Let's get this math done. We have 831 and we're going to multiply it by 486. This is the same as taking 831 and adding it to itself 486 times.
Step 1: 0 + 831 = 831
Step 2: 831 + 831 = 1662
Step 3: 1662 + 831 = 2493
Step 4: 2493 + 831 = 3324
Step 5: 3324 + 831 = 4155
Step 6: 4155 + 831 = 4986
Step 7: 4986 + 831 = 5817
Step 8: 5817 + 831 = 6648
Step 9: 6648 + 831 = 7479
Step 10: 7479 + 831 = 8310
Step 11: 8310 + 831 = 9141
Step 12: 9141 + 831 = 9972
Step 13: 9972 + 831 = 10803
Step 14: 10803 + 831 = 11634
Step 15: 11634 + 831 = 12465
Step 16: 12465 + 831 = 13296
Step 17: 13296 + 831 = 14127
Step 18: 14127 + 831 = 14958
Step 19: 14958 + 831 = 15789
Step 20: 15789 + 831 = 16620
Step 21: 16620 + 831 = 17451
Step 22: 17451 + 831 = 18282
Step 23: 18282 + 831 = 19113
Step 24: 19113 + 831 = 19944
Step 25: 19944 + 831 = 20775
Step 26: 20775 + 831 = 21606
Step 27: 21606 + 831 = 22437
Step 28: 22437 + 831 = 23268
Step 29: 23268 + 831 = 24099
Step 30: 24099 + 831 = 24930
Step 31: 24930 + 831 = 25761
Step 32: 25761 + 831 = 26592
Step 33: 26592 + 831 = 27423
Step 34: 27423 + 831 = 28254
Step 35: 28254 + 831 = 29085
Step 36: 29085 + 831 = 29916
Step 37: 29916 + 831 = 30747
Step 38: 30747 + 831 = 31578
Step 39: 31578 + 831 = 32409
Step 40: 32409 + 831 = 33240
Step 41: 33240 + 831 = 34071
Step 42: 34071 + 831 = 34902
Step 43: 34902 + 831 = 35733
Step 44: 35733 + 831 = 36564
Step 45: 36564 + 831 = 37395
Step 46: 37395 + 831 = 38226
Step 47: 38226 + 831 = 39057
Step 48: 39057 + 831 = 39888
Step 49: 39888 + 831 = 40719
Step 50: 40719 + 831 = 41550
Step 51: 41550 + 831 = 42381
Step 52: 42381 + 831 = 43212
Step 53: 43212 + 831 = 44043
Step 54: 44043 + 831 = 44874
Step 55: 44874 + 831 = 45705
Step 56: 45705 + 831 = 46536
Step 57: 46536 + 831 = 47367
Step 58: 47367 + 831 = 48198
Step 59: 48198 + 831 = 49029
Step 60: 49029 + 831 = 49860
Step 61: 49860 + 831 = 50691
Step 62: 50691 + 831 = 51522
Step 63: 51522 + 831 = 52353
Step 64: 52353 + 831 = 53184
Step 65: 53184 + 831 = 54015
Step 66: 54015 + 831 = 54846
Step 67: 54846 + 831 = 55677
Step 68: 55677 + 831 = 56508
Step 69: 56508 + 831 = 57339
Step 70: 57339 + 831 = 58170
Step 71: 58170 + 831 = 59001
Step 72: 59001 + 831 = 59832
Step 73: 59832 + 831 = 60663
Step 74: 60663 + 831 = 61494
Step 75: 61494 + 831 = 62325
Step 76: 62325 + 831 = 63156
Step 77: 63156 + 831 = 63987
Step 78: 63987 + 831 = 64818
Step 79: 64818 + 831 = 65649
Step 80: 65649 + 831 = 66480
Step 81: 66480 + 831 = 67311
Step 82: 67311 + 831 = 68142
Step 83: 68142 + 831 = 68973
Step 84: 68973 + 831 = 69804
Step 85: 69804 + 831 = 70635
Step 86: 70635 + 831 = 71466
Step 87: 71466 + 831 = 72297
Step 88: 72297 + 831 = 73128
Step 89: 73128 + 831 = 73959
Step 90: 73959 + 831 = 74790
Step 91: 74790 + 831 = 75621
Step 92: 75621 + 831 = 76452
Step 93: 76452 + 831 = 77283
Step 94: 77283 + 831 = 78114
Step 95: 78114 + 831 = 78945
Step 96: 78945 + 831 = 79776
Step 97: 79776 + 831 = 80607
Step 98: 80607 + 831 = 81438
Step 99: 81438 + 831 = 82269
Step 100: 82269 + 831 = 83100
Step 101: 83100 + 831 = 83931
Step 102: 83931 + 831 = 84762
