OK, let's work through this together. We're starting with 454 and we're going to multiply it by 344, which means we add 454 to itself 344 times.
Step 1: 0 + 454 = 454
Step 2: 454 + 454 = 908
Step 3: 908 + 454 = 1362
Step 4: 1362 + 454 = 1816
Step 5: 1816 + 454 = 2270
Step 6: 2270 + 454 = 2724
Step 7: 2724 + 454 = 3178
Step 8: 3178 + 454 = 3632
Step 9: 3632 + 454 = 4086
Step 10: 4086 + 454 = 4540
Step 11: 4540 + 454 = 4994
Step 12: 4994 + 454 = 5448
Step 13: 5448 + 454 = 5902
Step 14: 5902 + 454 = 6356
Step 15: 6356 + 454 = 6810
Step 16: 6810 + 454 = 7264
Step 17: 7264 + 454 = 7718
Step 18: 7718 + 454 = 8172
Step 19: 8172 + 454 = 8626
Step 20: 8626 + 454 = 9080
Step 21: 9080 + 454 = 9534
Step 22: 9534 + 454 = 9988
Step 23: 9988 + 454 = 10442
Step 24: 10442 + 454 = 10896
Step 25: 10896 + 454 = 11350
Step 26: 11350 + 454 = 11804
Step 27: 11804 + 454 = 12258
Step 28: 12258 + 454 = 12712
Step 29: 12712 + 454 = 13166
Step 30: 13166 + 454 = 13620
Step 31: 13620 + 454 = 14074
Step 32: 14074 + 454 = 14528
Step 33: 14528 + 454 = 14982
Step 34: 14982 + 454 = 15436
Step 35: 15436 + 454 = 15890
Step 36: 15890 + 454 = 16344
Step 37: 16344 + 454 = 16798
Step 38: 16798 + 454 = 17252
Step 39: 17252 + 454 = 17706
Step 40: 17706 + 454 = 18160
Step 41: 18160 + 454 = 18614
Step 42: 18614 + 454 = 19068
Step 43: 19068 + 454 = 19522
Step 44: 19522 + 454 = 19976
Step 45: 19976 + 454 = 20430
Step 46: 20430 + 454 = 20884
Step 47: 20884 + 454 = 21338
Step 48: 21338 + 454 = 21792
Step 49: 21792 + 454 = 22246
Step 50: 22246 + 454 = 22700
Step 51: 22700 + 454 = 23154
Step 52: 23154 + 454 = 23608
Step 53: 23608 + 454 = 24062
Step 54: 24062 + 454 = 24516
Step 55: 24516 + 454 = 24970
Step 56: 24970 + 454 = 25424
Step 57: 25424 + 454 = 25878
Step 58: 25878 + 454 = 26332
Step 59: 26332 + 454 = 26786
Step 60: 26786 + 454 = 27240
Step 61: 27240 + 454 = 27694
Step 62: 27694 + 454 = 28148
Step 63: 28148 + 454 = 28602
Step 64: 28602 + 454 = 29056
Step 65: 29056 + 454 = 29510
Step 66: 29510 + 454 = 29964
Step 67: 29964 + 454 = 30418
Step 68: 30418 + 454 = 30872
Step 69: 30872 + 454 = 31326
Step 70: 31326 + 454 = 31780
Step 71: 31780 + 454 = 32234
Step 72: 32234 + 454 = 32688
Step 73: 32688 + 454 = 33142
Step 74: 33142 + 454 = 33596
Step 75: 33596 + 454 = 34050
Step 76: 34050 + 454 = 34504
Step 77: 34504 + 454 = 34958
Step 78: 34958 + 454 = 35412
Step 79: 35412 + 454 = 35866
Step 80: 35866 + 454 = 36320
Step 81: 36320 + 454 = 36774
Step 82: 36774 + 454 = 37228
Step 83: 37228 + 454 = 37682
Step 84: 37682 + 454 = 38136
Step 85: 38136 + 454 = 38590
Step 86: 38590 + 454 = 39044
Step 87: 39044 + 454 = 39498
Step 88: 39498 + 454 = 39952
