Alright, let's solve this math problem step by step. First, we have the number 393. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 428. So, we're going to take the number 393 and add it to itself 428 times.
Step 1: 0 + 393 = 393
Step 2: 393 + 393 = 786
Step 3: 786 + 393 = 1179
Step 4: 1179 + 393 = 1572
Step 5: 1572 + 393 = 1965
Step 6: 1965 + 393 = 2358
Step 7: 2358 + 393 = 2751
Step 8: 2751 + 393 = 3144
Step 9: 3144 + 393 = 3537
Step 10: 3537 + 393 = 3930
Step 11: 3930 + 393 = 4323
Step 12: 4323 + 393 = 4716
Step 13: 4716 + 393 = 5109
Step 14: 5109 + 393 = 5502
Step 15: 5502 + 393 = 5895
Step 16: 5895 + 393 = 6288
Step 17: 6288 + 393 = 6681
Step 18: 6681 + 393 = 7074
Step 19: 7074 + 393 = 7467
Step 20: 7467 + 393 = 7860
Step 21: 7860 + 393 = 8253
Step 22: 8253 + 393 = 8646
Step 23: 8646 + 393 = 9039
Step 24: 9039 + 393 = 9432
Step 25: 9432 + 393 = 9825
Step 26: 9825 + 393 = 10218
Step 27: 10218 + 393 = 10611
Step 28: 10611 + 393 = 11004
Step 29: 11004 + 393 = 11397
Step 30: 11397 + 393 = 11790
Step 31: 11790 + 393 = 12183
Step 32: 12183 + 393 = 12576
Step 33: 12576 + 393 = 12969
Step 34: 12969 + 393 = 13362
Step 35: 13362 + 393 = 13755
Step 36: 13755 + 393 = 14148
Step 37: 14148 + 393 = 14541
Step 38: 14541 + 393 = 14934
Step 39: 14934 + 393 = 15327
Step 40: 15327 + 393 = 15720
Step 41: 15720 + 393 = 16113
Step 42: 16113 + 393 = 16506
Step 43: 16506 + 393 = 16899
Step 44: 16899 + 393 = 17292
Step 45: 17292 + 393 = 17685
Step 46: 17685 + 393 = 18078
Step 47: 18078 + 393 = 18471
Step 48: 18471 + 393 = 18864
Step 49: 18864 + 393 = 19257
Step 50: 19257 + 393 = 19650
Step 51: 19650 + 393 = 20043
Step 52: 20043 + 393 = 20436
Step 53: 20436 + 393 = 20829
Step 54: 20829 + 393 = 21222
Step 55: 21222 + 393 = 21615
Step 56: 21615 + 393 = 22008
Step 57: 22008 + 393 = 22401
Step 58: 22401 + 393 = 22794
Step 59: 22794 + 393 = 23187
Step 60: 23187 + 393 = 23580
Step 61: 23580 + 393 = 23973
Step 62: 23973 + 393 = 24366
Step 63: 24366 + 393 = 24759
Step 64: 24759 + 393 = 25152
Step 65: 25152 + 393 = 25545
Step 66: 25545 + 393 = 25938
Step 67: 25938 + 393 = 26331
Step 68: 26331 + 393 = 26724
Step 69: 26724 + 393 = 27117
Step 70: 27117 + 393 = 27510
Step 71: 27510 + 393 = 27903
Step 72: 27903 + 393 = 28296
Step 73: 28296 + 393 = 28689
Step 74: 28689 + 393 = 29082
Step 75: 29082 + 393 = 29475
Step 76: 29475 + 393 = 29868
Step 77: 29868 + 393 = 30261
Step 78: 30261 + 393 = 30654
Step 79: 30654 + 393 = 31047
Step 80: 31047 + 393 = 31440
Step 81: 31440 + 393 = 31833
Step 82: 31833 + 393 = 32226
Step 83: 32226 + 393 = 32619
Step 84: 32619 + 393 = 33012
Step 85: 33012 + 393 = 33405
Step 86: 33405 + 393 = 33798
