OK, let's crack this. We're given 511 and our task is to multiply it by 248. Essentially, we'll be adding 511 to itself 248 times.
Step 1: 0 + 511 = 511
Step 2: 511 + 511 = 1022
Step 3: 1022 + 511 = 1533
Step 4: 1533 + 511 = 2044
Step 5: 2044 + 511 = 2555
Step 6: 2555 + 511 = 3066
Step 7: 3066 + 511 = 3577
Step 8: 3577 + 511 = 4088
Step 9: 4088 + 511 = 4599
Step 10: 4599 + 511 = 5110
Step 11: 5110 + 511 = 5621
Step 12: 5621 + 511 = 6132
Step 13: 6132 + 511 = 6643
Step 14: 6643 + 511 = 7154
Step 15: 7154 + 511 = 7665
Step 16: 7665 + 511 = 8176
Step 17: 8176 + 511 = 8687
Step 18: 8687 + 511 = 9198
Step 19: 9198 + 511 = 9709
Step 20: 9709 + 511 = 10220
Step 21: 10220 + 511 = 10731
Step 22: 10731 + 511 = 11242
Step 23: 11242 + 511 = 11753
Step 24: 11753 + 511 = 12264
Step 25: 12264 + 511 = 12775
Step 26: 12775 + 511 = 13286
Step 27: 13286 + 511 = 13797
Step 28: 13797 + 511 = 14308
Step 29: 14308 + 511 = 14819
Step 30: 14819 + 511 = 15330
Step 31: 15330 + 511 = 15841
Step 32: 15841 + 511 = 16352
Step 33: 16352 + 511 = 16863
Step 34: 16863 + 511 = 17374
Step 35: 17374 + 511 = 17885
Step 36: 17885 + 511 = 18396
Step 37: 18396 + 511 = 18907
Step 38: 18907 + 511 = 19418
Step 39: 19418 + 511 = 19929
Step 40: 19929 + 511 = 20440
Step 41: 20440 + 511 = 20951
Step 42: 20951 + 511 = 21462
Step 43: 21462 + 511 = 21973
Step 44: 21973 + 511 = 22484
Step 45: 22484 + 511 = 22995
Step 46: 22995 + 511 = 23506
Step 47: 23506 + 511 = 24017
Step 48: 24017 + 511 = 24528
Step 49: 24528 + 511 = 25039
Step 50: 25039 + 511 = 25550
Step 51: 25550 + 511 = 26061
Step 52: 26061 + 511 = 26572
Step 53: 26572 + 511 = 27083
Step 54: 27083 + 511 = 27594
Step 55: 27594 + 511 = 28105
Step 56: 28105 + 511 = 28616
Step 57: 28616 + 511 = 29127
Step 58: 29127 + 511 = 29638
Step 59: 29638 + 511 = 30149
Step 60: 30149 + 511 = 30660
Step 61: 30660 + 511 = 31171
Step 62: 31171 + 511 = 31682
Step 63: 31682 + 511 = 32193
Step 64: 32193 + 511 = 32704
Step 65: 32704 + 511 = 33215
Step 66: 33215 + 511 = 33726
Step 67: 33726 + 511 = 34237
Step 68: 34237 + 511 = 34748
Step 69: 34748 + 511 = 35259
Step 70: 35259 + 511 = 35770
Step 71: 35770 + 511 = 36281
Step 72: 36281 + 511 = 36792
Step 73: 36792 + 511 = 37303
Step 74: 37303 + 511 = 37814
Step 75: 37814 + 511 = 38325
Step 76: 38325 + 511 = 38836
Step 77: 38836 + 511 = 39347
Step 78: 39347 + 511 = 39858
Step 79: 39858 + 511 = 40369
Step 80: 40369 + 511 = 40880
Step 81: 40880 + 511 = 41391
Step 82: 41391 + 511 = 41902
Step 83: 41902 + 511 = 42413
Step 84: 42413 + 511 = 42924
Step 85: 42924 + 511 = 43435
Step 86: 43435 + 511 = 43946
Step 87: 43946 + 511 = 44457
Step 88: 44457 + 511 = 44968
Step 89: 44968 + 511 = 45479
Step 90: 45479 + 511 = 45990
Step 91: 45990 + 511 = 46501
Step 92: 46501 + 511 = 47012
Step 93: 47012 + 511 = 47523
Step 94: 47523 + 511 = 48034
Step 95: 48034 + 511 = 48545
Step 96: 48545 + 511 = 49056
Step 97: 49056 + 511 = 49567
Step 98: 49567 + 511 = 50078
Step 99: 50078 + 511 = 50589
Step 100: 50589 + 511 = 51100
Step 101: 51100 + 511 = 51611
Step 102: 51611 + 511 = 52122
Step 103: 52122 + 511 = 52633
Step 104: 52633 + 511 = 53144
Step 105: 53144 + 511 = 53655
Step 106: 53655 + 511 = 54166
Step 107: 54166 + 511 = 54677
Step 108: 54677 + 511 = 55188
Step 109: 55188 + 511 = 55699
Step 110: 55699 + 511 = 56210
Step 111: 56210 + 511 = 56721
Step 112: 56721 + 511 = 57232
Step 113: 57232 + 511 = 57743
Step 114: 57743 + 511 = 58254
Step 115: 58254 + 511 = 58765
Step 116: 58765 + 511 = 59276
Step 117: 59276 + 511 = 59787
Step 118: 59787 + 511 = 60298
Step 119: 60298 + 511 = 60809
Step 120: 60809 + 511 = 61320
Step 121: 61320 + 511 = 61831
Step 122: 61831 + 511 = 62342
Step 123: 62342 + 511 = 62853
Step 124: 62853 + 511 = 63364
Step 125: 63364 + 511 = 63875
Step 126: 63875 + 511 = 64386
