OK, let's work through this together. We're starting with 403 and we're going to multiply it by 438, which means we add 403 to itself 438 times.
Step 1: 0 + 403 = 403
Step 2: 403 + 403 = 806
Step 3: 806 + 403 = 1209
Step 4: 1209 + 403 = 1612
Step 5: 1612 + 403 = 2015
Step 6: 2015 + 403 = 2418
Step 7: 2418 + 403 = 2821
Step 8: 2821 + 403 = 3224
Step 9: 3224 + 403 = 3627
Step 10: 3627 + 403 = 4030
Step 11: 4030 + 403 = 4433
Step 12: 4433 + 403 = 4836
Step 13: 4836 + 403 = 5239
Step 14: 5239 + 403 = 5642
Step 15: 5642 + 403 = 6045
Step 16: 6045 + 403 = 6448
Step 17: 6448 + 403 = 6851
Step 18: 6851 + 403 = 7254
Step 19: 7254 + 403 = 7657
Step 20: 7657 + 403 = 8060
Step 21: 8060 + 403 = 8463
Step 22: 8463 + 403 = 8866
Step 23: 8866 + 403 = 9269
Step 24: 9269 + 403 = 9672
Step 25: 9672 + 403 = 10075
Step 26: 10075 + 403 = 10478
Step 27: 10478 + 403 = 10881
Step 28: 10881 + 403 = 11284
Step 29: 11284 + 403 = 11687
Step 30: 11687 + 403 = 12090
Step 31: 12090 + 403 = 12493
Step 32: 12493 + 403 = 12896
Step 33: 12896 + 403 = 13299
Step 34: 13299 + 403 = 13702
Step 35: 13702 + 403 = 14105
Step 36: 14105 + 403 = 14508
Step 37: 14508 + 403 = 14911
Step 38: 14911 + 403 = 15314
Step 39: 15314 + 403 = 15717
Step 40: 15717 + 403 = 16120
Step 41: 16120 + 403 = 16523
Step 42: 16523 + 403 = 16926
Step 43: 16926 + 403 = 17329
Step 44: 17329 + 403 = 17732
Step 45: 17732 + 403 = 18135
Step 46: 18135 + 403 = 18538
Step 47: 18538 + 403 = 18941
Step 48: 18941 + 403 = 19344
Step 49: 19344 + 403 = 19747
Step 50: 19747 + 403 = 20150
Step 51: 20150 + 403 = 20553
Step 52: 20553 + 403 = 20956
Step 53: 20956 + 403 = 21359
Step 54: 21359 + 403 = 21762
Step 55: 21762 + 403 = 22165
Step 56: 22165 + 403 = 22568
Step 57: 22568 + 403 = 22971
Step 58: 22971 + 403 = 23374
Step 59: 23374 + 403 = 23777
Step 60: 23777 + 403 = 24180
Step 61: 24180 + 403 = 24583
Step 62: 24583 + 403 = 24986
Step 63: 24986 + 403 = 25389
Step 64: 25389 + 403 = 25792
Step 65: 25792 + 403 = 26195
Step 66: 26195 + 403 = 26598
Step 67: 26598 + 403 = 27001
Step 68: 27001 + 403 = 27404
Step 69: 27404 + 403 = 27807
Step 70: 27807 + 403 = 28210
Step 71: 28210 + 403 = 28613
Step 72: 28613 + 403 = 29016
Step 73: 29016 + 403 = 29419
Step 74: 29419 + 403 = 29822
Step 75: 29822 + 403 = 30225
Step 76: 30225 + 403 = 30628
Step 77: 30628 + 403 = 31031
Step 78: 31031 + 403 = 31434
Step 79: 31434 + 403 = 31837
Step 80: 31837 + 403 = 32240
Step 81: 32240 + 403 = 32643
Step 82: 32643 + 403 = 33046
Step 83: 33046 + 403 = 33449
Step 84: 33449 + 403 = 33852
Step 85: 33852 + 403 = 34255
Step 86: 34255 + 403 = 34658
Step 87: 34658 + 403 = 35061
Step 88: 35061 + 403 = 35464
Step 89: 35464 + 403 = 35867
Step 90: 35867 + 403 = 36270
