Without delay, let's solve this. We've got 991 and we will be multiplying it by 343, that is, adding 991 to itself 343 times.
Step 1: 0 + 991 = 991
Step 2: 991 + 991 = 1982
Step 3: 1982 + 991 = 2973
Step 4: 2973 + 991 = 3964
Step 5: 3964 + 991 = 4955
Step 6: 4955 + 991 = 5946
Step 7: 5946 + 991 = 6937
Step 8: 6937 + 991 = 7928
Step 9: 7928 + 991 = 8919
Step 10: 8919 + 991 = 9910
Step 11: 9910 + 991 = 10901
Step 12: 10901 + 991 = 11892
Step 13: 11892 + 991 = 12883
Step 14: 12883 + 991 = 13874
Step 15: 13874 + 991 = 14865
Step 16: 14865 + 991 = 15856
Step 17: 15856 + 991 = 16847
Step 18: 16847 + 991 = 17838
Step 19: 17838 + 991 = 18829
Step 20: 18829 + 991 = 19820
Step 21: 19820 + 991 = 20811
Step 22: 20811 + 991 = 21802
Step 23: 21802 + 991 = 22793
Step 24: 22793 + 991 = 23784
Step 25: 23784 + 991 = 24775
Step 26: 24775 + 991 = 25766
Step 27: 25766 + 991 = 26757
Step 28: 26757 + 991 = 27748
Step 29: 27748 + 991 = 28739
Step 30: 28739 + 991 = 29730
Step 31: 29730 + 991 = 30721
Step 32: 30721 + 991 = 31712
Step 33: 31712 + 991 = 32703
Step 34: 32703 + 991 = 33694
Step 35: 33694 + 991 = 34685
Step 36: 34685 + 991 = 35676
Step 37: 35676 + 991 = 36667
Step 38: 36667 + 991 = 37658
Step 39: 37658 + 991 = 38649
Step 40: 38649 + 991 = 39640
Step 41: 39640 + 991 = 40631
Step 42: 40631 + 991 = 41622
Step 43: 41622 + 991 = 42613
Step 44: 42613 + 991 = 43604
Step 45: 43604 + 991 = 44595
Step 46: 44595 + 991 = 45586
Step 47: 45586 + 991 = 46577
Step 48: 46577 + 991 = 47568
Step 49: 47568 + 991 = 48559
Step 50: 48559 + 991 = 49550
Step 51: 49550 + 991 = 50541
Step 52: 50541 + 991 = 51532
Step 53: 51532 + 991 = 52523
Step 54: 52523 + 991 = 53514
Step 55: 53514 + 991 = 54505
Step 56: 54505 + 991 = 55496
Step 57: 55496 + 991 = 56487
Step 58: 56487 + 991 = 57478
Step 59: 57478 + 991 = 58469
Step 60: 58469 + 991 = 59460
Step 61: 59460 + 991 = 60451
Step 62: 60451 + 991 = 61442
Step 63: 61442 + 991 = 62433
Step 64: 62433 + 991 = 63424
Step 65: 63424 + 991 = 64415
Step 66: 64415 + 991 = 65406
Step 67: 65406 + 991 = 66397
Step 68: 66397 + 991 = 67388
Step 69: 67388 + 991 = 68379
Step 70: 68379 + 991 = 69370
Step 71: 69370 + 991 = 70361
Step 72: 70361 + 991 = 71352
Step 73: 71352 + 991 = 72343
Step 74: 72343 + 991 = 73334
Step 75: 73334 + 991 = 74325
Step 76: 74325 + 991 = 75316
Step 77: 75316 + 991 = 76307
Step 78: 76307 + 991 = 77298
Step 79: 77298 + 991 = 78289
Step 80: 78289 + 991 = 79280
Step 81: 79280 + 991 = 80271
Step 82: 80271 + 991 = 81262
Step 83: 81262 + 991 = 82253
Step 84: 82253 + 991 = 83244
Step 85: 83244 + 991 = 84235
Step 86: 84235 + 991 = 85226
Step 87: 85226 + 991 = 86217
Step 88: 86217 + 991 = 87208
Step 89: 87208 + 991 = 88199
Step 90: 88199 + 991 = 89190