Step 87: 33798 + 393 = 34191
Step 88: 34191 + 393 = 34584
Step 89: 34584 + 393 = 34977
Step 90: 34977 + 393 = 35370
Step 91: 35370 + 393 = 35763
Step 92: 35763 + 393 = 36156
Step 93: 36156 + 393 = 36549
Step 94: 36549 + 393 = 36942
Step 95: 36942 + 393 = 37335
Step 96: 37335 + 393 = 37728
Step 97: 37728 + 393 = 38121
Step 98: 38121 + 393 = 38514
Step 99: 38514 + 393 = 38907
Step 100: 38907 + 393 = 39300
Step 101: 39300 + 393 = 39693
Step 102: 39693 + 393 = 40086
Step 103: 40086 + 393 = 40479
Step 104: 40479 + 393 = 40872
Step 105: 40872 + 393 = 41265
Step 106: 41265 + 393 = 41658
Step 107: 41658 + 393 = 42051
Step 108: 42051 + 393 = 42444
Step 109: 42444 + 393 = 42837
Step 110: 42837 + 393 = 43230
Step 111: 43230 + 393 = 43623
Step 112: 43623 + 393 = 44016
Step 113: 44016 + 393 = 44409
Step 114: 44409 + 393 = 44802
Step 115: 44802 + 393 = 45195
Step 116: 45195 + 393 = 45588
Step 117: 45588 + 393 = 45981
Step 118: 45981 + 393 = 46374
Step 119: 46374 + 393 = 46767
Step 120: 46767 + 393 = 47160
Step 121: 47160 + 393 = 47553
Step 122: 47553 + 393 = 47946
Step 123: 47946 + 393 = 48339
Step 124: 48339 + 393 = 48732
Step 125: 48732 + 393 = 49125
Step 126: 49125 + 393 = 49518
Step 127: 49518 + 393 = 49911
Step 128: 49911 + 393 = 50304
Step 129: 50304 + 393 = 50697
Step 130: 50697 + 393 = 51090
Step 131: 51090 + 393 = 51483
Step 132: 51483 + 393 = 51876
Step 133: 51876 + 393 = 52269
Step 134: 52269 + 393 = 52662
Step 135: 52662 + 393 = 53055
Step 136: 53055 + 393 = 53448
Step 137: 53448 + 393 = 53841
Step 138: 53841 + 393 = 54234
Step 139: 54234 + 393 = 54627
Step 140: 54627 + 393 = 55020
Step 141: 55020 + 393 = 55413
Step 142: 55413 + 393 = 55806
Step 143: 55806 + 393 = 56199
Step 144: 56199 + 393 = 56592
Step 145: 56592 + 393 = 56985
Step 146: 56985 + 393 = 57378
Step 147: 57378 + 393 = 57771
Step 148: 57771 + 393 = 58164
Step 149: 58164 + 393 = 58557
Step 150: 58557 + 393 = 58950
Step 151: 58950 + 393 = 59343
Step 152: 59343 + 393 = 59736
Step 153: 59736 + 393 = 60129
Step 154: 60129 + 393 = 60522
Step 155: 60522 + 393 = 60915
Step 156: 60915 + 393 = 61308
Step 157: 61308 + 393 = 61701
Step 158: 61701 + 393 = 62094
Step 159: 62094 + 393 = 62487
Step 160: 62487 + 393 = 62880
Step 161: 62880 + 393 = 63273
Step 162: 63273 + 393 = 63666
Step 163: 63666 + 393 = 64059
Step 164: 64059 + 393 = 64452
Step 165: 64452 + 393 = 64845
Step 166: 64845 + 393 = 65238
Step 167: 65238 + 393 = 65631
Step 168: 65631 + 393 = 66024
Step 169: 66024 + 393 = 66417
Step 170: 66417 + 393 = 66810
Step 171: 66810 + 393 = 67203
Step 172: 67203 + 393 = 67596
Step 173: 67596 + 393 = 67989
Step 174: 67989 + 393 = 68382
Step 175: 68382 + 393 = 68775
