Sure thing, let's get straight to it. We start with 255 and we're going to multiply it by 397, which means adding 255 to itself 397 times.
Step 1: 0 + 255 = 255
Step 2: 255 + 255 = 510
Step 3: 510 + 255 = 765
Step 4: 765 + 255 = 1020
Step 5: 1020 + 255 = 1275
Step 6: 1275 + 255 = 1530
Step 7: 1530 + 255 = 1785
Step 8: 1785 + 255 = 2040
Step 9: 2040 + 255 = 2295
Step 10: 2295 + 255 = 2550
Step 11: 2550 + 255 = 2805
Step 12: 2805 + 255 = 3060
Step 13: 3060 + 255 = 3315
Step 14: 3315 + 255 = 3570
Step 15: 3570 + 255 = 3825
Step 16: 3825 + 255 = 4080
Step 17: 4080 + 255 = 4335
Step 18: 4335 + 255 = 4590
Step 19: 4590 + 255 = 4845
Step 20: 4845 + 255 = 5100
Step 21: 5100 + 255 = 5355
Step 22: 5355 + 255 = 5610
Step 23: 5610 + 255 = 5865
Step 24: 5865 + 255 = 6120
Step 25: 6120 + 255 = 6375
Step 26: 6375 + 255 = 6630
Step 27: 6630 + 255 = 6885
Step 28: 6885 + 255 = 7140
Step 29: 7140 + 255 = 7395
Step 30: 7395 + 255 = 7650
Step 31: 7650 + 255 = 7905
Step 32: 7905 + 255 = 8160
Step 33: 8160 + 255 = 8415
Step 34: 8415 + 255 = 8670
Step 35: 8670 + 255 = 8925
Step 36: 8925 + 255 = 9180
Step 37: 9180 + 255 = 9435
Step 38: 9435 + 255 = 9690
Step 39: 9690 + 255 = 9945
Step 40: 9945 + 255 = 10200
Step 41: 10200 + 255 = 10455
Step 42: 10455 + 255 = 10710
Step 43: 10710 + 255 = 10965
Step 44: 10965 + 255 = 11220
Step 45: 11220 + 255 = 11475
Step 46: 11475 + 255 = 11730
Step 47: 11730 + 255 = 11985
Step 48: 11985 + 255 = 12240
Step 49: 12240 + 255 = 12495
Step 50: 12495 + 255 = 12750
Step 51: 12750 + 255 = 13005
Step 52: 13005 + 255 = 13260
Step 53: 13260 + 255 = 13515
Step 54: 13515 + 255 = 13770
Step 55: 13770 + 255 = 14025
Step 56: 14025 + 255 = 14280
Step 57: 14280 + 255 = 14535
Step 58: 14535 + 255 = 14790
Step 59: 14790 + 255 = 15045
Step 60: 15045 + 255 = 15300
Step 61: 15300 + 255 = 15555
Step 62: 15555 + 255 = 15810
Step 63: 15810 + 255 = 16065
Step 64: 16065 + 255 = 16320
Step 65: 16320 + 255 = 16575
Step 66: 16575 + 255 = 16830
Step 67: 16830 + 255 = 17085
Step 68: 17085 + 255 = 17340
Step 69: 17340 + 255 = 17595
Step 70: 17595 + 255 = 17850
Step 71: 17850 + 255 = 18105
Step 72: 18105 + 255 = 18360
Step 73: 18360 + 255 = 18615
Step 74: 18615 + 255 = 18870
Step 75: 18870 + 255 = 19125
Step 76: 19125 + 255 = 19380
Step 77: 19380 + 255 = 19635
Step 78: 19635 + 255 = 19890
Step 79: 19890 + 255 = 20145
Step 80: 20145 + 255 = 20400
Step 81: 20400 + 255 = 20655
Step 82: 20655 + 255 = 20910
Step 83: 20910 + 255 = 21165
Step 84: 21165 + 255 = 21420
Step 85: 21420 + 255 = 21675
Step 86: 21675 + 255 = 21930
Step 87: 21930 + 255 = 22185
Step 88: 22185 + 255 = 22440
Step 89: 22440 + 255 = 22695
Step 90: 22695 + 255 = 22950
Step 91: 22950 + 255 = 23205
Step 92: 23205 + 255 = 23460
Step 93: 23460 + 255 = 23715
Step 94: 23715 + 255 = 23970
Step 95: 23970 + 255 = 24225
Step 96: 24225 + 255 = 24480
Step 97: 24480 + 255 = 24735
Step 98: 24735 + 255 = 24990
Step 99: 24990 + 255 = 25245
Step 100: 25245 + 255 = 25500
Step 101: 25500 + 255 = 25755