Step 103: 84762 + 831 = 85593
Step 104: 85593 + 831 = 86424
Step 105: 86424 + 831 = 87255
Step 106: 87255 + 831 = 88086
Step 107: 88086 + 831 = 88917
Step 108: 88917 + 831 = 89748
Step 109: 89748 + 831 = 90579
Step 110: 90579 + 831 = 91410
Step 111: 91410 + 831 = 92241
Step 112: 92241 + 831 = 93072
Step 113: 93072 + 831 = 93903
Step 114: 93903 + 831 = 94734
Step 115: 94734 + 831 = 95565
Step 116: 95565 + 831 = 96396
Step 117: 96396 + 831 = 97227
Step 118: 97227 + 831 = 98058
Step 119: 98058 + 831 = 98889
Step 120: 98889 + 831 = 99720
Step 121: 99720 + 831 = 100551
Step 122: 100551 + 831 = 101382
Step 123: 101382 + 831 = 102213
Step 124: 102213 + 831 = 103044
Step 125: 103044 + 831 = 103875
Step 126: 103875 + 831 = 104706
Step 127: 104706 + 831 = 105537
Step 128: 105537 + 831 = 106368
Step 129: 106368 + 831 = 107199
Step 130: 107199 + 831 = 108030
Step 131: 108030 + 831 = 108861
Step 132: 108861 + 831 = 109692
Step 133: 109692 + 831 = 110523
Step 134: 110523 + 831 = 111354
Step 135: 111354 + 831 = 112185
Step 136: 112185 + 831 = 113016
Step 137: 113016 + 831 = 113847
Step 138: 113847 + 831 = 114678
Step 139: 114678 + 831 = 115509
Step 140: 115509 + 831 = 116340
Step 141: 116340 + 831 = 117171
Step 142: 117171 + 831 = 118002
Step 143: 118002 + 831 = 118833
Step 144: 118833 + 831 = 119664
Step 145: 119664 + 831 = 120495
Step 146: 120495 + 831 = 121326
Step 147: 121326 + 831 = 122157
Step 148: 122157 + 831 = 122988
Step 149: 122988 + 831 = 123819
Step 150: 123819 + 831 = 124650
Step 151: 124650 + 831 = 125481
Step 152: 125481 + 831 = 126312
Step 153: 126312 + 831 = 127143
Step 154: 127143 + 831 = 127974
Step 155: 127974 + 831 = 128805
Step 156: 128805 + 831 = 129636
Step 157: 129636 + 831 = 130467
Step 158: 130467 + 831 = 131298
Step 159: 131298 + 831 = 132129
Step 160: 132129 + 831 = 132960
Step 161: 132960 + 831 = 133791
Step 162: 133791 + 831 = 134622
Step 163: 134622 + 831 = 135453
Step 164: 135453 + 831 = 136284
Step 165: 136284 + 831 = 137115
Step 166: 137115 + 831 = 137946
Step 167: 137946 + 831 = 138777
Step 168: 138777 + 831 = 139608
Step 169: 139608 + 831 = 140439
Step 170: 140439 + 831 = 141270
Step 171: 141270 + 831 = 142101
Step 172: 142101 + 831 = 142932
Step 173: 142932 + 831 = 143763
Step 174: 143763 + 831 = 144594
Step 175: 144594 + 831 = 145425
Step 176: 145425 + 831 = 146256
Step 177: 146256 + 831 = 147087
Step 178: 147087 + 831 = 147918
Step 179: 147918 + 831 = 148749
Step 180: 148749 + 831 = 149580
Step 181: 149580 + 831 = 150411
Step 182: 150411 + 831 = 151242
Step 183: 151242 + 831 = 152073
Step 184: 152073 + 831 = 152904
Step 185: 152904 + 831 = 153735
Step 186: 153735 + 831 = 154566
Step 187: 154566 + 831 = 155397
Step 188: 155397 + 831 = 156228
Step 189: 156228 + 831 = 157059
Step 190: 157059 + 831 = 157890
Step 191: 157890 + 831 = 158721
Step 192: 158721 + 831 = 159552
Step 193: 159552 + 831 = 160383
Step 194: 160383 + 831 = 161214
Step 195: 161214 + 831 = 162045
Step 196: 162045 + 831 = 162876
Step 197: 162876 + 831 = 163707
Step 198: 163707 + 831 = 164538
Step 199: 164538 + 831 = 165369
