Sure thing, let's get straight to it. We start with 813 and we're going to multiply it by 203, which means adding 813 to itself 203 times.
Step 1: 0 + 813 = 813
Step 2: 813 + 813 = 1626
Step 3: 1626 + 813 = 2439
Step 4: 2439 + 813 = 3252
Step 5: 3252 + 813 = 4065
Step 6: 4065 + 813 = 4878
Step 7: 4878 + 813 = 5691
Step 8: 5691 + 813 = 6504
Step 9: 6504 + 813 = 7317
Step 10: 7317 + 813 = 8130
Step 11: 8130 + 813 = 8943
Step 12: 8943 + 813 = 9756
Step 13: 9756 + 813 = 10569
Step 14: 10569 + 813 = 11382
Step 15: 11382 + 813 = 12195
Step 16: 12195 + 813 = 13008
Step 17: 13008 + 813 = 13821
Step 18: 13821 + 813 = 14634
Step 19: 14634 + 813 = 15447
Step 20: 15447 + 813 = 16260
Step 21: 16260 + 813 = 17073
Step 22: 17073 + 813 = 17886
Step 23: 17886 + 813 = 18699
Step 24: 18699 + 813 = 19512
Step 25: 19512 + 813 = 20325
Step 26: 20325 + 813 = 21138
Step 27: 21138 + 813 = 21951
Step 28: 21951 + 813 = 22764
Step 29: 22764 + 813 = 23577
Step 30: 23577 + 813 = 24390
Step 31: 24390 + 813 = 25203
Step 32: 25203 + 813 = 26016
Step 33: 26016 + 813 = 26829
Step 34: 26829 + 813 = 27642
Step 35: 27642 + 813 = 28455
Step 36: 28455 + 813 = 29268
Step 37: 29268 + 813 = 30081
Step 38: 30081 + 813 = 30894
Step 39: 30894 + 813 = 31707
Step 40: 31707 + 813 = 32520
Step 41: 32520 + 813 = 33333
Step 42: 33333 + 813 = 34146
Step 43: 34146 + 813 = 34959
Step 44: 34959 + 813 = 35772
Step 45: 35772 + 813 = 36585
Step 46: 36585 + 813 = 37398
Step 47: 37398 + 813 = 38211
Step 48: 38211 + 813 = 39024
Step 49: 39024 + 813 = 39837
Step 50: 39837 + 813 = 40650
Step 51: 40650 + 813 = 41463
Step 52: 41463 + 813 = 42276
Step 53: 42276 + 813 = 43089
Step 54: 43089 + 813 = 43902
Step 55: 43902 + 813 = 44715
Step 56: 44715 + 813 = 45528
Step 57: 45528 + 813 = 46341
Step 58: 46341 + 813 = 47154
Step 59: 47154 + 813 = 47967
Step 60: 47967 + 813 = 48780
Step 61: 48780 + 813 = 49593
Step 62: 49593 + 813 = 50406
Step 63: 50406 + 813 = 51219
Step 64: 51219 + 813 = 52032
Step 65: 52032 + 813 = 52845
Step 66: 52845 + 813 = 53658
Step 67: 53658 + 813 = 54471
Step 68: 54471 + 813 = 55284
Step 69: 55284 + 813 = 56097
Step 70: 56097 + 813 = 56910
Step 71: 56910 + 813 = 57723
Step 72: 57723 + 813 = 58536
Step 73: 58536 + 813 = 59349
Step 74: 59349 + 813 = 60162
Step 75: 60162 + 813 = 60975
Step 76: 60975 + 813 = 61788
Step 77: 61788 + 813 = 62601
Step 78: 62601 + 813 = 63414
Step 79: 63414 + 813 = 64227
Step 80: 64227 + 813 = 65040
Step 81: 65040 + 813 = 65853
Step 82: 65853 + 813 = 66666
Step 83: 66666 + 813 = 67479
Step 84: 67479 + 813 = 68292
Step 85: 68292 + 813 = 69105
Step 86: 69105 + 813 = 69918
Step 87: 69918 + 813 = 70731
Step 88: 70731 + 813 = 71544
Step 89: 71544 + 813 = 72357
Step 90: 72357 + 813 = 73170
Step 91: 73170 + 813 = 73983
Step 92: 73983 + 813 = 74796
Step 93: 74796 + 813 = 75609
Step 94: 75609 + 813 = 76422
Step 95: 76422 + 813 = 77235
Step 96: 77235 + 813 = 78048
Step 97: 78048 + 813 = 78861
Step 98: 78861 + 813 = 79674
Step 99: 79674 + 813 = 80487
Step 100: 80487 + 813 = 81300
Step 101: 81300 + 813 = 82113
Step 102: 82113 + 813 = 82926
Step 103: 82926 + 813 = 83739
Step 104: 83739 + 813 = 84552