Step 89: 39952 + 454 = 40406
Step 90: 40406 + 454 = 40860
Step 91: 40860 + 454 = 41314
Step 92: 41314 + 454 = 41768
Step 93: 41768 + 454 = 42222
Step 94: 42222 + 454 = 42676
Step 95: 42676 + 454 = 43130
Step 96: 43130 + 454 = 43584
Step 97: 43584 + 454 = 44038
Step 98: 44038 + 454 = 44492
Step 99: 44492 + 454 = 44946
Step 100: 44946 + 454 = 45400
Step 101: 45400 + 454 = 45854
Step 102: 45854 + 454 = 46308
Step 103: 46308 + 454 = 46762
Step 104: 46762 + 454 = 47216
Step 105: 47216 + 454 = 47670
Step 106: 47670 + 454 = 48124
Step 107: 48124 + 454 = 48578
Step 108: 48578 + 454 = 49032
Step 109: 49032 + 454 = 49486
Step 110: 49486 + 454 = 49940
Step 111: 49940 + 454 = 50394
Step 112: 50394 + 454 = 50848
Step 113: 50848 + 454 = 51302
Step 114: 51302 + 454 = 51756
Step 115: 51756 + 454 = 52210
Step 116: 52210 + 454 = 52664
Step 117: 52664 + 454 = 53118
Step 118: 53118 + 454 = 53572
Step 119: 53572 + 454 = 54026
Step 120: 54026 + 454 = 54480
Step 121: 54480 + 454 = 54934
Step 122: 54934 + 454 = 55388
Step 123: 55388 + 454 = 55842
Step 124: 55842 + 454 = 56296
Step 125: 56296 + 454 = 56750
Step 126: 56750 + 454 = 57204
Step 127: 57204 + 454 = 57658
Step 128: 57658 + 454 = 58112
Step 129: 58112 + 454 = 58566
Step 130: 58566 + 454 = 59020
Step 131: 59020 + 454 = 59474
Step 132: 59474 + 454 = 59928
Step 133: 59928 + 454 = 60382
Step 134: 60382 + 454 = 60836
Step 135: 60836 + 454 = 61290
Step 136: 61290 + 454 = 61744
Step 137: 61744 + 454 = 62198
Step 138: 62198 + 454 = 62652
Step 139: 62652 + 454 = 63106
Step 140: 63106 + 454 = 63560
Step 141: 63560 + 454 = 64014
Step 142: 64014 + 454 = 64468
Step 143: 64468 + 454 = 64922
Step 144: 64922 + 454 = 65376
Step 145: 65376 + 454 = 65830
Step 146: 65830 + 454 = 66284
Step 147: 66284 + 454 = 66738
Step 148: 66738 + 454 = 67192
Step 149: 67192 + 454 = 67646
Step 150: 67646 + 454 = 68100
Step 151: 68100 + 454 = 68554
Step 152: 68554 + 454 = 69008
Step 153: 69008 + 454 = 69462
Step 154: 69462 + 454 = 69916
Step 155: 69916 + 454 = 70370
Step 156: 70370 + 454 = 70824
Step 157: 70824 + 454 = 71278
Step 158: 71278 + 454 = 71732
Step 159: 71732 + 454 = 72186
Step 160: 72186 + 454 = 72640
Step 161: 72640 + 454 = 73094
Step 162: 73094 + 454 = 73548
Step 163: 73548 + 454 = 74002
Step 164: 74002 + 454 = 74456
Step 165: 74456 + 454 = 74910
Step 166: 74910 + 454 = 75364
Step 167: 75364 + 454 = 75818
Step 168: 75818 + 454 = 76272
Step 169: 76272 + 454 = 76726
Step 170: 76726 + 454 = 77180
Step 171: 77180 + 454 = 77634
Step 172: 77634 + 454 = 78088
Step 173: 78088 + 454 = 78542
Step 174: 78542 + 454 = 78996
Step 175: 78996 + 454 = 79450
Step 176: 79450 + 454 = 79904
Step 177: 79904 + 454 = 80358
