OK, let's crack this. We're given 854 and our task is to multiply it by 343. Essentially, we'll be adding 854 to itself 343 times.
Step 1: 0 + 854 = 854
Step 2: 854 + 854 = 1708
Step 3: 1708 + 854 = 2562
Step 4: 2562 + 854 = 3416
Step 5: 3416 + 854 = 4270
Step 6: 4270 + 854 = 5124
Step 7: 5124 + 854 = 5978
Step 8: 5978 + 854 = 6832
Step 9: 6832 + 854 = 7686
Step 10: 7686 + 854 = 8540
Step 11: 8540 + 854 = 9394
Step 12: 9394 + 854 = 10248
Step 13: 10248 + 854 = 11102
Step 14: 11102 + 854 = 11956
Step 15: 11956 + 854 = 12810
Step 16: 12810 + 854 = 13664
Step 17: 13664 + 854 = 14518
Step 18: 14518 + 854 = 15372
Step 19: 15372 + 854 = 16226
Step 20: 16226 + 854 = 17080
Step 21: 17080 + 854 = 17934
Step 22: 17934 + 854 = 18788
Step 23: 18788 + 854 = 19642
Step 24: 19642 + 854 = 20496
Step 25: 20496 + 854 = 21350
Step 26: 21350 + 854 = 22204
Step 27: 22204 + 854 = 23058
Step 28: 23058 + 854 = 23912
Step 29: 23912 + 854 = 24766
Step 30: 24766 + 854 = 25620
Step 31: 25620 + 854 = 26474
Step 32: 26474 + 854 = 27328
Step 33: 27328 + 854 = 28182
Step 34: 28182 + 854 = 29036
Step 35: 29036 + 854 = 29890
Step 36: 29890 + 854 = 30744
Step 37: 30744 + 854 = 31598
Step 38: 31598 + 854 = 32452
Step 39: 32452 + 854 = 33306
Step 40: 33306 + 854 = 34160
Step 41: 34160 + 854 = 35014
Step 42: 35014 + 854 = 35868
Step 43: 35868 + 854 = 36722
Step 44: 36722 + 854 = 37576
Step 45: 37576 + 854 = 38430
Step 46: 38430 + 854 = 39284
Step 47: 39284 + 854 = 40138
Step 48: 40138 + 854 = 40992
Step 49: 40992 + 854 = 41846
Step 50: 41846 + 854 = 42700
Step 51: 42700 + 854 = 43554
Step 52: 43554 + 854 = 44408
Step 53: 44408 + 854 = 45262
Step 54: 45262 + 854 = 46116
Step 55: 46116 + 854 = 46970
Step 56: 46970 + 854 = 47824
Step 57: 47824 + 854 = 48678
Step 58: 48678 + 854 = 49532
Step 59: 49532 + 854 = 50386
Step 60: 50386 + 854 = 51240
Step 61: 51240 + 854 = 52094
Step 62: 52094 + 854 = 52948
Step 63: 52948 + 854 = 53802
Step 64: 53802 + 854 = 54656
Step 65: 54656 + 854 = 55510
Step 66: 55510 + 854 = 56364
Step 67: 56364 + 854 = 57218
Step 68: 57218 + 854 = 58072
Step 69: 58072 + 854 = 58926
Step 70: 58926 + 854 = 59780
Step 71: 59780 + 854 = 60634
Step 72: 60634 + 854 = 61488
Step 73: 61488 + 854 = 62342
Step 74: 62342 + 854 = 63196
Step 75: 63196 + 854 = 64050
Step 76: 64050 + 854 = 64904
Step 77: 64904 + 854 = 65758
Step 78: 65758 + 854 = 66612
Step 79: 66612 + 854 = 67466
Step 80: 67466 + 854 = 68320
Step 81: 68320 + 854 = 69174
Step 82: 69174 + 854 = 70028
Step 83: 70028 + 854 = 70882
Step 84: 70882 + 854 = 71736
Step 85: 71736 + 854 = 72590
Step 86: 72590 + 854 = 73444
Step 87: 73444 + 854 = 74298
Step 88: 74298 + 854 = 75152
Step 89: 75152 + 854 = 76006
