Sure thing, let's get straight to it. We start with 401 and we're going to multiply it by 339, which means adding 401 to itself 339 times.
Step 1: 0 + 401 = 401
Step 2: 401 + 401 = 802
Step 3: 802 + 401 = 1203
Step 4: 1203 + 401 = 1604
Step 5: 1604 + 401 = 2005
Step 6: 2005 + 401 = 2406
Step 7: 2406 + 401 = 2807
Step 8: 2807 + 401 = 3208
Step 9: 3208 + 401 = 3609
Step 10: 3609 + 401 = 4010
Step 11: 4010 + 401 = 4411
Step 12: 4411 + 401 = 4812
Step 13: 4812 + 401 = 5213
Step 14: 5213 + 401 = 5614
Step 15: 5614 + 401 = 6015
Step 16: 6015 + 401 = 6416
Step 17: 6416 + 401 = 6817
Step 18: 6817 + 401 = 7218
Step 19: 7218 + 401 = 7619
Step 20: 7619 + 401 = 8020
Step 21: 8020 + 401 = 8421
Step 22: 8421 + 401 = 8822
Step 23: 8822 + 401 = 9223
Step 24: 9223 + 401 = 9624
Step 25: 9624 + 401 = 10025
Step 26: 10025 + 401 = 10426
Step 27: 10426 + 401 = 10827
Step 28: 10827 + 401 = 11228
Step 29: 11228 + 401 = 11629
Step 30: 11629 + 401 = 12030
Step 31: 12030 + 401 = 12431
Step 32: 12431 + 401 = 12832
Step 33: 12832 + 401 = 13233
Step 34: 13233 + 401 = 13634
Step 35: 13634 + 401 = 14035
Step 36: 14035 + 401 = 14436
Step 37: 14436 + 401 = 14837
Step 38: 14837 + 401 = 15238
Step 39: 15238 + 401 = 15639
Step 40: 15639 + 401 = 16040
Step 41: 16040 + 401 = 16441
Step 42: 16441 + 401 = 16842
Step 43: 16842 + 401 = 17243
Step 44: 17243 + 401 = 17644
Step 45: 17644 + 401 = 18045
Step 46: 18045 + 401 = 18446
Step 47: 18446 + 401 = 18847
Step 48: 18847 + 401 = 19248
Step 49: 19248 + 401 = 19649
Step 50: 19649 + 401 = 20050
Step 51: 20050 + 401 = 20451
Step 52: 20451 + 401 = 20852
Step 53: 20852 + 401 = 21253
Step 54: 21253 + 401 = 21654
Step 55: 21654 + 401 = 22055
Step 56: 22055 + 401 = 22456
Step 57: 22456 + 401 = 22857
Step 58: 22857 + 401 = 23258
Step 59: 23258 + 401 = 23659
Step 60: 23659 + 401 = 24060
Step 61: 24060 + 401 = 24461
Step 62: 24461 + 401 = 24862
Step 63: 24862 + 401 = 25263
Step 64: 25263 + 401 = 25664
Step 65: 25664 + 401 = 26065
Step 66: 26065 + 401 = 26466
Step 67: 26466 + 401 = 26867
Step 68: 26867 + 401 = 27268
Step 69: 27268 + 401 = 27669
Step 70: 27669 + 401 = 28070
Step 71: 28070 + 401 = 28471
Step 72: 28471 + 401 = 28872
Step 73: 28872 + 401 = 29273
Step 74: 29273 + 401 = 29674
Step 75: 29674 + 401 = 30075
Step 76: 30075 + 401 = 30476
Step 77: 30476 + 401 = 30877
Step 78: 30877 + 401 = 31278
Step 79: 31278 + 401 = 31679
Step 80: 31679 + 401 = 32080
Step 81: 32080 + 401 = 32481
Step 82: 32481 + 401 = 32882
Step 83: 32882 + 401 = 33283
Step 84: 33283 + 401 = 33684
Step 85: 33684 + 401 = 34085
Step 86: 34085 + 401 = 34486
Step 87: 34486 + 401 = 34887