Step 178: 80358 + 454 = 80812
Step 179: 80812 + 454 = 81266
Step 180: 81266 + 454 = 81720
Step 181: 81720 + 454 = 82174
Step 182: 82174 + 454 = 82628
Step 183: 82628 + 454 = 83082
Step 184: 83082 + 454 = 83536
Step 185: 83536 + 454 = 83990
Step 186: 83990 + 454 = 84444
Step 187: 84444 + 454 = 84898
Step 188: 84898 + 454 = 85352
Step 189: 85352 + 454 = 85806
Step 190: 85806 + 454 = 86260
Step 191: 86260 + 454 = 86714
Step 192: 86714 + 454 = 87168
Step 193: 87168 + 454 = 87622
Step 194: 87622 + 454 = 88076
Step 195: 88076 + 454 = 88530
Step 196: 88530 + 454 = 88984
Step 197: 88984 + 454 = 89438
Step 198: 89438 + 454 = 89892
Step 199: 89892 + 454 = 90346
Step 200: 90346 + 454 = 90800
Step 201: 90800 + 454 = 91254
Step 202: 91254 + 454 = 91708
Step 203: 91708 + 454 = 92162
Step 204: 92162 + 454 = 92616
Step 205: 92616 + 454 = 93070
Step 206: 93070 + 454 = 93524
Step 207: 93524 + 454 = 93978
Step 208: 93978 + 454 = 94432
Step 209: 94432 + 454 = 94886
Step 210: 94886 + 454 = 95340
Step 211: 95340 + 454 = 95794
Step 212: 95794 + 454 = 96248
Step 213: 96248 + 454 = 96702
Step 214: 96702 + 454 = 97156
Step 215: 97156 + 454 = 97610
Step 216: 97610 + 454 = 98064
Step 217: 98064 + 454 = 98518
Step 218: 98518 + 454 = 98972
Step 219: 98972 + 454 = 99426
Step 220: 99426 + 454 = 99880
Step 221: 99880 + 454 = 100334
Step 222: 100334 + 454 = 100788
Step 223: 100788 + 454 = 101242
Step 224: 101242 + 454 = 101696
Step 225: 101696 + 454 = 102150
Step 226: 102150 + 454 = 102604
Step 227: 102604 + 454 = 103058
Step 228: 103058 + 454 = 103512
Step 229: 103512 + 454 = 103966
Step 230: 103966 + 454 = 104420
Step 231: 104420 + 454 = 104874
Step 232: 104874 + 454 = 105328
Step 233: 105328 + 454 = 105782
Step 234: 105782 + 454 = 106236
Step 235: 106236 + 454 = 106690
Step 236: 106690 + 454 = 107144
Step 237: 107144 + 454 = 107598
Step 238: 107598 + 454 = 108052
Step 239: 108052 + 454 = 108506
Step 240: 108506 + 454 = 108960
Step 241: 108960 + 454 = 109414
Step 242: 109414 + 454 = 109868
Step 243: 109868 + 454 = 110322
Step 244: 110322 + 454 = 110776
Step 245: 110776 + 454 = 111230
Step 246: 111230 + 454 = 111684
Step 247: 111684 + 454 = 112138
Step 248: 112138 + 454 = 112592
Step 249: 112592 + 454 = 113046
Step 250: 113046 + 454 = 113500
Step 251: 113500 + 454 = 113954
Step 252: 113954 + 454 = 114408
Step 253: 114408 + 454 = 114862
Step 254: 114862 + 454 = 115316
Step 255: 115316 + 454 = 115770
Step 256: 115770 + 454 = 116224
Step 257: 116224 + 454 = 116678
Step 258: 116678 + 454 = 117132
Step 259: 117132 + 454 = 117586
Step 260: 117586 + 454 = 118040
Step 261: 118040 + 454 = 118494
Step 262: 118494 + 454 = 118948