Step 91: 36270 + 403 = 36673
Step 92: 36673 + 403 = 37076
Step 93: 37076 + 403 = 37479
Step 94: 37479 + 403 = 37882
Step 95: 37882 + 403 = 38285
Step 96: 38285 + 403 = 38688
Step 97: 38688 + 403 = 39091
Step 98: 39091 + 403 = 39494
Step 99: 39494 + 403 = 39897
Step 100: 39897 + 403 = 40300
Step 101: 40300 + 403 = 40703
Step 102: 40703 + 403 = 41106
Step 103: 41106 + 403 = 41509
Step 104: 41509 + 403 = 41912
Step 105: 41912 + 403 = 42315
Step 106: 42315 + 403 = 42718
Step 107: 42718 + 403 = 43121
Step 108: 43121 + 403 = 43524
Step 109: 43524 + 403 = 43927
Step 110: 43927 + 403 = 44330
Step 111: 44330 + 403 = 44733
Step 112: 44733 + 403 = 45136
Step 113: 45136 + 403 = 45539
Step 114: 45539 + 403 = 45942
Step 115: 45942 + 403 = 46345
Step 116: 46345 + 403 = 46748
Step 117: 46748 + 403 = 47151
Step 118: 47151 + 403 = 47554
Step 119: 47554 + 403 = 47957
Step 120: 47957 + 403 = 48360
Step 121: 48360 + 403 = 48763
Step 122: 48763 + 403 = 49166
Step 123: 49166 + 403 = 49569
Step 124: 49569 + 403 = 49972
Step 125: 49972 + 403 = 50375
Step 126: 50375 + 403 = 50778
Step 127: 50778 + 403 = 51181
Step 128: 51181 + 403 = 51584
Step 129: 51584 + 403 = 51987
Step 130: 51987 + 403 = 52390
Step 131: 52390 + 403 = 52793
Step 132: 52793 + 403 = 53196
Step 133: 53196 + 403 = 53599
Step 134: 53599 + 403 = 54002
Step 135: 54002 + 403 = 54405
Step 136: 54405 + 403 = 54808
Step 137: 54808 + 403 = 55211
Step 138: 55211 + 403 = 55614
Step 139: 55614 + 403 = 56017
Step 140: 56017 + 403 = 56420
Step 141: 56420 + 403 = 56823
Step 142: 56823 + 403 = 57226
Step 143: 57226 + 403 = 57629
Step 144: 57629 + 403 = 58032
Step 145: 58032 + 403 = 58435
Step 146: 58435 + 403 = 58838
Step 147: 58838 + 403 = 59241
Step 148: 59241 + 403 = 59644
Step 149: 59644 + 403 = 60047
Step 150: 60047 + 403 = 60450
Step 151: 60450 + 403 = 60853
Step 152: 60853 + 403 = 61256
Step 153: 61256 + 403 = 61659
Step 154: 61659 + 403 = 62062
Step 155: 62062 + 403 = 62465
Step 156: 62465 + 403 = 62868
Step 157: 62868 + 403 = 63271
Step 158: 63271 + 403 = 63674
Step 159: 63674 + 403 = 64077
Step 160: 64077 + 403 = 64480
Step 161: 64480 + 403 = 64883
Step 162: 64883 + 403 = 65286
Step 163: 65286 + 403 = 65689
Step 164: 65689 + 403 = 66092
Step 165: 66092 + 403 = 66495
Step 166: 66495 + 403 = 66898
Step 167: 66898 + 403 = 67301
Step 168: 67301 + 403 = 67704
Step 169: 67704 + 403 = 68107
Step 170: 68107 + 403 = 68510
Step 171: 68510 + 403 = 68913
Step 172: 68913 + 403 = 69316
Step 173: 69316 + 403 = 69719
Step 174: 69719 + 403 = 70122
Step 175: 70122 + 403 = 70525
Step 176: 70525 + 403 = 70928
Step 177: 70928 + 403 = 71331
Step 178: 71331 + 403 = 71734
Step 179: 71734 + 403 = 72137
Step 180: 72137 + 403 = 72540
Step 181: 72540 + 403 = 72943
