Let's roll up our sleeves and solve this. We have 939 and we're going to multiply it by 398, essentially adding 939 to itself 398 times.
Step 1: 0 + 939 = 939
Step 2: 939 + 939 = 1878
Step 3: 1878 + 939 = 2817
Step 4: 2817 + 939 = 3756
Step 5: 3756 + 939 = 4695
Step 6: 4695 + 939 = 5634
Step 7: 5634 + 939 = 6573
Step 8: 6573 + 939 = 7512
Step 9: 7512 + 939 = 8451
Step 10: 8451 + 939 = 9390
Step 11: 9390 + 939 = 10329
Step 12: 10329 + 939 = 11268
Step 13: 11268 + 939 = 12207
Step 14: 12207 + 939 = 13146
Step 15: 13146 + 939 = 14085
Step 16: 14085 + 939 = 15024
Step 17: 15024 + 939 = 15963
Step 18: 15963 + 939 = 16902
Step 19: 16902 + 939 = 17841
Step 20: 17841 + 939 = 18780
Step 21: 18780 + 939 = 19719
Step 22: 19719 + 939 = 20658
Step 23: 20658 + 939 = 21597
Step 24: 21597 + 939 = 22536
Step 25: 22536 + 939 = 23475
Step 26: 23475 + 939 = 24414
Step 27: 24414 + 939 = 25353
Step 28: 25353 + 939 = 26292
Step 29: 26292 + 939 = 27231
Step 30: 27231 + 939 = 28170
Step 31: 28170 + 939 = 29109
Step 32: 29109 + 939 = 30048
Step 33: 30048 + 939 = 30987
Step 34: 30987 + 939 = 31926
Step 35: 31926 + 939 = 32865
Step 36: 32865 + 939 = 33804
Step 37: 33804 + 939 = 34743
Step 38: 34743 + 939 = 35682
Step 39: 35682 + 939 = 36621
Step 40: 36621 + 939 = 37560
Step 41: 37560 + 939 = 38499
Step 42: 38499 + 939 = 39438
Step 43: 39438 + 939 = 40377
Step 44: 40377 + 939 = 41316
Step 45: 41316 + 939 = 42255
Step 46: 42255 + 939 = 43194
Step 47: 43194 + 939 = 44133
Step 48: 44133 + 939 = 45072
Step 49: 45072 + 939 = 46011
Step 50: 46011 + 939 = 46950
Step 51: 46950 + 939 = 47889
Step 52: 47889 + 939 = 48828
Step 53: 48828 + 939 = 49767
Step 54: 49767 + 939 = 50706
Step 55: 50706 + 939 = 51645
Step 56: 51645 + 939 = 52584
Step 57: 52584 + 939 = 53523
Step 58: 53523 + 939 = 54462
Step 59: 54462 + 939 = 55401
Step 60: 55401 + 939 = 56340
Step 61: 56340 + 939 = 57279
Step 62: 57279 + 939 = 58218
Step 63: 58218 + 939 = 59157
Step 64: 59157 + 939 = 60096
Step 65: 60096 + 939 = 61035
Step 66: 61035 + 939 = 61974
Step 67: 61974 + 939 = 62913
Step 68: 62913 + 939 = 63852
Step 69: 63852 + 939 = 64791
Step 70: 64791 + 939 = 65730
Step 71: 65730 + 939 = 66669
Step 72: 66669 + 939 = 67608
Step 73: 67608 + 939 = 68547
Step 74: 68547 + 939 = 69486
Step 75: 69486 + 939 = 70425
Step 76: 70425 + 939 = 71364
Step 77: 71364 + 939 = 72303
Step 78: 72303 + 939 = 73242
Step 79: 73242 + 939 = 74181
Step 80: 74181 + 939 = 75120
Step 81: 75120 + 939 = 76059
Step 82: 76059 + 939 = 76998
Step 83: 76998 + 939 = 77937
Step 84: 77937 + 939 = 78876
Step 85: 78876 + 939 = 79815
Step 86: 79815 + 939 = 80754
Step 87: 80754 + 939 = 81693
Step 88: 81693 + 939 = 82632
Step 89: 82632 + 939 = 83571
Step 90: 83571 + 939 = 84510
Step 91: 84510 + 939 = 85449
Step 92: 85449 + 939 = 86388
Step 93: 86388 + 939 = 87327
Step 94: 87327 + 939 = 88266
Step 95: 88266 + 939 = 89205
Step 96: 89205 + 939 = 90144
Step 97: 90144 + 939 = 91083
Step 98: 91083 + 939 = 92022
Step 99: 92022 + 939 = 92961
Step 100: 92961 + 939 = 93900
Step 101: 93900 + 939 = 94839
Step 102: 94839 + 939 = 95778
Step 103: 95778 + 939 = 96717
Step 104: 96717 + 939 = 97656
Step 105: 97656 + 939 = 98595
Step 106: 98595 + 939 = 99534
Step 107: 99534 + 939 = 100473
Step 108: 100473 + 939 = 101412
Step 109: 101412 + 939 = 102351
Step 110: 102351 + 939 = 103290
Step 111: 103290 + 939 = 104229
