step 118: 63765 + 545 = 64310
Step 119: 64310 + 545 = 64855
Step 120: 64855 + 545 = 65400
Step 121: 65400 + 545 = 65945
Step 122: 65945 + 545 = 66490
Step 123: 66490 + 545 = 67035
Step 124: 67035 + 545 = 67580
Step 125: 67580 + 545 = 68125
Step 126: 68125 + 545 = 68670
Step 127: 68670 + 545 = 69215
Step 128: 69215 + 545 = 69760
Step 129: 69760 + 545 = 70305
Step 130: 70305 + 545 = 70850
Step 131: 70850 + 545 = 71395
Step 132: 71395 + 545 = 71940
Step 133: 71940 + 545 = 72485
Step 134: 72485 + 545 = 73030
Step 135: 73030 + 545 = 73575
Step 136: 73575 + 545 = 74120
Step 137: 74120 + 545 = 74665
Step 138: 74665 + 545 = 75210
Step 139: 75210 + 545 = 75755
Step 140: 75755 + 545 = 76300
Step 141: 76300 + 545 = 76845
Step 142: 76845 + 545 = 77390
Step 143: 77390 + 545 = 77935
Step 144: 77935 + 545 = 78480
Step 145: 78480 + 545 = 79025
Step 146: 79025 + 545 = 79570
Step 147: 79570 + 545 = 80115
Step 148: 80115 + 545 = 80660
Step 149: 80660 + 545 = 81205
Step 150: 81205 + 545 = 81750
Step 151: 81750 + 545 = 82295
Step 152: 82295 + 545 = 82840
Step 153: 82840 + 545 = 83385
Step 154: 83385 + 545 = 83930
Step 155: 83930 + 545 = 84475

So, 545*155 = 84475