OK, let's crack this. We're given 823 and our task is to multiply it by 401. Essentially, we'll be adding 823 to itself 401 times.
Step 1: 0 + 823 = 823
Step 2: 823 + 823 = 1646
Step 3: 1646 + 823 = 2469
Step 4: 2469 + 823 = 3292
Step 5: 3292 + 823 = 4115
Step 6: 4115 + 823 = 4938
Step 7: 4938 + 823 = 5761
Step 8: 5761 + 823 = 6584
Step 9: 6584 + 823 = 7407
Step 10: 7407 + 823 = 8230
Step 11: 8230 + 823 = 9053
Step 12: 9053 + 823 = 9876
Step 13: 9876 + 823 = 10699
Step 14: 10699 + 823 = 11522
Step 15: 11522 + 823 = 12345
Step 16: 12345 + 823 = 13168
Step 17: 13168 + 823 = 13991
Step 18: 13991 + 823 = 14814
Step 19: 14814 + 823 = 15637
Step 20: 15637 + 823 = 16460
Step 21: 16460 + 823 = 17283
Step 22: 17283 + 823 = 18106
Step 23: 18106 + 823 = 18929
Step 24: 18929 + 823 = 19752
Step 25: 19752 + 823 = 20575
Step 26: 20575 + 823 = 21398
Step 27: 21398 + 823 = 22221
Step 28: 22221 + 823 = 23044
Step 29: 23044 + 823 = 23867
Step 30: 23867 + 823 = 24690
Step 31: 24690 + 823 = 25513
Step 32: 25513 + 823 = 26336
Step 33: 26336 + 823 = 27159
Step 34: 27159 + 823 = 27982
Step 35: 27982 + 823 = 28805
Step 36: 28805 + 823 = 29628
Step 37: 29628 + 823 = 30451
Step 38: 30451 + 823 = 31274
Step 39: 31274 + 823 = 32097
Step 40: 32097 + 823 = 32920
Step 41: 32920 + 823 = 33743
Step 42: 33743 + 823 = 34566
Step 43: 34566 + 823 = 35389
Step 44: 35389 + 823 = 36212
Step 45: 36212 + 823 = 37035
Step 46: 37035 + 823 = 37858
Step 47: 37858 + 823 = 38681
Step 48: 38681 + 823 = 39504
Step 49: 39504 + 823 = 40327
Step 50: 40327 + 823 = 41150
Step 51: 41150 + 823 = 41973
Step 52: 41973 + 823 = 42796
Step 53: 42796 + 823 = 43619
Step 54: 43619 + 823 = 44442
Step 55: 44442 + 823 = 45265
Step 56: 45265 + 823 = 46088
Step 57: 46088 + 823 = 46911
Step 58: 46911 + 823 = 47734
Step 59: 47734 + 823 = 48557
Step 60: 48557 + 823 = 49380
Step 61: 49380 + 823 = 50203
Step 62: 50203 + 823 = 51026
Step 63: 51026 + 823 = 51849
Step 64: 51849 + 823 = 52672
Step 65: 52672 + 823 = 53495
Step 66: 53495 + 823 = 54318
Step 67: 54318 + 823 = 55141
Step 68: 55141 + 823 = 55964
Step 69: 55964 + 823 = 56787
Step 70: 56787 + 823 = 57610
Step 71: 57610 + 823 = 58433
Step 72: 58433 + 823 = 59256
Step 73: 59256 + 823 = 60079
Step 74: 60079 + 823 = 60902
Step 75: 60902 + 823 = 61725
Step 76: 61725 + 823 = 62548
Step 77: 62548 + 823 = 63371
Step 78: 63371 + 823 = 64194
Step 79: 64194 + 823 = 65017
Step 80: 65017 + 823 = 65840
Step 81: 65840 + 823 = 66663
Step 82: 66663 + 823 = 67486
Step 83: 67486 + 823 = 68309
Step 84: 68309 + 823 = 69132
Step 85: 69132 + 823 = 69955
Step 86: 69955 + 823 = 70778
Step 87: 70778 + 823 = 71601
Step 88: 71601 + 823 = 72424
Step 89: 72424 + 823 = 73247
Step 90: 73247 + 823 = 74070
Step 91: 74070 + 823 = 74893
Step 92: 74893 + 823 = 75716
Step 93: 75716 + 823 = 76539
Step 94: 76539 + 823 = 77362
Step 95: 77362 + 823 = 78185
Step 96: 78185 + 823 = 79008
Step 97: 79008 + 823 = 79831
Step 98: 79831 + 823 = 80654
Step 99: 80654 + 823 = 81477
Step 100: 81477 + 823 = 82300
Step 101: 82300 + 823 = 83123
Step 102: 83123 + 823 = 83946
Step 103: 83946 + 823 = 84769
Step 104: 84769 + 823 = 85592
Step 105: 85592 + 823 = 86415