Step 91: 89190 + 991 = 90181
Step 92: 90181 + 991 = 91172
Step 93: 91172 + 991 = 92163
Step 94: 92163 + 991 = 93154
Step 95: 93154 + 991 = 94145
Step 96: 94145 + 991 = 95136
Step 97: 95136 + 991 = 96127
Step 98: 96127 + 991 = 97118
Step 99: 97118 + 991 = 98109
Step 100: 98109 + 991 = 99100
Step 101: 99100 + 991 = 100091
Step 102: 100091 + 991 = 101082
Step 103: 101082 + 991 = 102073
Step 104: 102073 + 991 = 103064
Step 105: 103064 + 991 = 104055
Step 106: 104055 + 991 = 105046
Step 107: 105046 + 991 = 106037
Step 108: 106037 + 991 = 107028
Step 109: 107028 + 991 = 108019
Step 110: 108019 + 991 = 109010
Step 111: 109010 + 991 = 110001
Step 112: 110001 + 991 = 110992
Step 113: 110992 + 991 = 111983
Step 114: 111983 + 991 = 112974
Step 115: 112974 + 991 = 113965
Step 116: 113965 + 991 = 114956
Step 117: 114956 + 991 = 115947
Step 118: 115947 + 991 = 116938
Step 119: 116938 + 991 = 117929
Step 120: 117929 + 991 = 118920
Step 121: 118920 + 991 = 119911
Step 122: 119911 + 991 = 120902
Step 123: 120902 + 991 = 121893
Step 124: 121893 + 991 = 122884
Step 125: 122884 + 991 = 123875
Step 126: 123875 + 991 = 124866
Step 127: 124866 + 991 = 125857
Step 128: 125857 + 991 = 126848
Step 129: 126848 + 991 = 127839
Step 130: 127839 + 991 = 128830
Step 131: 128830 + 991 = 129821
Step 132: 129821 + 991 = 130812
Step 133: 130812 + 991 = 131803
Step 134: 131803 + 991 = 132794
Step 135: 132794 + 991 = 133785
Step 136: 133785 + 991 = 134776
Step 137: 134776 + 991 = 135767
Step 138: 135767 + 991 = 136758
Step 139: 136758 + 991 = 137749
Step 140: 137749 + 991 = 138740
Step 141: 138740 + 991 = 139731
Step 142: 139731 + 991 = 140722
Step 143: 140722 + 991 = 141713
Step 144: 141713 + 991 = 142704
Step 145: 142704 + 991 = 143695
Step 146: 143695 + 991 = 144686
Step 147: 144686 + 991 = 145677
Step 148: 145677 + 991 = 146668
Step 149: 146668 + 991 = 147659
Step 150: 147659 + 991 = 148650
Step 151: 148650 + 991 = 149641
Step 152: 149641 + 991 = 150632
Step 153: 150632 + 991 = 151623
Step 154: 151623 + 991 = 152614
Step 155: 152614 + 991 = 153605
Step 156: 153605 + 991 = 154596
Step 157: 154596 + 991 = 155587
Step 158: 155587 + 991 = 156578
Step 159: 156578 + 991 = 157569
Step 160: 157569 + 991 = 158560
Step 161: 158560 + 991 = 159551
Step 162: 159551 + 991 = 160542
Step 163: 160542 + 991 = 161533
Step 164: 161533 + 991 = 162524
Step 165: 162524 + 991 = 163515
Step 166: 163515 + 991 = 164506
Step 167: 164506 + 991 = 165497
Step 168: 165497 + 991 = 166488
Step 169: 166488 + 991 = 167479
Step 170: 167479 + 991 = 168470
Step 171: 168470 + 991 = 169461
Step 172: 169461 + 991 = 170452
Step 173: 170452 + 991 = 171443
Step 174: 171443 + 991 = 172434
Step 175: 172434 + 991 = 173425