Step 200: 165369 + 831 = 166200
Step 201: 166200 + 831 = 167031
Step 202: 167031 + 831 = 167862
Step 203: 167862 + 831 = 168693
Step 204: 168693 + 831 = 169524
Step 205: 169524 + 831 = 170355
Step 206: 170355 + 831 = 171186
Step 207: 171186 + 831 = 172017
Step 208: 172017 + 831 = 172848
Step 209: 172848 + 831 = 173679
Step 210: 173679 + 831 = 174510
Step 211: 174510 + 831 = 175341
Step 212: 175341 + 831 = 176172
Step 213: 176172 + 831 = 177003
Step 214: 177003 + 831 = 177834
Step 215: 177834 + 831 = 178665
Step 216: 178665 + 831 = 179496
Step 217: 179496 + 831 = 180327
Step 218: 180327 + 831 = 181158
Step 219: 181158 + 831 = 181989
Step 220: 181989 + 831 = 182820
Step 221: 182820 + 831 = 183651
Step 222: 183651 + 831 = 184482
Step 223: 184482 + 831 = 185313
Step 224: 185313 + 831 = 186144
Step 225: 186144 + 831 = 186975
Step 226: 186975 + 831 = 187806
Step 227: 187806 + 831 = 188637
Step 228: 188637 + 831 = 189468
Step 229: 189468 + 831 = 190299
Step 230: 190299 + 831 = 191130
Step 231: 191130 + 831 = 191961
Step 232: 191961 + 831 = 192792
Step 233: 192792 + 831 = 193623
Step 234: 193623 + 831 = 194454
Step 235: 194454 + 831 = 195285
Step 236: 195285 + 831 = 196116
Step 237: 196116 + 831 = 196947
Step 238: 196947 + 831 = 197778
Step 239: 197778 + 831 = 198609
Step 240: 198609 + 831 = 199440
Step 241: 199440 + 831 = 200271
Step 242: 200271 + 831 = 201102
Step 243: 201102 + 831 = 201933
Step 244: 201933 + 831 = 202764
Step 245: 202764 + 831 = 203595
Step 246: 203595 + 831 = 204426
Step 247: 204426 + 831 = 205257
Step 248: 205257 + 831 = 206088
Step 249: 206088 + 831 = 206919
Step 250: 206919 + 831 = 207750
Step 251: 207750 + 831 = 208581
Step 252: 208581 + 831 = 209412
Step 253: 209412 + 831 = 210243
Step 254: 210243 + 831 = 211074
Step 255: 211074 + 831 = 211905
Step 256: 211905 + 831 = 212736
Step 257: 212736 + 831 = 213567
Step 258: 213567 + 831 = 214398
Step 259: 214398 + 831 = 215229
Step 260: 215229 + 831 = 216060
Step 261: 216060 + 831 = 216891
Step 262: 216891 + 831 = 217722
Step 263: 217722 + 831 = 218553
Step 264: 218553 + 831 = 219384
Step 265: 219384 + 831 = 220215
Step 266: 220215 + 831 = 221046
Step 267: 221046 + 831 = 221877
Step 268: 221877 + 831 = 222708
Step 269: 222708 + 831 = 223539
Step 270: 223539 + 831 = 224370
Step 271: 224370 + 831 = 225201
Step 272: 225201 + 831 = 226032
Step 273: 226032 + 831 = 226863
Step 274: 226863 + 831 = 227694
Step 275: 227694 + 831 = 228525
Step 276: 228525 + 831 = 229356
Step 277: 229356 + 831 = 230187
Step 278: 230187 + 831 = 231018
Step 279: 231018 + 831 = 231849
Step 280: 231849 + 831 = 232680
Step 281: 232680 + 831 = 233511
Step 282: 233511 + 831 = 234342
Step 283: 234342 + 831 = 235173
Step 284: 235173 + 831 = 236004
Step 285: 236004 + 831 = 236835
Step 286: 236835 + 831 = 237666
Step 287: 237666 + 831 = 238497
Step 288: 238497 + 831 = 239328
Step 289: 239328 + 831 = 240159
Step 290: 240159 + 831 = 240990
Step 291: 240990 + 831 = 241821
Step 292: 241821 + 831 = 242652
Step 293: 242652 + 831 = 243483
Step 294: 243483 + 831 = 244314
Step 295: 244314 + 831 = 245145