Step 127: 64386 + 511 = 64897
Step 128: 64897 + 511 = 65408
Step 129: 65408 + 511 = 65919
Step 130: 65919 + 511 = 66430
Step 131: 66430 + 511 = 66941
Step 132: 66941 + 511 = 67452
Step 133: 67452 + 511 = 67963
Step 134: 67963 + 511 = 68474
Step 135: 68474 + 511 = 68985
Step 136: 68985 + 511 = 69496
Step 137: 69496 + 511 = 70007
Step 138: 70007 + 511 = 70518
Step 139: 70518 + 511 = 71029
Step 140: 71029 + 511 = 71540
Step 141: 71540 + 511 = 72051
Step 142: 72051 + 511 = 72562
Step 143: 72562 + 511 = 73073
Step 144: 73073 + 511 = 73584
Step 145: 73584 + 511 = 74095
Step 146: 74095 + 511 = 74606
Step 147: 74606 + 511 = 75117
Step 148: 75117 + 511 = 75628
Step 149: 75628 + 511 = 76139
Step 150: 76139 + 511 = 76650
Step 151: 76650 + 511 = 77161
Step 152: 77161 + 511 = 77672
Step 153: 77672 + 511 = 78183
Step 154: 78183 + 511 = 78694
Step 155: 78694 + 511 = 79205
Step 156: 79205 + 511 = 79716
Step 157: 79716 + 511 = 80227
Step 158: 80227 + 511 = 80738
Step 159: 80738 + 511 = 81249
Step 160: 81249 + 511 = 81760
Step 161: 81760 + 511 = 82271
Step 162: 82271 + 511 = 82782
Step 163: 82782 + 511 = 83293
Step 164: 83293 + 511 = 83804
Step 165: 83804 + 511 = 84315
Step 166: 84315 + 511 = 84826
Step 167: 84826 + 511 = 85337
Step 168: 85337 + 511 = 85848
Step 169: 85848 + 511 = 86359
Step 170: 86359 + 511 = 86870
Step 171: 86870 + 511 = 87381
Step 172: 87381 + 511 = 87892
Step 173: 87892 + 511 = 88403
Step 174: 88403 + 511 = 88914
Step 175: 88914 + 511 = 89425
Step 176: 89425 + 511 = 89936
Step 177: 89936 + 511 = 90447
Step 178: 90447 + 511 = 90958
Step 179: 90958 + 511 = 91469
Step 180: 91469 + 511 = 91980
Step 181: 91980 + 511 = 92491
Step 182: 92491 + 511 = 93002
Step 183: 93002 + 511 = 93513
Step 184: 93513 + 511 = 94024
Step 185: 94024 + 511 = 94535
Step 186: 94535 + 511 = 95046
Step 187: 95046 + 511 = 95557
Step 188: 95557 + 511 = 96068
Step 189: 96068 + 511 = 96579
Step 190: 96579 + 511 = 97090
Step 191: 97090 + 511 = 97601
Step 192: 97601 + 511 = 98112
Step 193: 98112 + 511 = 98623
Step 194: 98623 + 511 = 99134
Step 195: 99134 + 511 = 99645
Step 196: 99645 + 511 = 100156
Step 197: 100156 + 511 = 100667
Step 198: 100667 + 511 = 101178
Step 199: 101178 + 511 = 101689
Step 200: 101689 + 511 = 102200
Step 201: 102200 + 511 = 102711
Step 202: 102711 + 511 = 103222
Step 203: 103222 + 511 = 103733
Step 204: 103733 + 511 = 104244
Step 205: 104244 + 511 = 104755
Step 206: 104755 + 511 = 105266
Step 207: 105266 + 511 = 105777
Step 208: 105777 + 511 = 106288
Step 209: 106288 + 511 = 106799
Step 210: 106799 + 511 = 107310
Step 211: 107310 + 511 = 107821
Step 212: 107821 + 511 = 108332
Step 213: 108332 + 511 = 108843
Step 214: 108843 + 511 = 109354
Step 215: 109354 + 511 = 109865
Step 216: 109865 + 511 = 110376
Step 217: 110376 + 511 = 110887
Step 218: 110887 + 511 = 111398
Step 219: 111398 + 511 = 111909
Step 220: 111909 + 511 = 112420
Step 221: 112420 + 511 = 112931
Step 222: 112931 + 511 = 113442
Step 223: 113442 + 511 = 113953
Step 224: 113953 + 511 = 114464
Step 225: 114464 + 511 = 114975
Step 226: 114975 + 511 = 115486
Step 227: 115486 + 511 = 115997
Step 228: 115997 + 511 = 116508
Step 229: 116508 + 511 = 117019
Step 230: 117019 + 511 = 117530
Step 231: 117530 + 511 = 118041
Step 232: 118041 + 511 = 118552
Step 233: 118552 + 511 = 119063
Step 234: 119063 + 511 = 119574
Step 235: 119574 + 511 = 120085
Step 236: 120085 + 511 = 120596
Step 237: 120596 + 511 = 121107
Step 238: 121107 + 511 = 121618
Step 239: 121618 + 511 = 122129
Step 240: 122129 + 511 = 122640
Step 241: 122640 + 511 = 123151
Step 242: 123151 + 511 = 123662
Step 243: 123662 + 511 = 124173
Step 244: 124173 + 511 = 124684
Step 245: 124684 + 511 = 125195
Step 246: 125195 + 511 = 125706
Step 247: 125706 + 511 = 126217
Step 248: 126217 + 511 = 126728

So, 511*248 = 126728