Step 176: 68775 + 393 = 69168
Step 177: 69168 + 393 = 69561
Step 178: 69561 + 393 = 69954
Step 179: 69954 + 393 = 70347
Step 180: 70347 + 393 = 70740
Step 181: 70740 + 393 = 71133
Step 182: 71133 + 393 = 71526
Step 183: 71526 + 393 = 71919
Step 184: 71919 + 393 = 72312
Step 185: 72312 + 393 = 72705
Step 186: 72705 + 393 = 73098
Step 187: 73098 + 393 = 73491
Step 188: 73491 + 393 = 73884
Step 189: 73884 + 393 = 74277
Step 190: 74277 + 393 = 74670
Step 191: 74670 + 393 = 75063
Step 192: 75063 + 393 = 75456
Step 193: 75456 + 393 = 75849
Step 194: 75849 + 393 = 76242
Step 195: 76242 + 393 = 76635
Step 196: 76635 + 393 = 77028
Step 197: 77028 + 393 = 77421
Step 198: 77421 + 393 = 77814
Step 199: 77814 + 393 = 78207
Step 200: 78207 + 393 = 78600
Step 201: 78600 + 393 = 78993
Step 202: 78993 + 393 = 79386
Step 203: 79386 + 393 = 79779
Step 204: 79779 + 393 = 80172
Step 205: 80172 + 393 = 80565
Step 206: 80565 + 393 = 80958
Step 207: 80958 + 393 = 81351
Step 208: 81351 + 393 = 81744
Step 209: 81744 + 393 = 82137
Step 210: 82137 + 393 = 82530
Step 211: 82530 + 393 = 82923
Step 212: 82923 + 393 = 83316
Step 213: 83316 + 393 = 83709
Step 214: 83709 + 393 = 84102
Step 215: 84102 + 393 = 84495
Step 216: 84495 + 393 = 84888
Step 217: 84888 + 393 = 85281
Step 218: 85281 + 393 = 85674
Step 219: 85674 + 393 = 86067
Step 220: 86067 + 393 = 86460
Step 221: 86460 + 393 = 86853
Step 222: 86853 + 393 = 87246
Step 223: 87246 + 393 = 87639
Step 224: 87639 + 393 = 88032
Step 225: 88032 + 393 = 88425
Step 226: 88425 + 393 = 88818
Step 227: 88818 + 393 = 89211
Step 228: 89211 + 393 = 89604
Step 229: 89604 + 393 = 89997
Step 230: 89997 + 393 = 90390
Step 231: 90390 + 393 = 90783
Step 232: 90783 + 393 = 91176
Step 233: 91176 + 393 = 91569
Step 234: 91569 + 393 = 91962
Step 235: 91962 + 393 = 92355
Step 236: 92355 + 393 = 92748
Step 237: 92748 + 393 = 93141
Step 238: 93141 + 393 = 93534
Step 239: 93534 + 393 = 93927
Step 240: 93927 + 393 = 94320
Step 241: 94320 + 393 = 94713
Step 242: 94713 + 393 = 95106
Step 243: 95106 + 393 = 95499
Step 244: 95499 + 393 = 95892
Step 245: 95892 + 393 = 96285
Step 246: 96285 + 393 = 96678
Step 247: 96678 + 393 = 97071
Step 248: 97071 + 393 = 97464
Step 249: 97464 + 393 = 97857
Step 250: 97857 + 393 = 98250
Step 251: 98250 + 393 = 98643
Step 252: 98643 + 393 = 99036
Step 253: 99036 + 393 = 99429
Step 254: 99429 + 393 = 99822
Step 255: 99822 + 393 = 100215
Step 256: 100215 + 393 = 100608
Step 257: 100608 + 393 = 101001
Step 258: 101001 + 393 = 101394
Step 259: 101394 + 393 = 101787
Step 260: 101787 + 393 = 102180
Step 261: 102180 + 393 = 102573
Step 262: 102573 + 393 = 102966
Step 263: 102966 + 393 = 103359