Step 106: 86415 + 823 = 87238
Step 107: 87238 + 823 = 88061
Step 108: 88061 + 823 = 88884
Step 109: 88884 + 823 = 89707
Step 110: 89707 + 823 = 90530
Step 111: 90530 + 823 = 91353
Step 112: 91353 + 823 = 92176
Step 113: 92176 + 823 = 92999
Step 114: 92999 + 823 = 93822
Step 115: 93822 + 823 = 94645
Step 116: 94645 + 823 = 95468
Step 117: 95468 + 823 = 96291
Step 118: 96291 + 823 = 97114
Step 119: 97114 + 823 = 97937
Step 120: 97937 + 823 = 98760
Step 121: 98760 + 823 = 99583
Step 122: 99583 + 823 = 100406
Step 123: 100406 + 823 = 101229
Step 124: 101229 + 823 = 102052
Step 125: 102052 + 823 = 102875
Step 126: 102875 + 823 = 103698
Step 127: 103698 + 823 = 104521
Step 128: 104521 + 823 = 105344
Step 129: 105344 + 823 = 106167
Step 130: 106167 + 823 = 106990
Step 131: 106990 + 823 = 107813
Step 132: 107813 + 823 = 108636
Step 133: 108636 + 823 = 109459
Step 134: 109459 + 823 = 110282
Step 135: 110282 + 823 = 111105
Step 136: 111105 + 823 = 111928
Step 137: 111928 + 823 = 112751
Step 138: 112751 + 823 = 113574
Step 139: 113574 + 823 = 114397
Step 140: 114397 + 823 = 115220
Step 141: 115220 + 823 = 116043
Step 142: 116043 + 823 = 116866
Step 143: 116866 + 823 = 117689
Step 144: 117689 + 823 = 118512
Step 145: 118512 + 823 = 119335
Step 146: 119335 + 823 = 120158
Step 147: 120158 + 823 = 120981
Step 148: 120981 + 823 = 121804
Step 149: 121804 + 823 = 122627
Step 150: 122627 + 823 = 123450
Step 151: 123450 + 823 = 124273
Step 152: 124273 + 823 = 125096
Step 153: 125096 + 823 = 125919
Step 154: 125919 + 823 = 126742
Step 155: 126742 + 823 = 127565
Step 156: 127565 + 823 = 128388
Step 157: 128388 + 823 = 129211
Step 158: 129211 + 823 = 130034
Step 159: 130034 + 823 = 130857
Step 160: 130857 + 823 = 131680
Step 161: 131680 + 823 = 132503
Step 162: 132503 + 823 = 133326
Step 163: 133326 + 823 = 134149
Step 164: 134149 + 823 = 134972
Step 165: 134972 + 823 = 135795
Step 166: 135795 + 823 = 136618
Step 167: 136618 + 823 = 137441
Step 168: 137441 + 823 = 138264
Step 169: 138264 + 823 = 139087
Step 170: 139087 + 823 = 139910
Step 171: 139910 + 823 = 140733
Step 172: 140733 + 823 = 141556
Step 173: 141556 + 823 = 142379
Step 174: 142379 + 823 = 143202
Step 175: 143202 + 823 = 144025
Step 176: 144025 + 823 = 144848
Step 177: 144848 + 823 = 145671
Step 178: 145671 + 823 = 146494
Step 179: 146494 + 823 = 147317
Step 180: 147317 + 823 = 148140
Step 181: 148140 + 823 = 148963
Step 182: 148963 + 823 = 149786
Step 183: 149786 + 823 = 150609
Step 184: 150609 + 823 = 151432
Step 185: 151432 + 823 = 152255
Step 186: 152255 + 823 = 153078
Step 187: 153078 + 823 = 153901
Step 188: 153901 + 823 = 154724
Step 189: 154724 + 823 = 155547
Step 190: 155547 + 823 = 156370
Step 191: 156370 + 823 = 157193
Step 192: 157193 + 823 = 158016
Step 193: 158016 + 823 = 158839
Step 194: 158839 + 823 = 159662
Step 195: 159662 + 823 = 160485
Step 196: 160485 + 823 = 161308
Step 197: 161308 + 823 = 162131
Step 198: 162131 + 823 = 162954
Step 199: 162954 + 823 = 163777
Step 200: 163777 + 823 = 164600
Step 201: 164600 + 823 = 165423
Step 202: 165423 + 823 = 166246
Step 203: 166246 + 823 = 167069
Step 204: 167069 + 823 = 167892
Step 205: 167892 + 823 = 168715