Step 88: 34887 + 401 = 35288
Step 89: 35288 + 401 = 35689
Step 90: 35689 + 401 = 36090
Step 91: 36090 + 401 = 36491
Step 92: 36491 + 401 = 36892
Step 93: 36892 + 401 = 37293
Step 94: 37293 + 401 = 37694
Step 95: 37694 + 401 = 38095
Step 96: 38095 + 401 = 38496
Step 97: 38496 + 401 = 38897
Step 98: 38897 + 401 = 39298
Step 99: 39298 + 401 = 39699
Step 100: 39699 + 401 = 40100
Step 101: 40100 + 401 = 40501
Step 102: 40501 + 401 = 40902
Step 103: 40902 + 401 = 41303
Step 104: 41303 + 401 = 41704
Step 105: 41704 + 401 = 42105
Step 106: 42105 + 401 = 42506
Step 107: 42506 + 401 = 42907
Step 108: 42907 + 401 = 43308
Step 109: 43308 + 401 = 43709
Step 110: 43709 + 401 = 44110
Step 111: 44110 + 401 = 44511
Step 112: 44511 + 401 = 44912
Step 113: 44912 + 401 = 45313
Step 114: 45313 + 401 = 45714
Step 115: 45714 + 401 = 46115
Step 116: 46115 + 401 = 46516
Step 117: 46516 + 401 = 46917
Step 118: 46917 + 401 = 47318
Step 119: 47318 + 401 = 47719
Step 120: 47719 + 401 = 48120
Step 121: 48120 + 401 = 48521
Step 122: 48521 + 401 = 48922
Step 123: 48922 + 401 = 49323
Step 124: 49323 + 401 = 49724
Step 125: 49724 + 401 = 50125
Step 126: 50125 + 401 = 50526
Step 127: 50526 + 401 = 50927
Step 128: 50927 + 401 = 51328
Step 129: 51328 + 401 = 51729
Step 130: 51729 + 401 = 52130
Step 131: 52130 + 401 = 52531
Step 132: 52531 + 401 = 52932
Step 133: 52932 + 401 = 53333
Step 134: 53333 + 401 = 53734
Step 135: 53734 + 401 = 54135
Step 136: 54135 + 401 = 54536
Step 137: 54536 + 401 = 54937
Step 138: 54937 + 401 = 55338
Step 139: 55338 + 401 = 55739
Step 140: 55739 + 401 = 56140
Step 141: 56140 + 401 = 56541
Step 142: 56541 + 401 = 56942
Step 143: 56942 + 401 = 57343
Step 144: 57343 + 401 = 57744
Step 145: 57744 + 401 = 58145
Step 146: 58145 + 401 = 58546
Step 147: 58546 + 401 = 58947
Step 148: 58947 + 401 = 59348
Step 149: 59348 + 401 = 59749
Step 150: 59749 + 401 = 60150
Step 151: 60150 + 401 = 60551
Step 152: 60551 + 401 = 60952
Step 153: 60952 + 401 = 61353
Step 154: 61353 + 401 = 61754
Step 155: 61754 + 401 = 62155
Step 156: 62155 + 401 = 62556
Step 157: 62556 + 401 = 62957
Step 158: 62957 + 401 = 63358
Step 159: 63358 + 401 = 63759
Step 160: 63759 + 401 = 64160
Step 161: 64160 + 401 = 64561
Step 162: 64561 + 401 = 64962
Step 163: 64962 + 401 = 65363
Step 164: 65363 + 401 = 65764
Step 165: 65764 + 401 = 66165
Step 166: 66165 + 401 = 66566
Step 167: 66566 + 401 = 66967
Step 168: 66967 + 401 = 67368
Step 169: 67368 + 401 = 67769
Step 170: 67769 + 401 = 68170
Step 171: 68170 + 401 = 68571
Step 172: 68571 + 401 = 68972
Step 173: 68972 + 401 = 69373