Step 264: 103359 + 393 = 103752
Step 265: 103752 + 393 = 104145
Step 266: 104145 + 393 = 104538
Step 267: 104538 + 393 = 104931
Step 268: 104931 + 393 = 105324
Step 269: 105324 + 393 = 105717
Step 270: 105717 + 393 = 106110
Step 271: 106110 + 393 = 106503
Step 272: 106503 + 393 = 106896
Step 273: 106896 + 393 = 107289
Step 274: 107289 + 393 = 107682
Step 275: 107682 + 393 = 108075
Step 276: 108075 + 393 = 108468
Step 277: 108468 + 393 = 108861
Step 278: 108861 + 393 = 109254
Step 279: 109254 + 393 = 109647
Step 280: 109647 + 393 = 110040
Step 281: 110040 + 393 = 110433
Step 282: 110433 + 393 = 110826
Step 283: 110826 + 393 = 111219
Step 284: 111219 + 393 = 111612
Step 285: 111612 + 393 = 112005
Step 286: 112005 + 393 = 112398
Step 287: 112398 + 393 = 112791
Step 288: 112791 + 393 = 113184
Step 289: 113184 + 393 = 113577
Step 290: 113577 + 393 = 113970
Step 291: 113970 + 393 = 114363
Step 292: 114363 + 393 = 114756
Step 293: 114756 + 393 = 115149
Step 294: 115149 + 393 = 115542
Step 295: 115542 + 393 = 115935
Step 296: 115935 + 393 = 116328
Step 297: 116328 + 393 = 116721
Step 298: 116721 + 393 = 117114
Step 299: 117114 + 393 = 117507
Step 300: 117507 + 393 = 117900
Step 301: 117900 + 393 = 118293
Step 302: 118293 + 393 = 118686
Step 303: 118686 + 393 = 119079
Step 304: 119079 + 393 = 119472
Step 305: 119472 + 393 = 119865
Step 306: 119865 + 393 = 120258
Step 307: 120258 + 393 = 120651
Step 308: 120651 + 393 = 121044
Step 309: 121044 + 393 = 121437
Step 310: 121437 + 393 = 121830
Step 311: 121830 + 393 = 122223
Step 312: 122223 + 393 = 122616
Step 313: 122616 + 393 = 123009
Step 314: 123009 + 393 = 123402
Step 315: 123402 + 393 = 123795
Step 316: 123795 + 393 = 124188
Step 317: 124188 + 393 = 124581
Step 318: 124581 + 393 = 124974
Step 319: 124974 + 393 = 125367
Step 320: 125367 + 393 = 125760
Step 321: 125760 + 393 = 126153
Step 322: 126153 + 393 = 126546
Step 323: 126546 + 393 = 126939
Step 324: 126939 + 393 = 127332
Step 325: 127332 + 393 = 127725
Step 326: 127725 + 393 = 128118
Step 327: 128118 + 393 = 128511
Step 328: 128511 + 393 = 128904
Step 329: 128904 + 393 = 129297
Step 330: 129297 + 393 = 129690
Step 331: 129690 + 393 = 130083
Step 332: 130083 + 393 = 130476
Step 333: 130476 + 393 = 130869
Step 334: 130869 + 393 = 131262
Step 335: 131262 + 393 = 131655
Step 336: 131655 + 393 = 132048
Step 337: 132048 + 393 = 132441
Step 338: 132441 + 393 = 132834
Step 339: 132834 + 393 = 133227
Step 340: 133227 + 393 = 133620
Step 341: 133620 + 393 = 134013
Step 342: 134013 + 393 = 134406
Step 343: 134406 + 393 = 134799
Step 344: 134799 + 393 = 135192
Step 345: 135192 + 393 = 135585
Step 346: 135585 + 393 = 135978