Step 102: 25755 + 255 = 26010
Step 103: 26010 + 255 = 26265
Step 104: 26265 + 255 = 26520
Step 105: 26520 + 255 = 26775
Step 106: 26775 + 255 = 27030
Step 107: 27030 + 255 = 27285
Step 108: 27285 + 255 = 27540
Step 109: 27540 + 255 = 27795
Step 110: 27795 + 255 = 28050
Step 111: 28050 + 255 = 28305
Step 112: 28305 + 255 = 28560
Step 113: 28560 + 255 = 28815
Step 114: 28815 + 255 = 29070
Step 115: 29070 + 255 = 29325
Step 116: 29325 + 255 = 29580
Step 117: 29580 + 255 = 29835
Step 118: 29835 + 255 = 30090
Step 119: 30090 + 255 = 30345
Step 120: 30345 + 255 = 30600
Step 121: 30600 + 255 = 30855
Step 122: 30855 + 255 = 31110
Step 123: 31110 + 255 = 31365
Step 124: 31365 + 255 = 31620
Step 125: 31620 + 255 = 31875
Step 126: 31875 + 255 = 32130
Step 127: 32130 + 255 = 32385
Step 128: 32385 + 255 = 32640
Step 129: 32640 + 255 = 32895
Step 130: 32895 + 255 = 33150
Step 131: 33150 + 255 = 33405
Step 132: 33405 + 255 = 33660
Step 133: 33660 + 255 = 33915
Step 134: 33915 + 255 = 34170
Step 135: 34170 + 255 = 34425
Step 136: 34425 + 255 = 34680
Step 137: 34680 + 255 = 34935
Step 138: 34935 + 255 = 35190
Step 139: 35190 + 255 = 35445
Step 140: 35445 + 255 = 35700
Step 141: 35700 + 255 = 35955
Step 142: 35955 + 255 = 36210
Step 143: 36210 + 255 = 36465
Step 144: 36465 + 255 = 36720
Step 145: 36720 + 255 = 36975
Step 146: 36975 + 255 = 37230
Step 147: 37230 + 255 = 37485
Step 148: 37485 + 255 = 37740
Step 149: 37740 + 255 = 37995
Step 150: 37995 + 255 = 38250
Step 151: 38250 + 255 = 38505
Step 152: 38505 + 255 = 38760
Step 153: 38760 + 255 = 39015
Step 154: 39015 + 255 = 39270
Step 155: 39270 + 255 = 39525
Step 156: 39525 + 255 = 39780
Step 157: 39780 + 255 = 40035
Step 158: 40035 + 255 = 40290
Step 159: 40290 + 255 = 40545
Step 160: 40545 + 255 = 40800
Step 161: 40800 + 255 = 41055
Step 162: 41055 + 255 = 41310
Step 163: 41310 + 255 = 41565
Step 164: 41565 + 255 = 41820
Step 165: 41820 + 255 = 42075
Step 166: 42075 + 255 = 42330
Step 167: 42330 + 255 = 42585
Step 168: 42585 + 255 = 42840
Step 169: 42840 + 255 = 43095
Step 170: 43095 + 255 = 43350
Step 171: 43350 + 255 = 43605
Step 172: 43605 + 255 = 43860
Step 173: 43860 + 255 = 44115
Step 174: 44115 + 255 = 44370
Step 175: 44370 + 255 = 44625
Step 176: 44625 + 255 = 44880
Step 177: 44880 + 255 = 45135
Step 178: 45135 + 255 = 45390
Step 179: 45390 + 255 = 45645
Step 180: 45645 + 255 = 45900
Step 181: 45900 + 255 = 46155
Step 182: 46155 + 255 = 46410
Step 183: 46410 + 255 = 46665
Step 184: 46665 + 255 = 46920
Step 185: 46920 + 255 = 47175
Step 186: 47175 + 255 = 47430
Step 187: 47430 + 255 = 47685
Step 188: 47685 + 255 = 47940
Step 189: 47940 + 255 = 48195
Step 190: 48195 + 255 = 48450
Step 191: 48450 + 255 = 48705
Step 192: 48705 + 255 = 48960
Step 193: 48960 + 255 = 49215
Step 194: 49215 + 255 = 49470
Step 195: 49470 + 255 = 49725
Step 196: 49725 + 255 = 49980
Step 197: 49980 + 255 = 50235
Step 198: 50235 + 255 = 50490
Step 199: 50490 + 255 = 50745
Step 200: 50745 + 255 = 51000