Step 90: 76006 + 854 = 76860
Step 91: 76860 + 854 = 77714
Step 92: 77714 + 854 = 78568
Step 93: 78568 + 854 = 79422
Step 94: 79422 + 854 = 80276
Step 95: 80276 + 854 = 81130
Step 96: 81130 + 854 = 81984
Step 97: 81984 + 854 = 82838
Step 98: 82838 + 854 = 83692
Step 99: 83692 + 854 = 84546
Step 100: 84546 + 854 = 85400
Step 101: 85400 + 854 = 86254
Step 102: 86254 + 854 = 87108
Step 103: 87108 + 854 = 87962
Step 104: 87962 + 854 = 88816
Step 105: 88816 + 854 = 89670
Step 106: 89670 + 854 = 90524
Step 107: 90524 + 854 = 91378
Step 108: 91378 + 854 = 92232
Step 109: 92232 + 854 = 93086
Step 110: 93086 + 854 = 93940
Step 111: 93940 + 854 = 94794
Step 112: 94794 + 854 = 95648
Step 113: 95648 + 854 = 96502
Step 114: 96502 + 854 = 97356
Step 115: 97356 + 854 = 98210
Step 116: 98210 + 854 = 99064
Step 117: 99064 + 854 = 99918
Step 118: 99918 + 854 = 100772
Step 119: 100772 + 854 = 101626
Step 120: 101626 + 854 = 102480
Step 121: 102480 + 854 = 103334
Step 122: 103334 + 854 = 104188
Step 123: 104188 + 854 = 105042
Step 124: 105042 + 854 = 105896
Step 125: 105896 + 854 = 106750
Step 126: 106750 + 854 = 107604
Step 127: 107604 + 854 = 108458
Step 128: 108458 + 854 = 109312
Step 129: 109312 + 854 = 110166
Step 130: 110166 + 854 = 111020
Step 131: 111020 + 854 = 111874
Step 132: 111874 + 854 = 112728
Step 133: 112728 + 854 = 113582
Step 134: 113582 + 854 = 114436
Step 135: 114436 + 854 = 115290
Step 136: 115290 + 854 = 116144
Step 137: 116144 + 854 = 116998
Step 138: 116998 + 854 = 117852
Step 139: 117852 + 854 = 118706
Step 140: 118706 + 854 = 119560
Step 141: 119560 + 854 = 120414
Step 142: 120414 + 854 = 121268
Step 143: 121268 + 854 = 122122
Step 144: 122122 + 854 = 122976
Step 145: 122976 + 854 = 123830
Step 146: 123830 + 854 = 124684
Step 147: 124684 + 854 = 125538
Step 148: 125538 + 854 = 126392
Step 149: 126392 + 854 = 127246
Step 150: 127246 + 854 = 128100
Step 151: 128100 + 854 = 128954
Step 152: 128954 + 854 = 129808
Step 153: 129808 + 854 = 130662
Step 154: 130662 + 854 = 131516
Step 155: 131516 + 854 = 132370
Step 156: 132370 + 854 = 133224
Step 157: 133224 + 854 = 134078
Step 158: 134078 + 854 = 134932
Step 159: 134932 + 854 = 135786
Step 160: 135786 + 854 = 136640
Step 161: 136640 + 854 = 137494
Step 162: 137494 + 854 = 138348
Step 163: 138348 + 854 = 139202
Step 164: 139202 + 854 = 140056
Step 165: 140056 + 854 = 140910
Step 166: 140910 + 854 = 141764
Step 167: 141764 + 854 = 142618
Step 168: 142618 + 854 = 143472
Step 169: 143472 + 854 = 144326
Step 170: 144326 + 854 = 145180
Step 171: 145180 + 854 = 146034
Step 172: 146034 + 854 = 146888
Step 173: 146888 + 854 = 147742
Step 174: 147742 + 854 = 148596
Step 175: 148596 + 854 = 149450
Step 176: 149450 + 854 = 150304