Step 296: 245145 + 831 = 245976
Step 297: 245976 + 831 = 246807
Step 298: 246807 + 831 = 247638
Step 299: 247638 + 831 = 248469
Step 300: 248469 + 831 = 249300
Step 301: 249300 + 831 = 250131
Step 302: 250131 + 831 = 250962
Step 303: 250962 + 831 = 251793
Step 304: 251793 + 831 = 252624
Step 305: 252624 + 831 = 253455
Step 306: 253455 + 831 = 254286
Step 307: 254286 + 831 = 255117
Step 308: 255117 + 831 = 255948
Step 309: 255948 + 831 = 256779
Step 310: 256779 + 831 = 257610
Step 311: 257610 + 831 = 258441
Step 312: 258441 + 831 = 259272
Step 313: 259272 + 831 = 260103
Step 314: 260103 + 831 = 260934
Step 315: 260934 + 831 = 261765
Step 316: 261765 + 831 = 262596
Step 317: 262596 + 831 = 263427
Step 318: 263427 + 831 = 264258
Step 319: 264258 + 831 = 265089
Step 320: 265089 + 831 = 265920
Step 321: 265920 + 831 = 266751
Step 322: 266751 + 831 = 267582
Step 323: 267582 + 831 = 268413
Step 324: 268413 + 831 = 269244
Step 325: 269244 + 831 = 270075
Step 326: 270075 + 831 = 270906
Step 327: 270906 + 831 = 271737
Step 328: 271737 + 831 = 272568
Step 329: 272568 + 831 = 273399
Step 330: 273399 + 831 = 274230
Step 331: 274230 + 831 = 275061
Step 332: 275061 + 831 = 275892
Step 333: 275892 + 831 = 276723
Step 334: 276723 + 831 = 277554
Step 335: 277554 + 831 = 278385
Step 336: 278385 + 831 = 279216
Step 337: 279216 + 831 = 280047
Step 338: 280047 + 831 = 280878
Step 339: 280878 + 831 = 281709
Step 340: 281709 + 831 = 282540
Step 341: 282540 + 831 = 283371
Step 342: 283371 + 831 = 284202
Step 343: 284202 + 831 = 285033
Step 344: 285033 + 831 = 285864
Step 345: 285864 + 831 = 286695
Step 346: 286695 + 831 = 287526
Step 347: 287526 + 831 = 288357
Step 348: 288357 + 831 = 289188
Step 349: 289188 + 831 = 290019
Step 350: 290019 + 831 = 290850
Step 351: 290850 + 831 = 291681
Step 352: 291681 + 831 = 292512
Step 353: 292512 + 831 = 293343
Step 354: 293343 + 831 = 294174
Step 355: 294174 + 831 = 295005
Step 356: 295005 + 831 = 295836
Step 357: 295836 + 831 = 296667
Step 358: 296667 + 831 = 297498
Step 359: 297498 + 831 = 298329
Step 360: 298329 + 831 = 299160
Step 361: 299160 + 831 = 299991
Step 362: 299991 + 831 = 300822
Step 363: 300822 + 831 = 301653
Step 364: 301653 + 831 = 302484
Step 365: 302484 + 831 = 303315
Step 366: 303315 + 831 = 304146
Step 367: 304146 + 831 = 304977
Step 368: 304977 + 831 = 305808
Step 369: 305808 + 831 = 306639
Step 370: 306639 + 831 = 307470
Step 371: 307470 + 831 = 308301
Step 372: 308301 + 831 = 309132
Step 373: 309132 + 831 = 309963
Step 374: 309963 + 831 = 310794
Step 375: 310794 + 831 = 311625
Step 376: 311625 + 831 = 312456
Step 377: 312456 + 831 = 313287
Step 378: 313287 + 831 = 314118
Step 379: 314118 + 831 = 314949
Step 380: 314949 + 831 = 315780
Step 381: 315780 + 831 = 316611
Step 382: 316611 + 831 = 317442
Step 383: 317442 + 831 = 318273
Step 384: 318273 + 831 = 319104
Step 385: 319104 + 831 = 319935
Step 386: 319935 + 831 = 320766
Step 387: 320766 + 831 = 321597
Step 388: 321597 + 831 = 322428
Step 389: 322428 + 831 = 323259
Step 390: 323259 + 831 = 324090
Step 391: 324090 + 831 = 324921