Step 201: 51000 + 255 = 51255
Step 202: 51255 + 255 = 51510
Step 203: 51510 + 255 = 51765
Step 204: 51765 + 255 = 52020
Step 205: 52020 + 255 = 52275
Step 206: 52275 + 255 = 52530
Step 207: 52530 + 255 = 52785
Step 208: 52785 + 255 = 53040
Step 209: 53040 + 255 = 53295
Step 210: 53295 + 255 = 53550
Step 211: 53550 + 255 = 53805
Step 212: 53805 + 255 = 54060
Step 213: 54060 + 255 = 54315
Step 214: 54315 + 255 = 54570
Step 215: 54570 + 255 = 54825
Step 216: 54825 + 255 = 55080
Step 217: 55080 + 255 = 55335
Step 218: 55335 + 255 = 55590
Step 219: 55590 + 255 = 55845
Step 220: 55845 + 255 = 56100
Step 221: 56100 + 255 = 56355
Step 222: 56355 + 255 = 56610
Step 223: 56610 + 255 = 56865
Step 224: 56865 + 255 = 57120
Step 225: 57120 + 255 = 57375
Step 226: 57375 + 255 = 57630
Step 227: 57630 + 255 = 57885
Step 228: 57885 + 255 = 58140
Step 229: 58140 + 255 = 58395
Step 230: 58395 + 255 = 58650
Step 231: 58650 + 255 = 58905
Step 232: 58905 + 255 = 59160
Step 233: 59160 + 255 = 59415
Step 234: 59415 + 255 = 59670
Step 235: 59670 + 255 = 59925
Step 236: 59925 + 255 = 60180
Step 237: 60180 + 255 = 60435
Step 238: 60435 + 255 = 60690
Step 239: 60690 + 255 = 60945
Step 240: 60945 + 255 = 61200
Step 241: 61200 + 255 = 61455
Step 242: 61455 + 255 = 61710
Step 243: 61710 + 255 = 61965
Step 244: 61965 + 255 = 62220
Step 245: 62220 + 255 = 62475
Step 246: 62475 + 255 = 62730
Step 247: 62730 + 255 = 62985
Step 248: 62985 + 255 = 63240
Step 249: 63240 + 255 = 63495
Step 250: 63495 + 255 = 63750
Step 251: 63750 + 255 = 64005
Step 252: 64005 + 255 = 64260
Step 253: 64260 + 255 = 64515
Step 254: 64515 + 255 = 64770
Step 255: 64770 + 255 = 65025
Step 256: 65025 + 255 = 65280
Step 257: 65280 + 255 = 65535
Step 258: 65535 + 255 = 65790
Step 259: 65790 + 255 = 66045
Step 260: 66045 + 255 = 66300
Step 261: 66300 + 255 = 66555
Step 262: 66555 + 255 = 66810
Step 263: 66810 + 255 = 67065
Step 264: 67065 + 255 = 67320
Step 265: 67320 + 255 = 67575
Step 266: 67575 + 255 = 67830
Step 267: 67830 + 255 = 68085
Step 268: 68085 + 255 = 68340
Step 269: 68340 + 255 = 68595
Step 270: 68595 + 255 = 68850
Step 271: 68850 + 255 = 69105
Step 272: 69105 + 255 = 69360
Step 273: 69360 + 255 = 69615
Step 274: 69615 + 255 = 69870
Step 275: 69870 + 255 = 70125
Step 276: 70125 + 255 = 70380
Step 277: 70380 + 255 = 70635
Step 278: 70635 + 255 = 70890
Step 279: 70890 + 255 = 71145
Step 280: 71145 + 255 = 71400
Step 281: 71400 + 255 = 71655
Step 282: 71655 + 255 = 71910
Step 283: 71910 + 255 = 72165
Step 284: 72165 + 255 = 72420
Step 285: 72420 + 255 = 72675
Step 286: 72675 + 255 = 72930
Step 287: 72930 + 255 = 73185
Step 288: 73185 + 255 = 73440
Step 289: 73440 + 255 = 73695
Step 290: 73695 + 255 = 73950
Step 291: 73950 + 255 = 74205
Step 292: 74205 + 255 = 74460
Step 293: 74460 + 255 = 74715
Step 294: 74715 + 255 = 74970
Step 295: 74970 + 255 = 75225
Step 296: 75225 + 255 = 75480
Step 297: 75480 + 255 = 75735
Step 298: 75735 + 255 = 75990
Step 299: 75990 + 255 = 76245