Step 177: 150304 + 854 = 151158
Step 178: 151158 + 854 = 152012
Step 179: 152012 + 854 = 152866
Step 180: 152866 + 854 = 153720
Step 181: 153720 + 854 = 154574
Step 182: 154574 + 854 = 155428
Step 183: 155428 + 854 = 156282
Step 184: 156282 + 854 = 157136
Step 185: 157136 + 854 = 157990
Step 186: 157990 + 854 = 158844
Step 187: 158844 + 854 = 159698
Step 188: 159698 + 854 = 160552
Step 189: 160552 + 854 = 161406
Step 190: 161406 + 854 = 162260
Step 191: 162260 + 854 = 163114
Step 192: 163114 + 854 = 163968
Step 193: 163968 + 854 = 164822
Step 194: 164822 + 854 = 165676
Step 195: 165676 + 854 = 166530
Step 196: 166530 + 854 = 167384
Step 197: 167384 + 854 = 168238
Step 198: 168238 + 854 = 169092
Step 199: 169092 + 854 = 169946
Step 200: 169946 + 854 = 170800
Step 201: 170800 + 854 = 171654
Step 202: 171654 + 854 = 172508
Step 203: 172508 + 854 = 173362
Step 204: 173362 + 854 = 174216
Step 205: 174216 + 854 = 175070
Step 206: 175070 + 854 = 175924
Step 207: 175924 + 854 = 176778
Step 208: 176778 + 854 = 177632
Step 209: 177632 + 854 = 178486
Step 210: 178486 + 854 = 179340
Step 211: 179340 + 854 = 180194
Step 212: 180194 + 854 = 181048
Step 213: 181048 + 854 = 181902
Step 214: 181902 + 854 = 182756
Step 215: 182756 + 854 = 183610
Step 216: 183610 + 854 = 184464
Step 217: 184464 + 854 = 185318
Step 218: 185318 + 854 = 186172
Step 219: 186172 + 854 = 187026
Step 220: 187026 + 854 = 187880
Step 221: 187880 + 854 = 188734
Step 222: 188734 + 854 = 189588
Step 223: 189588 + 854 = 190442
Step 224: 190442 + 854 = 191296
Step 225: 191296 + 854 = 192150
Step 226: 192150 + 854 = 193004
Step 227: 193004 + 854 = 193858
Step 228: 193858 + 854 = 194712
Step 229: 194712 + 854 = 195566
Step 230: 195566 + 854 = 196420
Step 231: 196420 + 854 = 197274
Step 232: 197274 + 854 = 198128
Step 233: 198128 + 854 = 198982
Step 234: 198982 + 854 = 199836
Step 235: 199836 + 854 = 200690
Step 236: 200690 + 854 = 201544
Step 237: 201544 + 854 = 202398
Step 238: 202398 + 854 = 203252
Step 239: 203252 + 854 = 204106
Step 240: 204106 + 854 = 204960
Step 241: 204960 + 854 = 205814
Step 242: 205814 + 854 = 206668
Step 243: 206668 + 854 = 207522
Step 244: 207522 + 854 = 208376
Step 245: 208376 + 854 = 209230
Step 246: 209230 + 854 = 210084
Step 247: 210084 + 854 = 210938
Step 248: 210938 + 854 = 211792
Step 249: 211792 + 854 = 212646
Step 250: 212646 + 854 = 213500
Step 251: 213500 + 854 = 214354
Step 252: 214354 + 854 = 215208
Step 253: 215208 + 854 = 216062
Step 254: 216062 + 854 = 216916
Step 255: 216916 + 854 = 217770
Step 256: 217770 + 854 = 218624
Step 257: 218624 + 854 = 219478
Step 258: 219478 + 854 = 220332
Step 259: 220332 + 854 = 221186
Step 260: 221186 + 854 = 222040
