OK, let's work through this together. We're starting with 631 and we're going to multiply it by 203, which means we add 631 to itself 203 times.
Step 1: 0 + 631 = 631
Step 2: 631 + 631 = 1262
Step 3: 1262 + 631 = 1893
Step 4: 1893 + 631 = 2524
Step 5: 2524 + 631 = 3155
Step 6: 3155 + 631 = 3786
Step 7: 3786 + 631 = 4417
Step 8: 4417 + 631 = 5048
Step 9: 5048 + 631 = 5679
Step 10: 5679 + 631 = 6310
Step 11: 6310 + 631 = 6941
Step 12: 6941 + 631 = 7572
Step 13: 7572 + 631 = 8203
Step 14: 8203 + 631 = 8834
Step 15: 8834 + 631 = 9465
Step 16: 9465 + 631 = 10096
Step 17: 10096 + 631 = 10727
Step 18: 10727 + 631 = 11358
Step 19: 11358 + 631 = 11989
Step 20: 11989 + 631 = 12620
Step 21: 12620 + 631 = 13251
Step 22: 13251 + 631 = 13882
Step 23: 13882 + 631 = 14513
Step 24: 14513 + 631 = 15144
Step 25: 15144 + 631 = 15775
Step 26: 15775 + 631 = 16406
Step 27: 16406 + 631 = 17037
Step 28: 17037 + 631 = 17668
Step 29: 17668 + 631 = 18299
Step 30: 18299 + 631 = 18930
Step 31: 18930 + 631 = 19561
Step 32: 19561 + 631 = 20192
Step 33: 20192 + 631 = 20823
Step 34: 20823 + 631 = 21454
Step 35: 21454 + 631 = 22085
Step 36: 22085 + 631 = 22716
Step 37: 22716 + 631 = 23347
Step 38: 23347 + 631 = 23978
Step 39: 23978 + 631 = 24609
Step 40: 24609 + 631 = 25240
Step 41: 25240 + 631 = 25871
Step 42: 25871 + 631 = 26502
Step 43: 26502 + 631 = 27133
Step 44: 27133 + 631 = 27764
Step 45: 27764 + 631 = 28395
Step 46: 28395 + 631 = 29026
Step 47: 29026 + 631 = 29657
Step 48: 29657 + 631 = 30288
Step 49: 30288 + 631 = 30919
Step 50: 30919 + 631 = 31550
Step 51: 31550 + 631 = 32181
Step 52: 32181 + 631 = 32812
Step 53: 32812 + 631 = 33443
Step 54: 33443 + 631 = 34074
Step 55: 34074 + 631 = 34705
Step 56: 34705 + 631 = 35336
Step 57: 35336 + 631 = 35967
Step 58: 35967 + 631 = 36598
Step 59: 36598 + 631 = 37229
Step 60: 37229 + 631 = 37860
Step 61: 37860 + 631 = 38491
Step 62: 38491 + 631 = 39122
Step 63: 39122 + 631 = 39753
Step 64: 39753 + 631 = 40384
Step 65: 40384 + 631 = 41015
Step 66: 41015 + 631 = 41646
Step 67: 41646 + 631 = 42277
Step 68: 42277 + 631 = 42908
Step 69: 42908 + 631 = 43539
Step 70: 43539 + 631 = 44170
Step 71: 44170 + 631 = 44801
Step 72: 44801 + 631 = 45432
Step 73: 45432 + 631 = 46063
Step 74: 46063 + 631 = 46694
Step 75: 46694 + 631 = 47325
Step 76: 47325 + 631 = 47956
Step 77: 47956 + 631 = 48587
Step 78: 48587 + 631 = 49218
Step 79: 49218 + 631 = 49849
Step 80: 49849 + 631 = 50480
Step 81: 50480 + 631 = 51111
Step 82: 51111 + 631 = 51742
Step 83: 51742 + 631 = 52373
Step 84: 52373 + 631 = 53004
Step 85: 53004 + 631 = 53635
Step 86: 53635 + 631 = 54266
Step 87: 54266 + 631 = 54897
Step 88: 54897 + 631 = 55528
Step 89: 55528 + 631 = 56159
Step 90: 56159 + 631 = 56790
Step 91: 56790 + 631 = 57421
Step 92: 57421 + 631 = 58052
Step 93: 58052 + 631 = 58683
Step 94: 58683 + 631 = 59314
Step 95: 59314 + 631 = 59945
Step 96: 59945 + 631 = 60576
Step 97: 60576 + 631 = 61207
Step 98: 61207 + 631 = 61838
Step 99: 61838 + 631 = 62469
Step 100: 62469 + 631 = 63100
Step 101: 63100 + 631 = 63731
Step 102: 63731 + 631 = 64362
Step 103: 64362 + 631 = 64993