Step 105: 84552 + 813 = 85365
Step 106: 85365 + 813 = 86178
Step 107: 86178 + 813 = 86991
Step 108: 86991 + 813 = 87804
Step 109: 87804 + 813 = 88617
Step 110: 88617 + 813 = 89430
Step 111: 89430 + 813 = 90243
Step 112: 90243 + 813 = 91056
Step 113: 91056 + 813 = 91869
Step 114: 91869 + 813 = 92682
Step 115: 92682 + 813 = 93495
Step 116: 93495 + 813 = 94308
Step 117: 94308 + 813 = 95121
Step 118: 95121 + 813 = 95934
Step 119: 95934 + 813 = 96747
Step 120: 96747 + 813 = 97560
Step 121: 97560 + 813 = 98373
Step 122: 98373 + 813 = 99186
Step 123: 99186 + 813 = 99999
Step 124: 99999 + 813 = 100812
Step 125: 100812 + 813 = 101625
Step 126: 101625 + 813 = 102438
Step 127: 102438 + 813 = 103251
Step 128: 103251 + 813 = 104064
Step 129: 104064 + 813 = 104877
Step 130: 104877 + 813 = 105690
Step 131: 105690 + 813 = 106503
Step 132: 106503 + 813 = 107316
Step 133: 107316 + 813 = 108129
Step 134: 108129 + 813 = 108942
Step 135: 108942 + 813 = 109755
Step 136: 109755 + 813 = 110568
Step 137: 110568 + 813 = 111381
Step 138: 111381 + 813 = 112194
Step 139: 112194 + 813 = 113007
Step 140: 113007 + 813 = 113820
Step 141: 113820 + 813 = 114633
Step 142: 114633 + 813 = 115446
Step 143: 115446 + 813 = 116259
Step 144: 116259 + 813 = 117072
Step 145: 117072 + 813 = 117885
Step 146: 117885 + 813 = 118698
Step 147: 118698 + 813 = 119511
Step 148: 119511 + 813 = 120324
Step 149: 120324 + 813 = 121137
Step 150: 121137 + 813 = 121950
Step 151: 121950 + 813 = 122763
Step 152: 122763 + 813 = 123576
Step 153: 123576 + 813 = 124389
Step 154: 124389 + 813 = 125202
Step 155: 125202 + 813 = 126015
Step 156: 126015 + 813 = 126828
Step 157: 126828 + 813 = 127641
Step 158: 127641 + 813 = 128454
Step 159: 128454 + 813 = 129267
Step 160: 129267 + 813 = 130080
Step 161: 130080 + 813 = 130893
Step 162: 130893 + 813 = 131706
Step 163: 131706 + 813 = 132519
Step 164: 132519 + 813 = 133332
Step 165: 133332 + 813 = 134145
Step 166: 134145 + 813 = 134958
Step 167: 134958 + 813 = 135771
Step 168: 135771 + 813 = 136584
Step 169: 136584 + 813 = 137397
Step 170: 137397 + 813 = 138210
Step 171: 138210 + 813 = 139023
Step 172: 139023 + 813 = 139836
Step 173: 139836 + 813 = 140649
Step 174: 140649 + 813 = 141462
Step 175: 141462 + 813 = 142275
Step 176: 142275 + 813 = 143088
Step 177: 143088 + 813 = 143901
Step 178: 143901 + 813 = 144714
Step 179: 144714 + 813 = 145527
Step 180: 145527 + 813 = 146340
Step 181: 146340 + 813 = 147153
Step 182: 147153 + 813 = 147966
Step 183: 147966 + 813 = 148779
Step 184: 148779 + 813 = 149592
Step 185: 149592 + 813 = 150405
Step 186: 150405 + 813 = 151218
Step 187: 151218 + 813 = 152031
Step 188: 152031 + 813 = 152844
Step 189: 152844 + 813 = 153657
Step 190: 153657 + 813 = 154470
Step 191: 154470 + 813 = 155283
Step 192: 155283 + 813 = 156096
Step 193: 156096 + 813 = 156909
Step 194: 156909 + 813 = 157722
Step 195: 157722 + 813 = 158535
Step 196: 158535 + 813 = 159348
Step 197: 159348 + 813 = 160161
Step 198: 160161 + 813 = 160974
Step 199: 160974 + 813 = 161787
Step 200: 161787 + 813 = 162600
Step 201: 162600 + 813 = 163413
Step 202: 163413 + 813 = 164226
Step 203: 164226 + 813 = 165039

So, 813*203 = 165039