Step 261: 222040 + 854 = 222894
Step 262: 222894 + 854 = 223748
Step 263: 223748 + 854 = 224602
Step 264: 224602 + 854 = 225456
Step 265: 225456 + 854 = 226310
Step 266: 226310 + 854 = 227164
Step 267: 227164 + 854 = 228018
Step 268: 228018 + 854 = 228872
Step 269: 228872 + 854 = 229726
Step 270: 229726 + 854 = 230580
Step 271: 230580 + 854 = 231434
Step 272: 231434 + 854 = 232288
Step 273: 232288 + 854 = 233142
Step 274: 233142 + 854 = 233996
Step 275: 233996 + 854 = 234850
Step 276: 234850 + 854 = 235704
Step 277: 235704 + 854 = 236558
Step 278: 236558 + 854 = 237412
Step 279: 237412 + 854 = 238266
Step 280: 238266 + 854 = 239120
Step 281: 239120 + 854 = 239974
Step 282: 239974 + 854 = 240828
Step 283: 240828 + 854 = 241682
Step 284: 241682 + 854 = 242536
Step 285: 242536 + 854 = 243390
Step 286: 243390 + 854 = 244244
Step 287: 244244 + 854 = 245098
Step 288: 245098 + 854 = 245952
Step 289: 245952 + 854 = 246806
Step 290: 246806 + 854 = 247660
Step 291: 247660 + 854 = 248514
Step 292: 248514 + 854 = 249368
Step 293: 249368 + 854 = 250222
Step 294: 250222 + 854 = 251076
Step 295: 251076 + 854 = 251930
Step 296: 251930 + 854 = 252784
Step 297: 252784 + 854 = 253638
Step 298: 253638 + 854 = 254492
Step 299: 254492 + 854 = 255346
Step 300: 255346 + 854 = 256200
Step 301: 256200 + 854 = 257054
Step 302: 257054 + 854 = 257908
Step 303: 257908 + 854 = 258762
Step 304: 258762 + 854 = 259616
Step 305: 259616 + 854 = 260470
Step 306: 260470 + 854 = 261324
Step 307: 261324 + 854 = 262178
Step 308: 262178 + 854 = 263032
Step 309: 263032 + 854 = 263886
Step 310: 263886 + 854 = 264740
Step 311: 264740 + 854 = 265594
Step 312: 265594 + 854 = 266448
Step 313: 266448 + 854 = 267302
Step 314: 267302 + 854 = 268156
Step 315: 268156 + 854 = 269010
Step 316: 269010 + 854 = 269864
Step 317: 269864 + 854 = 270718
Step 318: 270718 + 854 = 271572
Step 319: 271572 + 854 = 272426
Step 320: 272426 + 854 = 273280
Step 321: 273280 + 854 = 274134
Step 322: 274134 + 854 = 274988
Step 323: 274988 + 854 = 275842
Step 324: 275842 + 854 = 276696
Step 325: 276696 + 854 = 277550
Step 326: 277550 + 854 = 278404
Step 327: 278404 + 854 = 279258
Step 328: 279258 + 854 = 280112
Step 329: 280112 + 854 = 280966
Step 330: 280966 + 854 = 281820
Step 331: 281820 + 854 = 282674
Step 332: 282674 + 854 = 283528
Step 333: 283528 + 854 = 284382
Step 334: 284382 + 854 = 285236
Step 335: 285236 + 854 = 286090
Step 336: 286090 + 854 = 286944
Step 337: 286944 + 854 = 287798
Step 338: 287798 + 854 = 288652
Step 339: 288652 + 854 = 289506
Step 340: 289506 + 854 = 290360
Step 341: 290360 + 854 = 291214
Step 342: 291214 + 854 = 292068
Step 343: 292068 + 854 = 292922

So, 854*343 = 292922