Step 300: 76245 + 255 = 76500
Step 301: 76500 + 255 = 76755
Step 302: 76755 + 255 = 77010
Step 303: 77010 + 255 = 77265
Step 304: 77265 + 255 = 77520
Step 305: 77520 + 255 = 77775
Step 306: 77775 + 255 = 78030
Step 307: 78030 + 255 = 78285
Step 308: 78285 + 255 = 78540
Step 309: 78540 + 255 = 78795
Step 310: 78795 + 255 = 79050
Step 311: 79050 + 255 = 79305
Step 312: 79305 + 255 = 79560
Step 313: 79560 + 255 = 79815
Step 314: 79815 + 255 = 80070
Step 315: 80070 + 255 = 80325
Step 316: 80325 + 255 = 80580
Step 317: 80580 + 255 = 80835
Step 318: 80835 + 255 = 81090
Step 319: 81090 + 255 = 81345
Step 320: 81345 + 255 = 81600
Step 321: 81600 + 255 = 81855
Step 322: 81855 + 255 = 82110
Step 323: 82110 + 255 = 82365
Step 324: 82365 + 255 = 82620
Step 325: 82620 + 255 = 82875
Step 326: 82875 + 255 = 83130
Step 327: 83130 + 255 = 83385
Step 328: 83385 + 255 = 83640
Step 329: 83640 + 255 = 83895
Step 330: 83895 + 255 = 84150
Step 331: 84150 + 255 = 84405
Step 332: 84405 + 255 = 84660
Step 333: 84660 + 255 = 84915
Step 334: 84915 + 255 = 85170
Step 335: 85170 + 255 = 85425
Step 336: 85425 + 255 = 85680
Step 337: 85680 + 255 = 85935
Step 338: 85935 + 255 = 86190
Step 339: 86190 + 255 = 86445
Step 340: 86445 + 255 = 86700
Step 341: 86700 + 255 = 86955
Step 342: 86955 + 255 = 87210
Step 343: 87210 + 255 = 87465
Step 344: 87465 + 255 = 87720
Step 345: 87720 + 255 = 87975
Step 346: 87975 + 255 = 88230
Step 347: 88230 + 255 = 88485
Step 348: 88485 + 255 = 88740
Step 349: 88740 + 255 = 88995
Step 350: 88995 + 255 = 89250
Step 351: 89250 + 255 = 89505
Step 352: 89505 + 255 = 89760
Step 353: 89760 + 255 = 90015
Step 354: 90015 + 255 = 90270
Step 355: 90270 + 255 = 90525
Step 356: 90525 + 255 = 90780
Step 357: 90780 + 255 = 91035
Step 358: 91035 + 255 = 91290
Step 359: 91290 + 255 = 91545
Step 360: 91545 + 255 = 91800
Step 361: 91800 + 255 = 92055
Step 362: 92055 + 255 = 92310
Step 363: 92310 + 255 = 92565
Step 364: 92565 + 255 = 92820
Step 365: 92820 + 255 = 93075
Step 366: 93075 + 255 = 93330
Step 367: 93330 + 255 = 93585
Step 368: 93585 + 255 = 93840
Step 369: 93840 + 255 = 94095
Step 370: 94095 + 255 = 94350
Step 371: 94350 + 255 = 94605
Step 372: 94605 + 255 = 94860
Step 373: 94860 + 255 = 95115
Step 374: 95115 + 255 = 95370
Step 375: 95370 + 255 = 95625
Step 376: 95625 + 255 = 95880
Step 377: 95880 + 255 = 96135
Step 378: 96135 + 255 = 96390
Step 379: 96390 + 255 = 96645
Step 380: 96645 + 255 = 96900
Step 381: 96900 + 255 = 97155
Step 382: 97155 + 255 = 97410
Step 383: 97410 + 255 = 97665
Step 384: 97665 + 255 = 97920
Step 385: 97920 + 255 = 98175
Step 386: 98175 + 255 = 98430
Step 387: 98430 + 255 = 98685
Step 388: 98685 + 255 = 98940
Step 389: 98940 + 255 = 99195
Step 390: 99195 + 255 = 99450
Step 391: 99450 + 255 = 99705
Step 392: 99705 + 255 = 99960
Step 393: 99960 + 255 = 100215
Step 394: 100215 + 255 = 100470
Step 395: 100470 + 255 = 100725
Step 396: 100725 + 255 = 100980
Step 397: 100980 + 255 = 101235

So, 255*397 = 101235