Step 206: 168715 + 823 = 169538
Step 207: 169538 + 823 = 170361
Step 208: 170361 + 823 = 171184
Step 209: 171184 + 823 = 172007
Step 210: 172007 + 823 = 172830
Step 211: 172830 + 823 = 173653
Step 212: 173653 + 823 = 174476
Step 213: 174476 + 823 = 175299
Step 214: 175299 + 823 = 176122
Step 215: 176122 + 823 = 176945
Step 216: 176945 + 823 = 177768
Step 217: 177768 + 823 = 178591
Step 218: 178591 + 823 = 179414
Step 219: 179414 + 823 = 180237
Step 220: 180237 + 823 = 181060
Step 221: 181060 + 823 = 181883
Step 222: 181883 + 823 = 182706
Step 223: 182706 + 823 = 183529
Step 224: 183529 + 823 = 184352
Step 225: 184352 + 823 = 185175
Step 226: 185175 + 823 = 185998
Step 227: 185998 + 823 = 186821
Step 228: 186821 + 823 = 187644
Step 229: 187644 + 823 = 188467
Step 230: 188467 + 823 = 189290
Step 231: 189290 + 823 = 190113
Step 232: 190113 + 823 = 190936
Step 233: 190936 + 823 = 191759
Step 234: 191759 + 823 = 192582
Step 235: 192582 + 823 = 193405
Step 236: 193405 + 823 = 194228
Step 237: 194228 + 823 = 195051
Step 238: 195051 + 823 = 195874
Step 239: 195874 + 823 = 196697
Step 240: 196697 + 823 = 197520
Step 241: 197520 + 823 = 198343
Step 242: 198343 + 823 = 199166
Step 243: 199166 + 823 = 199989
Step 244: 199989 + 823 = 200812
Step 245: 200812 + 823 = 201635
Step 246: 201635 + 823 = 202458
Step 247: 202458 + 823 = 203281
Step 248: 203281 + 823 = 204104
Step 249: 204104 + 823 = 204927
Step 250: 204927 + 823 = 205750
Step 251: 205750 + 823 = 206573
Step 252: 206573 + 823 = 207396
Step 253: 207396 + 823 = 208219
Step 254: 208219 + 823 = 209042
Step 255: 209042 + 823 = 209865
Step 256: 209865 + 823 = 210688
Step 257: 210688 + 823 = 211511
Step 258: 211511 + 823 = 212334
Step 259: 212334 + 823 = 213157
Step 260: 213157 + 823 = 213980
Step 261: 213980 + 823 = 214803
Step 262: 214803 + 823 = 215626
Step 263: 215626 + 823 = 216449
Step 264: 216449 + 823 = 217272
Step 265: 217272 + 823 = 218095
Step 266: 218095 + 823 = 218918
Step 267: 218918 + 823 = 219741
Step 268: 219741 + 823 = 220564
Step 269: 220564 + 823 = 221387
Step 270: 221387 + 823 = 222210
Step 271: 222210 + 823 = 223033
Step 272: 223033 + 823 = 223856
Step 273: 223856 + 823 = 224679
Step 274: 224679 + 823 = 225502
Step 275: 225502 + 823 = 226325
Step 276: 226325 + 823 = 227148
Step 277: 227148 + 823 = 227971
Step 278: 227971 + 823 = 228794
Step 279: 228794 + 823 = 229617
Step 280: 229617 + 823 = 230440
Step 281: 230440 + 823 = 231263
Step 282: 231263 + 823 = 232086
Step 283: 232086 + 823 = 232909
Step 284: 232909 + 823 = 233732
Step 285: 233732 + 823 = 234555
Step 286: 234555 + 823 = 235378
Step 287: 235378 + 823 = 236201
Step 288: 236201 + 823 = 237024
Step 289: 237024 + 823 = 237847
Step 290: 237847 + 823 = 238670
Step 291: 238670 + 823 = 239493
Step 292: 239493 + 823 = 240316
Step 293: 240316 + 823 = 241139
Step 294: 241139 + 823 = 241962
Step 295: 241962 + 823 = 242785
Step 296: 242785 + 823 = 243608
Step 297: 243608 + 823 = 244431
Step 298: 244431 + 823 = 245254
Step 299: 245254 + 823 = 246077
Step 300: 246077 + 823 = 246900
Step 301: 246900 + 823 = 247723
Step 302: 247723 + 823 = 248546
Step 303: 248546 + 823 = 249369
