Without delay, let's solve this. We've got 812 and we will be multiplying it by 391, that is, adding 812 to itself 391 times.
Step 1: 0 + 812 = 812
Step 2: 812 + 812 = 1624
Step 3: 1624 + 812 = 2436
Step 4: 2436 + 812 = 3248
Step 5: 3248 + 812 = 4060
Step 6: 4060 + 812 = 4872
Step 7: 4872 + 812 = 5684
Step 8: 5684 + 812 = 6496
Step 9: 6496 + 812 = 7308
Step 10: 7308 + 812 = 8120
Step 11: 8120 + 812 = 8932
Step 12: 8932 + 812 = 9744
Step 13: 9744 + 812 = 10556
Step 14: 10556 + 812 = 11368
Step 15: 11368 + 812 = 12180
Step 16: 12180 + 812 = 12992
Step 17: 12992 + 812 = 13804
Step 18: 13804 + 812 = 14616
Step 19: 14616 + 812 = 15428
Step 20: 15428 + 812 = 16240
Step 21: 16240 + 812 = 17052
Step 22: 17052 + 812 = 17864
Step 23: 17864 + 812 = 18676
Step 24: 18676 + 812 = 19488
Step 25: 19488 + 812 = 20300
Step 26: 20300 + 812 = 21112
Step 27: 21112 + 812 = 21924
Step 28: 21924 + 812 = 22736
Step 29: 22736 + 812 = 23548
Step 30: 23548 + 812 = 24360
Step 31: 24360 + 812 = 25172
Step 32: 25172 + 812 = 25984
Step 33: 25984 + 812 = 26796
Step 34: 26796 + 812 = 27608
Step 35: 27608 + 812 = 28420
Step 36: 28420 + 812 = 29232
Step 37: 29232 + 812 = 30044
Step 38: 30044 + 812 = 30856
Step 39: 30856 + 812 = 31668
Step 40: 31668 + 812 = 32480
Step 41: 32480 + 812 = 33292
Step 42: 33292 + 812 = 34104
Step 43: 34104 + 812 = 34916
Step 44: 34916 + 812 = 35728
Step 45: 35728 + 812 = 36540
Step 46: 36540 + 812 = 37352
Step 47: 37352 + 812 = 38164
Step 48: 38164 + 812 = 38976
Step 49: 38976 + 812 = 39788
Step 50: 39788 + 812 = 40600
Step 51: 40600 + 812 = 41412
Step 52: 41412 + 812 = 42224
Step 53: 42224 + 812 = 43036
Step 54: 43036 + 812 = 43848
Step 55: 43848 + 812 = 44660
Step 56: 44660 + 812 = 45472
Step 57: 45472 + 812 = 46284
Step 58: 46284 + 812 = 47096
Step 59: 47096 + 812 = 47908
Step 60: 47908 + 812 = 48720
Step 61: 48720 + 812 = 49532
Step 62: 49532 + 812 = 50344
Step 63: 50344 + 812 = 51156
Step 64: 51156 + 812 = 51968
Step 65: 51968 + 812 = 52780
Step 66: 52780 + 812 = 53592
Step 67: 53592 + 812 = 54404
Step 68: 54404 + 812 = 55216
Step 69: 55216 + 812 = 56028
Step 70: 56028 + 812 = 56840
Step 71: 56840 + 812 = 57652
Step 72: 57652 + 812 = 58464
Step 73: 58464 + 812 = 59276
Step 74: 59276 + 812 = 60088
Step 75: 60088 + 812 = 60900
Step 76: 60900 + 812 = 61712
Step 77: 61712 + 812 = 62524
Step 78: 62524 + 812 = 63336
Step 79: 63336 + 812 = 64148
Step 80: 64148 + 812 = 64960
Step 81: 64960 + 812 = 65772
Step 82: 65772 + 812 = 66584
Step 83: 66584 + 812 = 67396
Step 84: 67396 + 812 = 68208
Step 85: 68208 + 812 = 69020
Step 86: 69020 + 812 = 69832
Step 87: 69832 + 812 = 70644
Step 88: 70644 + 812 = 71456
Step 89: 71456 + 812 = 72268
Step 90: 72268 + 812 = 73080
Step 91: 73080 + 812 = 73892
Step 92: 73892 + 812 = 74704
Step 93: 74704 + 812 = 75516
Step 94: 75516 + 812 = 76328
Step 95: 76328 + 812 = 77140
Step 96: 77140 + 812 = 77952
Step 97: 77952 + 812 = 78764
Step 98: 78764 + 812 = 79576
Step 99: 79576 + 812 = 80388
Step 100: 80388 + 812 = 81200
Step 101: 81200 + 812 = 82012
Step 102: 82012 + 812 = 82824
Step 103: 82824 + 812 = 83636