Step 182: 72943 + 403 = 73346
Step 183: 73346 + 403 = 73749
Step 184: 73749 + 403 = 74152
Step 185: 74152 + 403 = 74555
Step 186: 74555 + 403 = 74958
Step 187: 74958 + 403 = 75361
Step 188: 75361 + 403 = 75764
Step 189: 75764 + 403 = 76167
Step 190: 76167 + 403 = 76570
Step 191: 76570 + 403 = 76973
Step 192: 76973 + 403 = 77376
Step 193: 77376 + 403 = 77779
Step 194: 77779 + 403 = 78182
Step 195: 78182 + 403 = 78585
Step 196: 78585 + 403 = 78988
Step 197: 78988 + 403 = 79391
Step 198: 79391 + 403 = 79794
Step 199: 79794 + 403 = 80197
Step 200: 80197 + 403 = 80600
Step 201: 80600 + 403 = 81003
Step 202: 81003 + 403 = 81406
Step 203: 81406 + 403 = 81809
Step 204: 81809 + 403 = 82212
Step 205: 82212 + 403 = 82615
Step 206: 82615 + 403 = 83018
Step 207: 83018 + 403 = 83421
Step 208: 83421 + 403 = 83824
Step 209: 83824 + 403 = 84227
Step 210: 84227 + 403 = 84630
Step 211: 84630 + 403 = 85033
Step 212: 85033 + 403 = 85436
Step 213: 85436 + 403 = 85839
Step 214: 85839 + 403 = 86242
Step 215: 86242 + 403 = 86645
Step 216: 86645 + 403 = 87048
Step 217: 87048 + 403 = 87451
Step 218: 87451 + 403 = 87854
Step 219: 87854 + 403 = 88257
Step 220: 88257 + 403 = 88660
Step 221: 88660 + 403 = 89063
Step 222: 89063 + 403 = 89466
Step 223: 89466 + 403 = 89869
Step 224: 89869 + 403 = 90272
Step 225: 90272 + 403 = 90675
Step 226: 90675 + 403 = 91078
Step 227: 91078 + 403 = 91481
Step 228: 91481 + 403 = 91884
Step 229: 91884 + 403 = 92287
Step 230: 92287 + 403 = 92690
Step 231: 92690 + 403 = 93093
Step 232: 93093 + 403 = 93496
Step 233: 93496 + 403 = 93899
Step 234: 93899 + 403 = 94302
Step 235: 94302 + 403 = 94705
Step 236: 94705 + 403 = 95108
Step 237: 95108 + 403 = 95511
Step 238: 95511 + 403 = 95914
Step 239: 95914 + 403 = 96317
Step 240: 96317 + 403 = 96720
Step 241: 96720 + 403 = 97123
Step 242: 97123 + 403 = 97526
Step 243: 97526 + 403 = 97929
Step 244: 97929 + 403 = 98332
Step 245: 98332 + 403 = 98735
Step 246: 98735 + 403 = 99138
Step 247: 99138 + 403 = 99541
Step 248: 99541 + 403 = 99944
Step 249: 99944 + 403 = 100347
Step 250: 100347 + 403 = 100750
Step 251: 100750 + 403 = 101153
Step 252: 101153 + 403 = 101556
Step 253: 101556 + 403 = 101959
Step 254: 101959 + 403 = 102362
Step 255: 102362 + 403 = 102765
Step 256: 102765 + 403 = 103168
Step 257: 103168 + 403 = 103571
Step 258: 103571 + 403 = 103974
Step 259: 103974 + 403 = 104377
Step 260: 104377 + 403 = 104780
Step 261: 104780 + 403 = 105183
Step 262: 105183 + 403 = 105586
Step 263: 105586 + 403 = 105989
Step 264: 105989 + 403 = 106392
Step 265: 106392 + 403 = 106795
Step 266: 106795 + 403 = 107198
Step 267: 107198 + 403 = 107601
Step 268: 107601 + 403 = 108004
Step 269: 108004 + 403 = 108407
Step 270: 108407 + 403 = 108810
