Alright, let's solve this math problem step by step. First, we have the number 991. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 345. So, we're going to take the number 991 and add it to itself 345 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
Step 344: 339913 + 991 = 340904
Step 345: 340904 + 991 = 341895

So, 991*345 = 341895