Step 263: 118948 + 454 = 119402
Step 264: 119402 + 454 = 119856
Step 265: 119856 + 454 = 120310
Step 266: 120310 + 454 = 120764
Step 267: 120764 + 454 = 121218
Step 268: 121218 + 454 = 121672
Step 269: 121672 + 454 = 122126
Step 270: 122126 + 454 = 122580
Step 271: 122580 + 454 = 123034
Step 272: 123034 + 454 = 123488
Step 273: 123488 + 454 = 123942
Step 274: 123942 + 454 = 124396
Step 275: 124396 + 454 = 124850
Step 276: 124850 + 454 = 125304
Step 277: 125304 + 454 = 125758
Step 278: 125758 + 454 = 126212
Step 279: 126212 + 454 = 126666
Step 280: 126666 + 454 = 127120
Step 281: 127120 + 454 = 127574
Step 282: 127574 + 454 = 128028
Step 283: 128028 + 454 = 128482
Step 284: 128482 + 454 = 128936
Step 285: 128936 + 454 = 129390
Step 286: 129390 + 454 = 129844
Step 287: 129844 + 454 = 130298
Step 288: 130298 + 454 = 130752
Step 289: 130752 + 454 = 131206
Step 290: 131206 + 454 = 131660
Step 291: 131660 + 454 = 132114
Step 292: 132114 + 454 = 132568
Step 293: 132568 + 454 = 133022
Step 294: 133022 + 454 = 133476
Step 295: 133476 + 454 = 133930
Step 296: 133930 + 454 = 134384
Step 297: 134384 + 454 = 134838
Step 298: 134838 + 454 = 135292
Step 299: 135292 + 454 = 135746
Step 300: 135746 + 454 = 136200
Step 301: 136200 + 454 = 136654
Step 302: 136654 + 454 = 137108
Step 303: 137108 + 454 = 137562
Step 304: 137562 + 454 = 138016
Step 305: 138016 + 454 = 138470
Step 306: 138470 + 454 = 138924
Step 307: 138924 + 454 = 139378
Step 308: 139378 + 454 = 139832
Step 309: 139832 + 454 = 140286
Step 310: 140286 + 454 = 140740
Step 311: 140740 + 454 = 141194
Step 312: 141194 + 454 = 141648
Step 313: 141648 + 454 = 142102
Step 314: 142102 + 454 = 142556
Step 315: 142556 + 454 = 143010
Step 316: 143010 + 454 = 143464
Step 317: 143464 + 454 = 143918
Step 318: 143918 + 454 = 144372
Step 319: 144372 + 454 = 144826
Step 320: 144826 + 454 = 145280
Step 321: 145280 + 454 = 145734
Step 322: 145734 + 454 = 146188
Step 323: 146188 + 454 = 146642
Step 324: 146642 + 454 = 147096
Step 325: 147096 + 454 = 147550
Step 326: 147550 + 454 = 148004
Step 327: 148004 + 454 = 148458
Step 328: 148458 + 454 = 148912
Step 329: 148912 + 454 = 149366
Step 330: 149366 + 454 = 149820
Step 331: 149820 + 454 = 150274
Step 332: 150274 + 454 = 150728
Step 333: 150728 + 454 = 151182
Step 334: 151182 + 454 = 151636
Step 335: 151636 + 454 = 152090
Step 336: 152090 + 454 = 152544
Step 337: 152544 + 454 = 152998
Step 338: 152998 + 454 = 153452
Step 339: 153452 + 454 = 153906
Step 340: 153906 + 454 = 154360
Step 341: 154360 + 454 = 154814
Step 342: 154814 + 454 = 155268
Step 343: 155268 + 454 = 155722
Step 344: 155722 + 454 = 156176

So, 454*344 = 156176