Step 271: 108810 + 403 = 109213
Step 272: 109213 + 403 = 109616
Step 273: 109616 + 403 = 110019
Step 274: 110019 + 403 = 110422
Step 275: 110422 + 403 = 110825
Step 276: 110825 + 403 = 111228
Step 277: 111228 + 403 = 111631
Step 278: 111631 + 403 = 112034
Step 279: 112034 + 403 = 112437
Step 280: 112437 + 403 = 112840
Step 281: 112840 + 403 = 113243
Step 282: 113243 + 403 = 113646
Step 283: 113646 + 403 = 114049
Step 284: 114049 + 403 = 114452
Step 285: 114452 + 403 = 114855
Step 286: 114855 + 403 = 115258
Step 287: 115258 + 403 = 115661
Step 288: 115661 + 403 = 116064
Step 289: 116064 + 403 = 116467
Step 290: 116467 + 403 = 116870
Step 291: 116870 + 403 = 117273
Step 292: 117273 + 403 = 117676
Step 293: 117676 + 403 = 118079
Step 294: 118079 + 403 = 118482
Step 295: 118482 + 403 = 118885
Step 296: 118885 + 403 = 119288
Step 297: 119288 + 403 = 119691
Step 298: 119691 + 403 = 120094
Step 299: 120094 + 403 = 120497
Step 300: 120497 + 403 = 120900
Step 301: 120900 + 403 = 121303
Step 302: 121303 + 403 = 121706
Step 303: 121706 + 403 = 122109
Step 304: 122109 + 403 = 122512
Step 305: 122512 + 403 = 122915
Step 306: 122915 + 403 = 123318
Step 307: 123318 + 403 = 123721
Step 308: 123721 + 403 = 124124
Step 309: 124124 + 403 = 124527
Step 310: 124527 + 403 = 124930
Step 311: 124930 + 403 = 125333
Step 312: 125333 + 403 = 125736
Step 313: 125736 + 403 = 126139
Step 314: 126139 + 403 = 126542
Step 315: 126542 + 403 = 126945
Step 316: 126945 + 403 = 127348
Step 317: 127348 + 403 = 127751
Step 318: 127751 + 403 = 128154
Step 319: 128154 + 403 = 128557
Step 320: 128557 + 403 = 128960
Step 321: 128960 + 403 = 129363
Step 322: 129363 + 403 = 129766
Step 323: 129766 + 403 = 130169
Step 324: 130169 + 403 = 130572
Step 325: 130572 + 403 = 130975
Step 326: 130975 + 403 = 131378
Step 327: 131378 + 403 = 131781
Step 328: 131781 + 403 = 132184
Step 329: 132184 + 403 = 132587
Step 330: 132587 + 403 = 132990
Step 331: 132990 + 403 = 133393
Step 332: 133393 + 403 = 133796
Step 333: 133796 + 403 = 134199
Step 334: 134199 + 403 = 134602
Step 335: 134602 + 403 = 135005
Step 336: 135005 + 403 = 135408
Step 337: 135408 + 403 = 135811
Step 338: 135811 + 403 = 136214
Step 339: 136214 + 403 = 136617
Step 340: 136617 + 403 = 137020
Step 341: 137020 + 403 = 137423
Step 342: 137423 + 403 = 137826
Step 343: 137826 + 403 = 138229
Step 344: 138229 + 403 = 138632
Step 345: 138632 + 403 = 139035
Step 346: 139035 + 403 = 139438
Step 347: 139438 + 403 = 139841
Step 348: 139841 + 403 = 140244
Step 349: 140244 + 403 = 140647
Step 350: 140647 + 403 = 141050
Step 351: 141050 + 403 = 141453
Step 352: 141453 + 403 = 141856
Step 353: 141856 + 403 = 142259
Step 354: 142259 + 403 = 142662