Step 347: 135978 + 393 = 136371
Step 348: 136371 + 393 = 136764
Step 349: 136764 + 393 = 137157
Step 350: 137157 + 393 = 137550
Step 351: 137550 + 393 = 137943
Step 352: 137943 + 393 = 138336
Step 353: 138336 + 393 = 138729
Step 354: 138729 + 393 = 139122
Step 355: 139122 + 393 = 139515
Step 356: 139515 + 393 = 139908
Step 357: 139908 + 393 = 140301
Step 358: 140301 + 393 = 140694
Step 359: 140694 + 393 = 141087
Step 360: 141087 + 393 = 141480
Step 361: 141480 + 393 = 141873
Step 362: 141873 + 393 = 142266
Step 363: 142266 + 393 = 142659
Step 364: 142659 + 393 = 143052
Step 365: 143052 + 393 = 143445
Step 366: 143445 + 393 = 143838
Step 367: 143838 + 393 = 144231
Step 368: 144231 + 393 = 144624
Step 369: 144624 + 393 = 145017
Step 370: 145017 + 393 = 145410
Step 371: 145410 + 393 = 145803
Step 372: 145803 + 393 = 146196
Step 373: 146196 + 393 = 146589
Step 374: 146589 + 393 = 146982
Step 375: 146982 + 393 = 147375
Step 376: 147375 + 393 = 147768
Step 377: 147768 + 393 = 148161
Step 378: 148161 + 393 = 148554
Step 379: 148554 + 393 = 148947
Step 380: 148947 + 393 = 149340
Step 381: 149340 + 393 = 149733
Step 382: 149733 + 393 = 150126
Step 383: 150126 + 393 = 150519
Step 384: 150519 + 393 = 150912
Step 385: 150912 + 393 = 151305
Step 386: 151305 + 393 = 151698
Step 387: 151698 + 393 = 152091
Step 388: 152091 + 393 = 152484
Step 389: 152484 + 393 = 152877
Step 390: 152877 + 393 = 153270
Step 391: 153270 + 393 = 153663
Step 392: 153663 + 393 = 154056
Step 393: 154056 + 393 = 154449
Step 394: 154449 + 393 = 154842
Step 395: 154842 + 393 = 155235
Step 396: 155235 + 393 = 155628
Step 397: 155628 + 393 = 156021
Step 398: 156021 + 393 = 156414
Step 399: 156414 + 393 = 156807
Step 400: 156807 + 393 = 157200
Step 401: 157200 + 393 = 157593
Step 402: 157593 + 393 = 157986
Step 403: 157986 + 393 = 158379
Step 404: 158379 + 393 = 158772
Step 405: 158772 + 393 = 159165
Step 406: 159165 + 393 = 159558
Step 407: 159558 + 393 = 159951
Step 408: 159951 + 393 = 160344
Step 409: 160344 + 393 = 160737
Step 410: 160737 + 393 = 161130
Step 411: 161130 + 393 = 161523
Step 412: 161523 + 393 = 161916
Step 413: 161916 + 393 = 162309
Step 414: 162309 + 393 = 162702
Step 415: 162702 + 393 = 163095
Step 416: 163095 + 393 = 163488
Step 417: 163488 + 393 = 163881
Step 418: 163881 + 393 = 164274
Step 419: 164274 + 393 = 164667
Step 420: 164667 + 393 = 165060
Step 421: 165060 + 393 = 165453
Step 422: 165453 + 393 = 165846
Step 423: 165846 + 393 = 166239
Step 424: 166239 + 393 = 166632
Step 425: 166632 + 393 = 167025
Step 426: 167025 + 393 = 167418
Step 427: 167418 + 393 = 167811
Step 428: 167811 + 393 = 168204

So, 393*428 = 168204