Step 392: 324921 + 831 = 325752
Step 393: 325752 + 831 = 326583
Step 394: 326583 + 831 = 327414
Step 395: 327414 + 831 = 328245
Step 396: 328245 + 831 = 329076
Step 397: 329076 + 831 = 329907
Step 398: 329907 + 831 = 330738
Step 399: 330738 + 831 = 331569
Step 400: 331569 + 831 = 332400
Step 401: 332400 + 831 = 333231
Step 402: 333231 + 831 = 334062
Step 403: 334062 + 831 = 334893
Step 404: 334893 + 831 = 335724
Step 405: 335724 + 831 = 336555
Step 406: 336555 + 831 = 337386
Step 407: 337386 + 831 = 338217
Step 408: 338217 + 831 = 339048
Step 409: 339048 + 831 = 339879
Step 410: 339879 + 831 = 340710
Step 411: 340710 + 831 = 341541
Step 412: 341541 + 831 = 342372
Step 413: 342372 + 831 = 343203
Step 414: 343203 + 831 = 344034
Step 415: 344034 + 831 = 344865
Step 416: 344865 + 831 = 345696
Step 417: 345696 + 831 = 346527
Step 418: 346527 + 831 = 347358
Step 419: 347358 + 831 = 348189
Step 420: 348189 + 831 = 349020
Step 421: 349020 + 831 = 349851
Step 422: 349851 + 831 = 350682
Step 423: 350682 + 831 = 351513
Step 424: 351513 + 831 = 352344
Step 425: 352344 + 831 = 353175
Step 426: 353175 + 831 = 354006
Step 427: 354006 + 831 = 354837
Step 428: 354837 + 831 = 355668
Step 429: 355668 + 831 = 356499
Step 430: 356499 + 831 = 357330
Step 431: 357330 + 831 = 358161
Step 432: 358161 + 831 = 358992
Step 433: 358992 + 831 = 359823
Step 434: 359823 + 831 = 360654
Step 435: 360654 + 831 = 361485
Step 436: 361485 + 831 = 362316
Step 437: 362316 + 831 = 363147
Step 438: 363147 + 831 = 363978
Step 439: 363978 + 831 = 364809
Step 440: 364809 + 831 = 365640
Step 441: 365640 + 831 = 366471
Step 442: 366471 + 831 = 367302
Step 443: 367302 + 831 = 368133
Step 444: 368133 + 831 = 368964
Step 445: 368964 + 831 = 369795
Step 446: 369795 + 831 = 370626
Step 447: 370626 + 831 = 371457
Step 448: 371457 + 831 = 372288
Step 449: 372288 + 831 = 373119
Step 450: 373119 + 831 = 373950
Step 451: 373950 + 831 = 374781
Step 452: 374781 + 831 = 375612
Step 453: 375612 + 831 = 376443
Step 454: 376443 + 831 = 377274
Step 455: 377274 + 831 = 378105
Step 456: 378105 + 831 = 378936
Step 457: 378936 + 831 = 379767
Step 458: 379767 + 831 = 380598
Step 459: 380598 + 831 = 381429
Step 460: 381429 + 831 = 382260
Step 461: 382260 + 831 = 383091
Step 462: 383091 + 831 = 383922
Step 463: 383922 + 831 = 384753
Step 464: 384753 + 831 = 385584
Step 465: 385584 + 831 = 386415
Step 466: 386415 + 831 = 387246
Step 467: 387246 + 831 = 388077
Step 468: 388077 + 831 = 388908
Step 469: 388908 + 831 = 389739
Step 470: 389739 + 831 = 390570
Step 471: 390570 + 831 = 391401
Step 472: 391401 + 831 = 392232
Step 473: 392232 + 831 = 393063
Step 474: 393063 + 831 = 393894
Step 475: 393894 + 831 = 394725
Step 476: 394725 + 831 = 395556
Step 477: 395556 + 831 = 396387
Step 478: 396387 + 831 = 397218
Step 479: 397218 + 831 = 398049
Step 480: 398049 + 831 = 398880
Step 481: 398880 + 831 = 399711
Step 482: 399711 + 831 = 400542
Step 483: 400542 + 831 = 401373
Step 484: 401373 + 831 = 402204
Step 485: 402204 + 831 = 403035
Step 486: 403035 + 831 = 403866

So, 831*486 = 403866