Step 104: 83636 + 812 = 84448
Step 105: 84448 + 812 = 85260
Step 106: 85260 + 812 = 86072
Step 107: 86072 + 812 = 86884
Step 108: 86884 + 812 = 87696
Step 109: 87696 + 812 = 88508
Step 110: 88508 + 812 = 89320
Step 111: 89320 + 812 = 90132
Step 112: 90132 + 812 = 90944
Step 113: 90944 + 812 = 91756
Step 114: 91756 + 812 = 92568
Step 115: 92568 + 812 = 93380
Step 116: 93380 + 812 = 94192
Step 117: 94192 + 812 = 95004
Step 118: 95004 + 812 = 95816
Step 119: 95816 + 812 = 96628
Step 120: 96628 + 812 = 97440
Step 121: 97440 + 812 = 98252
Step 122: 98252 + 812 = 99064
Step 123: 99064 + 812 = 99876
Step 124: 99876 + 812 = 100688
Step 125: 100688 + 812 = 101500
Step 126: 101500 + 812 = 102312
Step 127: 102312 + 812 = 103124
Step 128: 103124 + 812 = 103936
Step 129: 103936 + 812 = 104748
Step 130: 104748 + 812 = 105560
Step 131: 105560 + 812 = 106372
Step 132: 106372 + 812 = 107184
Step 133: 107184 + 812 = 107996
Step 134: 107996 + 812 = 108808
Step 135: 108808 + 812 = 109620
Step 136: 109620 + 812 = 110432
Step 137: 110432 + 812 = 111244
Step 138: 111244 + 812 = 112056
Step 139: 112056 + 812 = 112868
Step 140: 112868 + 812 = 113680
Step 141: 113680 + 812 = 114492
Step 142: 114492 + 812 = 115304
Step 143: 115304 + 812 = 116116
Step 144: 116116 + 812 = 116928
Step 145: 116928 + 812 = 117740
Step 146: 117740 + 812 = 118552
Step 147: 118552 + 812 = 119364
Step 148: 119364 + 812 = 120176
Step 149: 120176 + 812 = 120988
Step 150: 120988 + 812 = 121800
Step 151: 121800 + 812 = 122612
Step 152: 122612 + 812 = 123424
Step 153: 123424 + 812 = 124236
Step 154: 124236 + 812 = 125048
Step 155: 125048 + 812 = 125860
Step 156: 125860 + 812 = 126672
Step 157: 126672 + 812 = 127484
Step 158: 127484 + 812 = 128296
Step 159: 128296 + 812 = 129108
Step 160: 129108 + 812 = 129920
Step 161: 129920 + 812 = 130732
Step 162: 130732 + 812 = 131544
Step 163: 131544 + 812 = 132356
Step 164: 132356 + 812 = 133168
Step 165: 133168 + 812 = 133980
Step 166: 133980 + 812 = 134792
Step 167: 134792 + 812 = 135604
Step 168: 135604 + 812 = 136416
Step 169: 136416 + 812 = 137228
Step 170: 137228 + 812 = 138040
Step 171: 138040 + 812 = 138852
Step 172: 138852 + 812 = 139664
Step 173: 139664 + 812 = 140476
Step 174: 140476 + 812 = 141288
Step 175: 141288 + 812 = 142100
Step 176: 142100 + 812 = 142912
Step 177: 142912 + 812 = 143724
Step 178: 143724 + 812 = 144536
Step 179: 144536 + 812 = 145348
Step 180: 145348 + 812 = 146160
Step 181: 146160 + 812 = 146972
Step 182: 146972 + 812 = 147784
Step 183: 147784 + 812 = 148596
Step 184: 148596 + 812 = 149408
Step 185: 149408 + 812 = 150220
Step 186: 150220 + 812 = 151032
Step 187: 151032 + 812 = 151844
Step 188: 151844 + 812 = 152656
Step 189: 152656 + 812 = 153468
Step 190: 153468 + 812 = 154280
Step 191: 154280 + 812 = 155092
Step 192: 155092 + 812 = 155904
Step 193: 155904 + 812 = 156716
Step 194: 156716 + 812 = 157528
Step 195: 157528 + 812 = 158340
Step 196: 158340 + 812 = 159152
Step 197: 159152 + 812 = 159964
Step 198: 159964 + 812 = 160776
Step 199: 160776 + 812 = 161588
Step 200: 161588 + 812 = 162400