Step 174: 69373 + 401 = 69774
Step 175: 69774 + 401 = 70175
Step 176: 70175 + 401 = 70576
Step 177: 70576 + 401 = 70977
Step 178: 70977 + 401 = 71378
Step 179: 71378 + 401 = 71779
Step 180: 71779 + 401 = 72180
Step 181: 72180 + 401 = 72581
Step 182: 72581 + 401 = 72982
Step 183: 72982 + 401 = 73383
Step 184: 73383 + 401 = 73784
Step 185: 73784 + 401 = 74185
Step 186: 74185 + 401 = 74586
Step 187: 74586 + 401 = 74987
Step 188: 74987 + 401 = 75388
Step 189: 75388 + 401 = 75789
Step 190: 75789 + 401 = 76190
Step 191: 76190 + 401 = 76591
Step 192: 76591 + 401 = 76992
Step 193: 76992 + 401 = 77393
Step 194: 77393 + 401 = 77794
Step 195: 77794 + 401 = 78195
Step 196: 78195 + 401 = 78596
Step 197: 78596 + 401 = 78997
Step 198: 78997 + 401 = 79398
Step 199: 79398 + 401 = 79799
Step 200: 79799 + 401 = 80200
Step 201: 80200 + 401 = 80601
Step 202: 80601 + 401 = 81002
Step 203: 81002 + 401 = 81403
Step 204: 81403 + 401 = 81804
Step 205: 81804 + 401 = 82205
Step 206: 82205 + 401 = 82606
Step 207: 82606 + 401 = 83007
Step 208: 83007 + 401 = 83408
Step 209: 83408 + 401 = 83809
Step 210: 83809 + 401 = 84210
Step 211: 84210 + 401 = 84611
Step 212: 84611 + 401 = 85012
Step 213: 85012 + 401 = 85413
Step 214: 85413 + 401 = 85814
Step 215: 85814 + 401 = 86215
Step 216: 86215 + 401 = 86616
Step 217: 86616 + 401 = 87017
Step 218: 87017 + 401 = 87418
Step 219: 87418 + 401 = 87819
Step 220: 87819 + 401 = 88220
Step 221: 88220 + 401 = 88621
Step 222: 88621 + 401 = 89022
Step 223: 89022 + 401 = 89423
Step 224: 89423 + 401 = 89824
Step 225: 89824 + 401 = 90225
Step 226: 90225 + 401 = 90626
Step 227: 90626 + 401 = 91027
Step 228: 91027 + 401 = 91428
Step 229: 91428 + 401 = 91829
Step 230: 91829 + 401 = 92230
Step 231: 92230 + 401 = 92631
Step 232: 92631 + 401 = 93032
Step 233: 93032 + 401 = 93433
Step 234: 93433 + 401 = 93834
Step 235: 93834 + 401 = 94235
Step 236: 94235 + 401 = 94636
Step 237: 94636 + 401 = 95037
Step 238: 95037 + 401 = 95438
Step 239: 95438 + 401 = 95839
Step 240: 95839 + 401 = 96240
Step 241: 96240 + 401 = 96641
Step 242: 96641 + 401 = 97042
Step 243: 97042 + 401 = 97443
Step 244: 97443 + 401 = 97844
Step 245: 97844 + 401 = 98245
Step 246: 98245 + 401 = 98646
Step 247: 98646 + 401 = 99047
Step 248: 99047 + 401 = 99448
Step 249: 99448 + 401 = 99849
Step 250: 99849 + 401 = 100250
Step 251: 100250 + 401 = 100651
Step 252: 100651 + 401 = 101052
Step 253: 101052 + 401 = 101453
Step 254: 101453 + 401 = 101854
Step 255: 101854 + 401 = 102255
Step 256: 102255 + 401 = 102656
Step 257: 102656 + 401 = 103057
Step 258: 103057 + 401 = 103458
Step 259: 103458 + 401 = 103859