Step 176: 173425 + 991 = 174416
Step 177: 174416 + 991 = 175407
Step 178: 175407 + 991 = 176398
Step 179: 176398 + 991 = 177389
Step 180: 177389 + 991 = 178380
Step 181: 178380 + 991 = 179371
Step 182: 179371 + 991 = 180362
Step 183: 180362 + 991 = 181353
Step 184: 181353 + 991 = 182344
Step 185: 182344 + 991 = 183335
Step 186: 183335 + 991 = 184326
Step 187: 184326 + 991 = 185317
Step 188: 185317 + 991 = 186308
Step 189: 186308 + 991 = 187299
Step 190: 187299 + 991 = 188290
Step 191: 188290 + 991 = 189281
Step 192: 189281 + 991 = 190272
Step 193: 190272 + 991 = 191263
Step 194: 191263 + 991 = 192254
Step 195: 192254 + 991 = 193245
Step 196: 193245 + 991 = 194236
Step 197: 194236 + 991 = 195227
Step 198: 195227 + 991 = 196218
Step 199: 196218 + 991 = 197209
Step 200: 197209 + 991 = 198200
Step 201: 198200 + 991 = 199191
Step 202: 199191 + 991 = 200182
Step 203: 200182 + 991 = 201173
Step 204: 201173 + 991 = 202164
Step 205: 202164 + 991 = 203155
Step 206: 203155 + 991 = 204146
Step 207: 204146 + 991 = 205137
Step 208: 205137 + 991 = 206128
Step 209: 206128 + 991 = 207119
Step 210: 207119 + 991 = 208110
Step 211: 208110 + 991 = 209101
Step 212: 209101 + 991 = 210092
Step 213: 210092 + 991 = 211083
Step 214: 211083 + 991 = 212074
Step 215: 212074 + 991 = 213065
Step 216: 213065 + 991 = 214056
Step 217: 214056 + 991 = 215047
Step 218: 215047 + 991 = 216038
Step 219: 216038 + 991 = 217029
Step 220: 217029 + 991 = 218020
Step 221: 218020 + 991 = 219011
Step 222: 219011 + 991 = 220002
Step 223: 220002 + 991 = 220993
Step 224: 220993 + 991 = 221984
Step 225: 221984 + 991 = 222975
Step 226: 222975 + 991 = 223966
Step 227: 223966 + 991 = 224957
Step 228: 224957 + 991 = 225948
Step 229: 225948 + 991 = 226939
Step 230: 226939 + 991 = 227930
Step 231: 227930 + 991 = 228921
Step 232: 228921 + 991 = 229912
Step 233: 229912 + 991 = 230903
Step 234: 230903 + 991 = 231894
Step 235: 231894 + 991 = 232885
Step 236: 232885 + 991 = 233876
Step 237: 233876 + 991 = 234867
Step 238: 234867 + 991 = 235858
Step 239: 235858 + 991 = 236849
Step 240: 236849 + 991 = 237840
Step 241: 237840 + 991 = 238831
Step 242: 238831 + 991 = 239822
Step 243: 239822 + 991 = 240813
Step 244: 240813 + 991 = 241804
Step 245: 241804 + 991 = 242795
Step 246: 242795 + 991 = 243786
Step 247: 243786 + 991 = 244777
Step 248: 244777 + 991 = 245768
Step 249: 245768 + 991 = 246759
Step 250: 246759 + 991 = 247750
Step 251: 247750 + 991 = 248741
Step 252: 248741 + 991 = 249732
Step 253: 249732 + 991 = 250723
Step 254: 250723 + 991 = 251714
Step 255: 251714 + 991 = 252705
Step 256: 252705 + 991 = 253696
Step 257: 253696 + 991 = 254687
Step 258: 254687 + 991 = 255678
Step 259: 255678 + 991 = 256669