Step 201: 162400 + 812 = 163212
Step 202: 163212 + 812 = 164024
Step 203: 164024 + 812 = 164836
Step 204: 164836 + 812 = 165648
Step 205: 165648 + 812 = 166460
Step 206: 166460 + 812 = 167272
Step 207: 167272 + 812 = 168084
Step 208: 168084 + 812 = 168896
Step 209: 168896 + 812 = 169708
Step 210: 169708 + 812 = 170520
Step 211: 170520 + 812 = 171332
Step 212: 171332 + 812 = 172144
Step 213: 172144 + 812 = 172956
Step 214: 172956 + 812 = 173768
Step 215: 173768 + 812 = 174580
Step 216: 174580 + 812 = 175392
Step 217: 175392 + 812 = 176204
Step 218: 176204 + 812 = 177016
Step 219: 177016 + 812 = 177828
Step 220: 177828 + 812 = 178640
Step 221: 178640 + 812 = 179452
Step 222: 179452 + 812 = 180264
Step 223: 180264 + 812 = 181076
Step 224: 181076 + 812 = 181888
Step 225: 181888 + 812 = 182700
Step 226: 182700 + 812 = 183512
Step 227: 183512 + 812 = 184324
Step 228: 184324 + 812 = 185136
Step 229: 185136 + 812 = 185948
Step 230: 185948 + 812 = 186760
Step 231: 186760 + 812 = 187572
Step 232: 187572 + 812 = 188384
Step 233: 188384 + 812 = 189196
Step 234: 189196 + 812 = 190008
Step 235: 190008 + 812 = 190820
Step 236: 190820 + 812 = 191632
Step 237: 191632 + 812 = 192444
Step 238: 192444 + 812 = 193256
Step 239: 193256 + 812 = 194068
Step 240: 194068 + 812 = 194880
Step 241: 194880 + 812 = 195692
Step 242: 195692 + 812 = 196504
Step 243: 196504 + 812 = 197316
Step 244: 197316 + 812 = 198128
Step 245: 198128 + 812 = 198940
Step 246: 198940 + 812 = 199752
Step 247: 199752 + 812 = 200564
Step 248: 200564 + 812 = 201376
Step 249: 201376 + 812 = 202188
Step 250: 202188 + 812 = 203000
Step 251: 203000 + 812 = 203812
Step 252: 203812 + 812 = 204624
Step 253: 204624 + 812 = 205436
Step 254: 205436 + 812 = 206248
Step 255: 206248 + 812 = 207060
Step 256: 207060 + 812 = 207872
Step 257: 207872 + 812 = 208684
Step 258: 208684 + 812 = 209496
Step 259: 209496 + 812 = 210308
Step 260: 210308 + 812 = 211120
Step 261: 211120 + 812 = 211932
Step 262: 211932 + 812 = 212744
Step 263: 212744 + 812 = 213556
Step 264: 213556 + 812 = 214368
Step 265: 214368 + 812 = 215180
Step 266: 215180 + 812 = 215992
Step 267: 215992 + 812 = 216804
Step 268: 216804 + 812 = 217616
Step 269: 217616 + 812 = 218428
Step 270: 218428 + 812 = 219240
Step 271: 219240 + 812 = 220052
Step 272: 220052 + 812 = 220864
Step 273: 220864 + 812 = 221676
Step 274: 221676 + 812 = 222488
Step 275: 222488 + 812 = 223300
Step 276: 223300 + 812 = 224112
Step 277: 224112 + 812 = 224924
Step 278: 224924 + 812 = 225736
Step 279: 225736 + 812 = 226548
Step 280: 226548 + 812 = 227360
Step 281: 227360 + 812 = 228172
Step 282: 228172 + 812 = 228984
Step 283: 228984 + 812 = 229796
Step 284: 229796 + 812 = 230608
Step 285: 230608 + 812 = 231420
Step 286: 231420 + 812 = 232232
Step 287: 232232 + 812 = 233044
Step 288: 233044 + 812 = 233856
Step 289: 233856 + 812 = 234668
Step 290: 234668 + 812 = 235480
Step 291: 235480 + 812 = 236292
Step 292: 236292 + 812 = 237104
Step 293: 237104 + 812 = 237916
Step 294: 237916 + 812 = 238728
Step 295: 238728 + 812 = 239540
Step 296: 239540 + 812 = 240352