Step 304: 249369 + 823 = 250192
Step 305: 250192 + 823 = 251015
Step 306: 251015 + 823 = 251838
Step 307: 251838 + 823 = 252661
Step 308: 252661 + 823 = 253484
Step 309: 253484 + 823 = 254307
Step 310: 254307 + 823 = 255130
Step 311: 255130 + 823 = 255953
Step 312: 255953 + 823 = 256776
Step 313: 256776 + 823 = 257599
Step 314: 257599 + 823 = 258422
Step 315: 258422 + 823 = 259245
Step 316: 259245 + 823 = 260068
Step 317: 260068 + 823 = 260891
Step 318: 260891 + 823 = 261714
Step 319: 261714 + 823 = 262537
Step 320: 262537 + 823 = 263360
Step 321: 263360 + 823 = 264183
Step 322: 264183 + 823 = 265006
Step 323: 265006 + 823 = 265829
Step 324: 265829 + 823 = 266652
Step 325: 266652 + 823 = 267475
Step 326: 267475 + 823 = 268298
Step 327: 268298 + 823 = 269121
Step 328: 269121 + 823 = 269944
Step 329: 269944 + 823 = 270767
Step 330: 270767 + 823 = 271590
Step 331: 271590 + 823 = 272413
Step 332: 272413 + 823 = 273236
Step 333: 273236 + 823 = 274059
Step 334: 274059 + 823 = 274882
Step 335: 274882 + 823 = 275705
Step 336: 275705 + 823 = 276528
Step 337: 276528 + 823 = 277351
Step 338: 277351 + 823 = 278174
Step 339: 278174 + 823 = 278997
Step 340: 278997 + 823 = 279820
Step 341: 279820 + 823 = 280643
Step 342: 280643 + 823 = 281466
Step 343: 281466 + 823 = 282289
Step 344: 282289 + 823 = 283112
Step 345: 283112 + 823 = 283935
Step 346: 283935 + 823 = 284758
Step 347: 284758 + 823 = 285581
Step 348: 285581 + 823 = 286404
Step 349: 286404 + 823 = 287227
Step 350: 287227 + 823 = 288050
Step 351: 288050 + 823 = 288873
Step 352: 288873 + 823 = 289696
Step 353: 289696 + 823 = 290519
Step 354: 290519 + 823 = 291342
Step 355: 291342 + 823 = 292165
Step 356: 292165 + 823 = 292988
Step 357: 292988 + 823 = 293811
Step 358: 293811 + 823 = 294634
Step 359: 294634 + 823 = 295457
Step 360: 295457 + 823 = 296280
Step 361: 296280 + 823 = 297103
Step 362: 297103 + 823 = 297926
Step 363: 297926 + 823 = 298749
Step 364: 298749 + 823 = 299572
Step 365: 299572 + 823 = 300395
Step 366: 300395 + 823 = 301218
Step 367: 301218 + 823 = 302041
Step 368: 302041 + 823 = 302864
Step 369: 302864 + 823 = 303687
Step 370: 303687 + 823 = 304510
Step 371: 304510 + 823 = 305333
Step 372: 305333 + 823 = 306156
Step 373: 306156 + 823 = 306979
Step 374: 306979 + 823 = 307802
Step 375: 307802 + 823 = 308625
Step 376: 308625 + 823 = 309448
Step 377: 309448 + 823 = 310271
Step 378: 310271 + 823 = 311094
Step 379: 311094 + 823 = 311917
Step 380: 311917 + 823 = 312740
Step 381: 312740 + 823 = 313563
Step 382: 313563 + 823 = 314386
Step 383: 314386 + 823 = 315209
Step 384: 315209 + 823 = 316032
Step 385: 316032 + 823 = 316855
Step 386: 316855 + 823 = 317678
Step 387: 317678 + 823 = 318501
Step 388: 318501 + 823 = 319324
Step 389: 319324 + 823 = 320147
Step 390: 320147 + 823 = 320970
Step 391: 320970 + 823 = 321793
Step 392: 321793 + 823 = 322616
Step 393: 322616 + 823 = 323439
Step 394: 323439 + 823 = 324262
Step 395: 324262 + 823 = 325085
Step 396: 325085 + 823 = 325908
Step 397: 325908 + 823 = 326731
Step 398: 326731 + 823 = 327554
Step 399: 327554 + 823 = 328377
Step 400: 328377 + 823 = 329200
Step 401: 329200 + 823 = 330023

So, 823*401 = 330023