Step 260: 256669 + 991 = 257660
Step 261: 257660 + 991 = 258651
Step 262: 258651 + 991 = 259642
Step 263: 259642 + 991 = 260633
Step 264: 260633 + 991 = 261624
Step 265: 261624 + 991 = 262615
Step 266: 262615 + 991 = 263606
Step 267: 263606 + 991 = 264597
Step 268: 264597 + 991 = 265588
Step 269: 265588 + 991 = 266579
Step 270: 266579 + 991 = 267570
Step 271: 267570 + 991 = 268561
Step 272: 268561 + 991 = 269552
Step 273: 269552 + 991 = 270543
Step 274: 270543 + 991 = 271534
Step 275: 271534 + 991 = 272525
Step 276: 272525 + 991 = 273516
Step 277: 273516 + 991 = 274507
Step 278: 274507 + 991 = 275498
Step 279: 275498 + 991 = 276489
Step 280: 276489 + 991 = 277480
Step 281: 277480 + 991 = 278471
Step 282: 278471 + 991 = 279462
Step 283: 279462 + 991 = 280453
Step 284: 280453 + 991 = 281444
Step 285: 281444 + 991 = 282435
Step 286: 282435 + 991 = 283426
Step 287: 283426 + 991 = 284417
Step 288: 284417 + 991 = 285408
Step 289: 285408 + 991 = 286399
Step 290: 286399 + 991 = 287390
Step 291: 287390 + 991 = 288381
Step 292: 288381 + 991 = 289372
Step 293: 289372 + 991 = 290363
Step 294: 290363 + 991 = 291354
Step 295: 291354 + 991 = 292345
Step 296: 292345 + 991 = 293336
Step 297: 293336 + 991 = 294327
Step 298: 294327 + 991 = 295318
Step 299: 295318 + 991 = 296309
Step 300: 296309 + 991 = 297300
Step 301: 297300 + 991 = 298291
Step 302: 298291 + 991 = 299282
Step 303: 299282 + 991 = 300273
Step 304: 300273 + 991 = 301264
Step 305: 301264 + 991 = 302255
Step 306: 302255 + 991 = 303246
Step 307: 303246 + 991 = 304237
Step 308: 304237 + 991 = 305228
Step 309: 305228 + 991 = 306219
Step 310: 306219 + 991 = 307210
Step 311: 307210 + 991 = 308201
Step 312: 308201 + 991 = 309192
Step 313: 309192 + 991 = 310183
Step 314: 310183 + 991 = 311174
Step 315: 311174 + 991 = 312165
Step 316: 312165 + 991 = 313156
Step 317: 313156 + 991 = 314147
Step 318: 314147 + 991 = 315138
Step 319: 315138 + 991 = 316129
Step 320: 316129 + 991 = 317120
Step 321: 317120 + 991 = 318111
Step 322: 318111 + 991 = 319102
Step 323: 319102 + 991 = 320093
Step 324: 320093 + 991 = 321084
Step 325: 321084 + 991 = 322075
Step 326: 322075 + 991 = 323066
Step 327: 323066 + 991 = 324057
Step 328: 324057 + 991 = 325048
Step 329: 325048 + 991 = 326039
Step 330: 326039 + 991 = 327030
Step 331: 327030 + 991 = 328021
Step 332: 328021 + 991 = 329012
Step 333: 329012 + 991 = 330003
Step 334: 330003 + 991 = 330994
Step 335: 330994 + 991 = 331985
Step 336: 331985 + 991 = 332976
Step 337: 332976 + 991 = 333967
Step 338: 333967 + 991 = 334958
Step 339: 334958 + 991 = 335949
Step 340: 335949 + 991 = 336940
Step 341: 336940 + 991 = 337931
Step 342: 337931 + 991 = 338922
Step 343: 338922 + 991 = 339913

So, 991*343 = 339913