Step 260: 103859 + 401 = 104260
Step 261: 104260 + 401 = 104661
Step 262: 104661 + 401 = 105062
Step 263: 105062 + 401 = 105463
Step 264: 105463 + 401 = 105864
Step 265: 105864 + 401 = 106265
Step 266: 106265 + 401 = 106666
Step 267: 106666 + 401 = 107067
Step 268: 107067 + 401 = 107468
Step 269: 107468 + 401 = 107869
Step 270: 107869 + 401 = 108270
Step 271: 108270 + 401 = 108671
Step 272: 108671 + 401 = 109072
Step 273: 109072 + 401 = 109473
Step 274: 109473 + 401 = 109874
Step 275: 109874 + 401 = 110275
Step 276: 110275 + 401 = 110676
Step 277: 110676 + 401 = 111077
Step 278: 111077 + 401 = 111478
Step 279: 111478 + 401 = 111879
Step 280: 111879 + 401 = 112280
Step 281: 112280 + 401 = 112681
Step 282: 112681 + 401 = 113082
Step 283: 113082 + 401 = 113483
Step 284: 113483 + 401 = 113884
Step 285: 113884 + 401 = 114285
Step 286: 114285 + 401 = 114686
Step 287: 114686 + 401 = 115087
Step 288: 115087 + 401 = 115488
Step 289: 115488 + 401 = 115889
Step 290: 115889 + 401 = 116290
Step 291: 116290 + 401 = 116691
Step 292: 116691 + 401 = 117092
Step 293: 117092 + 401 = 117493
Step 294: 117493 + 401 = 117894
Step 295: 117894 + 401 = 118295
Step 296: 118295 + 401 = 118696
Step 297: 118696 + 401 = 119097
Step 298: 119097 + 401 = 119498
Step 299: 119498 + 401 = 119899
Step 300: 119899 + 401 = 120300
Step 301: 120300 + 401 = 120701
Step 302: 120701 + 401 = 121102
Step 303: 121102 + 401 = 121503
Step 304: 121503 + 401 = 121904
Step 305: 121904 + 401 = 122305
Step 306: 122305 + 401 = 122706
Step 307: 122706 + 401 = 123107
Step 308: 123107 + 401 = 123508
Step 309: 123508 + 401 = 123909
Step 310: 123909 + 401 = 124310
Step 311: 124310 + 401 = 124711
Step 312: 124711 + 401 = 125112
Step 313: 125112 + 401 = 125513
Step 314: 125513 + 401 = 125914
Step 315: 125914 + 401 = 126315
Step 316: 126315 + 401 = 126716
Step 317: 126716 + 401 = 127117
Step 318: 127117 + 401 = 127518
Step 319: 127518 + 401 = 127919
Step 320: 127919 + 401 = 128320
Step 321: 128320 + 401 = 128721
Step 322: 128721 + 401 = 129122
Step 323: 129122 + 401 = 129523
Step 324: 129523 + 401 = 129924
Step 325: 129924 + 401 = 130325
Step 326: 130325 + 401 = 130726
Step 327: 130726 + 401 = 131127
Step 328: 131127 + 401 = 131528
Step 329: 131528 + 401 = 131929
Step 330: 131929 + 401 = 132330
Step 331: 132330 + 401 = 132731
Step 332: 132731 + 401 = 133132
Step 333: 133132 + 401 = 133533
Step 334: 133533 + 401 = 133934
Step 335: 133934 + 401 = 134335
Step 336: 134335 + 401 = 134736
Step 337: 134736 + 401 = 135137
Step 338: 135137 + 401 = 135538
Step 339: 135538 + 401 = 135939

So, 401*339 = 135939