Step 355: 142662 + 403 = 143065
Step 356: 143065 + 403 = 143468
Step 357: 143468 + 403 = 143871
Step 358: 143871 + 403 = 144274
Step 359: 144274 + 403 = 144677
Step 360: 144677 + 403 = 145080
Step 361: 145080 + 403 = 145483
Step 362: 145483 + 403 = 145886
Step 363: 145886 + 403 = 146289
Step 364: 146289 + 403 = 146692
Step 365: 146692 + 403 = 147095
Step 366: 147095 + 403 = 147498
Step 367: 147498 + 403 = 147901
Step 368: 147901 + 403 = 148304
Step 369: 148304 + 403 = 148707
Step 370: 148707 + 403 = 149110
Step 371: 149110 + 403 = 149513
Step 372: 149513 + 403 = 149916
Step 373: 149916 + 403 = 150319
Step 374: 150319 + 403 = 150722
Step 375: 150722 + 403 = 151125
Step 376: 151125 + 403 = 151528
Step 377: 151528 + 403 = 151931
Step 378: 151931 + 403 = 152334
Step 379: 152334 + 403 = 152737
Step 380: 152737 + 403 = 153140
Step 381: 153140 + 403 = 153543
Step 382: 153543 + 403 = 153946
Step 383: 153946 + 403 = 154349
Step 384: 154349 + 403 = 154752
Step 385: 154752 + 403 = 155155
Step 386: 155155 + 403 = 155558
Step 387: 155558 + 403 = 155961
Step 388: 155961 + 403 = 156364
Step 389: 156364 + 403 = 156767
Step 390: 156767 + 403 = 157170
Step 391: 157170 + 403 = 157573
Step 392: 157573 + 403 = 157976
Step 393: 157976 + 403 = 158379
Step 394: 158379 + 403 = 158782
Step 395: 158782 + 403 = 159185
Step 396: 159185 + 403 = 159588
Step 397: 159588 + 403 = 159991
Step 398: 159991 + 403 = 160394
Step 399: 160394 + 403 = 160797
Step 400: 160797 + 403 = 161200
Step 401: 161200 + 403 = 161603
Step 402: 161603 + 403 = 162006
Step 403: 162006 + 403 = 162409
Step 404: 162409 + 403 = 162812
Step 405: 162812 + 403 = 163215
Step 406: 163215 + 403 = 163618
Step 407: 163618 + 403 = 164021
Step 408: 164021 + 403 = 164424
Step 409: 164424 + 403 = 164827
Step 410: 164827 + 403 = 165230
Step 411: 165230 + 403 = 165633
Step 412: 165633 + 403 = 166036
Step 413: 166036 + 403 = 166439
Step 414: 166439 + 403 = 166842
Step 415: 166842 + 403 = 167245
Step 416: 167245 + 403 = 167648
Step 417: 167648 + 403 = 168051
Step 418: 168051 + 403 = 168454
Step 419: 168454 + 403 = 168857
Step 420: 168857 + 403 = 169260
Step 421: 169260 + 403 = 169663
Step 422: 169663 + 403 = 170066
Step 423: 170066 + 403 = 170469
Step 424: 170469 + 403 = 170872
Step 425: 170872 + 403 = 171275
Step 426: 171275 + 403 = 171678
Step 427: 171678 + 403 = 172081
Step 428: 172081 + 403 = 172484
Step 429: 172484 + 403 = 172887
Step 430: 172887 + 403 = 173290
Step 431: 173290 + 403 = 173693
Step 432: 173693 + 403 = 174096
Step 433: 174096 + 403 = 174499
Step 434: 174499 + 403 = 174902
Step 435: 174902 + 403 = 175305
Step 436: 175305 + 403 = 175708
Step 437: 175708 + 403 = 176111
Step 438: 176111 + 403 = 176514

So, 403*438 = 176514