Step 297: 240352 + 812 = 241164
Step 298: 241164 + 812 = 241976
Step 299: 241976 + 812 = 242788
Step 300: 242788 + 812 = 243600
Step 301: 243600 + 812 = 244412
Step 302: 244412 + 812 = 245224
Step 303: 245224 + 812 = 246036
Step 304: 246036 + 812 = 246848
Step 305: 246848 + 812 = 247660
Step 306: 247660 + 812 = 248472
Step 307: 248472 + 812 = 249284
Step 308: 249284 + 812 = 250096
Step 309: 250096 + 812 = 250908
Step 310: 250908 + 812 = 251720
Step 311: 251720 + 812 = 252532
Step 312: 252532 + 812 = 253344
Step 313: 253344 + 812 = 254156
Step 314: 254156 + 812 = 254968
Step 315: 254968 + 812 = 255780
Step 316: 255780 + 812 = 256592
Step 317: 256592 + 812 = 257404
Step 318: 257404 + 812 = 258216
Step 319: 258216 + 812 = 259028
Step 320: 259028 + 812 = 259840
Step 321: 259840 + 812 = 260652
Step 322: 260652 + 812 = 261464
Step 323: 261464 + 812 = 262276
Step 324: 262276 + 812 = 263088
Step 325: 263088 + 812 = 263900
Step 326: 263900 + 812 = 264712
Step 327: 264712 + 812 = 265524
Step 328: 265524 + 812 = 266336
Step 329: 266336 + 812 = 267148
Step 330: 267148 + 812 = 267960
Step 331: 267960 + 812 = 268772
Step 332: 268772 + 812 = 269584
Step 333: 269584 + 812 = 270396
Step 334: 270396 + 812 = 271208
Step 335: 271208 + 812 = 272020
Step 336: 272020 + 812 = 272832
Step 337: 272832 + 812 = 273644
Step 338: 273644 + 812 = 274456
Step 339: 274456 + 812 = 275268
Step 340: 275268 + 812 = 276080
Step 341: 276080 + 812 = 276892
Step 342: 276892 + 812 = 277704
Step 343: 277704 + 812 = 278516
Step 344: 278516 + 812 = 279328
Step 345: 279328 + 812 = 280140
Step 346: 280140 + 812 = 280952
Step 347: 280952 + 812 = 281764
Step 348: 281764 + 812 = 282576
Step 349: 282576 + 812 = 283388
Step 350: 283388 + 812 = 284200
Step 351: 284200 + 812 = 285012
Step 352: 285012 + 812 = 285824
Step 353: 285824 + 812 = 286636
Step 354: 286636 + 812 = 287448
Step 355: 287448 + 812 = 288260
Step 356: 288260 + 812 = 289072
Step 357: 289072 + 812 = 289884
Step 358: 289884 + 812 = 290696
Step 359: 290696 + 812 = 291508
Step 360: 291508 + 812 = 292320
Step 361: 292320 + 812 = 293132
Step 362: 293132 + 812 = 293944
Step 363: 293944 + 812 = 294756
Step 364: 294756 + 812 = 295568
Step 365: 295568 + 812 = 296380
Step 366: 296380 + 812 = 297192
Step 367: 297192 + 812 = 298004
Step 368: 298004 + 812 = 298816
Step 369: 298816 + 812 = 299628
Step 370: 299628 + 812 = 300440
Step 371: 300440 + 812 = 301252
Step 372: 301252 + 812 = 302064
Step 373: 302064 + 812 = 302876
Step 374: 302876 + 812 = 303688
Step 375: 303688 + 812 = 304500
Step 376: 304500 + 812 = 305312
Step 377: 305312 + 812 = 306124
Step 378: 306124 + 812 = 306936
Step 379: 306936 + 812 = 307748
Step 380: 307748 + 812 = 308560
Step 381: 308560 + 812 = 309372
Step 382: 309372 + 812 = 310184
Step 383: 310184 + 812 = 310996
Step 384: 310996 + 812 = 311808
Step 385: 311808 + 812 = 312620
Step 386: 312620 + 812 = 313432
Step 387: 313432 + 812 = 314244
Step 388: 314244 + 812 = 315056
Step 389: 315056 + 812 = 315868
Step 390: 315868 + 812 = 316680
Step 391: 316680 + 812 = 317492

So, 812*391 = 317492