Step 104: 64993 + 631 = 65624
Step 105: 65624 + 631 = 66255
Step 106: 66255 + 631 = 66886
Step 107: 66886 + 631 = 67517
Step 108: 67517 + 631 = 68148
Step 109: 68148 + 631 = 68779
Step 110: 68779 + 631 = 69410
Step 111: 69410 + 631 = 70041
Step 112: 70041 + 631 = 70672
Step 113: 70672 + 631 = 71303
Step 114: 71303 + 631 = 71934
Step 115: 71934 + 631 = 72565
Step 116: 72565 + 631 = 73196
Step 117: 73196 + 631 = 73827
Step 118: 73827 + 631 = 74458
Step 119: 74458 + 631 = 75089
Step 120: 75089 + 631 = 75720
Step 121: 75720 + 631 = 76351
Step 122: 76351 + 631 = 76982
Step 123: 76982 + 631 = 77613
Step 124: 77613 + 631 = 78244
Step 125: 78244 + 631 = 78875
Step 126: 78875 + 631 = 79506
Step 127: 79506 + 631 = 80137
Step 128: 80137 + 631 = 80768
Step 129: 80768 + 631 = 81399
Step 130: 81399 + 631 = 82030
Step 131: 82030 + 631 = 82661
Step 132: 82661 + 631 = 83292
Step 133: 83292 + 631 = 83923
Step 134: 83923 + 631 = 84554
Step 135: 84554 + 631 = 85185
Step 136: 85185 + 631 = 85816
Step 137: 85816 + 631 = 86447
Step 138: 86447 + 631 = 87078
Step 139: 87078 + 631 = 87709
Step 140: 87709 + 631 = 88340
Step 141: 88340 + 631 = 88971
Step 142: 88971 + 631 = 89602
Step 143: 89602 + 631 = 90233
Step 144: 90233 + 631 = 90864
Step 145: 90864 + 631 = 91495
Step 146: 91495 + 631 = 92126
Step 147: 92126 + 631 = 92757
Step 148: 92757 + 631 = 93388
Step 149: 93388 + 631 = 94019
Step 150: 94019 + 631 = 94650
Step 151: 94650 + 631 = 95281
Step 152: 95281 + 631 = 95912
Step 153: 95912 + 631 = 96543
Step 154: 96543 + 631 = 97174
Step 155: 97174 + 631 = 97805
Step 156: 97805 + 631 = 98436
Step 157: 98436 + 631 = 99067
Step 158: 99067 + 631 = 99698
Step 159: 99698 + 631 = 100329
Step 160: 100329 + 631 = 100960
Step 161: 100960 + 631 = 101591
Step 162: 101591 + 631 = 102222
Step 163: 102222 + 631 = 102853
Step 164: 102853 + 631 = 103484
Step 165: 103484 + 631 = 104115
Step 166: 104115 + 631 = 104746
Step 167: 104746 + 631 = 105377
Step 168: 105377 + 631 = 106008
Step 169: 106008 + 631 = 106639
Step 170: 106639 + 631 = 107270
Step 171: 107270 + 631 = 107901
Step 172: 107901 + 631 = 108532
Step 173: 108532 + 631 = 109163
Step 174: 109163 + 631 = 109794
Step 175: 109794 + 631 = 110425
Step 176: 110425 + 631 = 111056
Step 177: 111056 + 631 = 111687
Step 178: 111687 + 631 = 112318
Step 179: 112318 + 631 = 112949
Step 180: 112949 + 631 = 113580
Step 181: 113580 + 631 = 114211
Step 182: 114211 + 631 = 114842
Step 183: 114842 + 631 = 115473
Step 184: 115473 + 631 = 116104
Step 185: 116104 + 631 = 116735
Step 186: 116735 + 631 = 117366
Step 187: 117366 + 631 = 117997
Step 188: 117997 + 631 = 118628
Step 189: 118628 + 631 = 119259
Step 190: 119259 + 631 = 119890
Step 191: 119890 + 631 = 120521
Step 192: 120521 + 631 = 121152
Step 193: 121152 + 631 = 121783
Step 194: 121783 + 631 = 122414
Step 195: 122414 + 631 = 123045
Step 196: 123045 + 631 = 123676
Step 197: 123676 + 631 = 124307
Step 198: 124307 + 631 = 124938
Step 199: 124938 + 631 = 125569
Step 200: 125569 + 631 = 126200
Step 201: 126200 + 631 = 126831
Step 202: 126831 + 631 = 127462
Step 203: 127462 + 631 = 128093

So, 631*203 = 128093