Step 112: 104229 + 939 = 105168
Step 113: 105168 + 939 = 106107
Step 114: 106107 + 939 = 107046
Step 115: 107046 + 939 = 107985
Step 116: 107985 + 939 = 108924
Step 117: 108924 + 939 = 109863
Step 118: 109863 + 939 = 110802
Step 119: 110802 + 939 = 111741
Step 120: 111741 + 939 = 112680
Step 121: 112680 + 939 = 113619
Step 122: 113619 + 939 = 114558
Step 123: 114558 + 939 = 115497
Step 124: 115497 + 939 = 116436
Step 125: 116436 + 939 = 117375
Step 126: 117375 + 939 = 118314
Step 127: 118314 + 939 = 119253
Step 128: 119253 + 939 = 120192
Step 129: 120192 + 939 = 121131
Step 130: 121131 + 939 = 122070
Step 131: 122070 + 939 = 123009
Step 132: 123009 + 939 = 123948
Step 133: 123948 + 939 = 124887
Step 134: 124887 + 939 = 125826
Step 135: 125826 + 939 = 126765
Step 136: 126765 + 939 = 127704
Step 137: 127704 + 939 = 128643
Step 138: 128643 + 939 = 129582
Step 139: 129582 + 939 = 130521
Step 140: 130521 + 939 = 131460
Step 141: 131460 + 939 = 132399
Step 142: 132399 + 939 = 133338
Step 143: 133338 + 939 = 134277
Step 144: 134277 + 939 = 135216
Step 145: 135216 + 939 = 136155
Step 146: 136155 + 939 = 137094
Step 147: 137094 + 939 = 138033
Step 148: 138033 + 939 = 138972
Step 149: 138972 + 939 = 139911
Step 150: 139911 + 939 = 140850
Step 151: 140850 + 939 = 141789
Step 152: 141789 + 939 = 142728
Step 153: 142728 + 939 = 143667
Step 154: 143667 + 939 = 144606
Step 155: 144606 + 939 = 145545
Step 156: 145545 + 939 = 146484
Step 157: 146484 + 939 = 147423
Step 158: 147423 + 939 = 148362
Step 159: 148362 + 939 = 149301
Step 160: 149301 + 939 = 150240
Step 161: 150240 + 939 = 151179
Step 162: 151179 + 939 = 152118
Step 163: 152118 + 939 = 153057
Step 164: 153057 + 939 = 153996
Step 165: 153996 + 939 = 154935
Step 166: 154935 + 939 = 155874
Step 167: 155874 + 939 = 156813
Step 168: 156813 + 939 = 157752
Step 169: 157752 + 939 = 158691
Step 170: 158691 + 939 = 159630
Step 171: 159630 + 939 = 160569
Step 172: 160569 + 939 = 161508
Step 173: 161508 + 939 = 162447
Step 174: 162447 + 939 = 163386
Step 175: 163386 + 939 = 164325
Step 176: 164325 + 939 = 165264
Step 177: 165264 + 939 = 166203
Step 178: 166203 + 939 = 167142
Step 179: 167142 + 939 = 168081
Step 180: 168081 + 939 = 169020
Step 181: 169020 + 939 = 169959
Step 182: 169959 + 939 = 170898
Step 183: 170898 + 939 = 171837
Step 184: 171837 + 939 = 172776
Step 185: 172776 + 939 = 173715
Step 186: 173715 + 939 = 174654
Step 187: 174654 + 939 = 175593
Step 188: 175593 + 939 = 176532
Step 189: 176532 + 939 = 177471
Step 190: 177471 + 939 = 178410
Step 191: 178410 + 939 = 179349
Step 192: 179349 + 939 = 180288
Step 193: 180288 + 939 = 181227
Step 194: 181227 + 939 = 182166
Step 195: 182166 + 939 = 183105
Step 196: 183105 + 939 = 184044
Step 197: 184044 + 939 = 184983
Step 198: 184983 + 939 = 185922
Step 199: 185922 + 939 = 186861
Step 200: 186861 + 939 = 187800
Step 201: 187800 + 939 = 188739
Step 202: 188739 + 939 = 189678
Step 203: 189678 + 939 = 190617
Step 204: 190617 + 939 = 191556
Step 205: 191556 + 939 = 192495
Step 206: 192495 + 939 = 193434
Step 207: 193434 + 939 = 194373
Step 208: 194373 + 939 = 195312
Step 209: 195312 + 939 = 196251
Step 210: 196251 + 939 = 197190
Step 211: 197190 + 939 = 198129
Step 212: 198129 + 939 = 199068
Step 213: 199068 + 939 = 200007
Step 214: 200007 + 939 = 200946
Step 215: 200946 + 939 = 201885
Step 216: 201885 + 939 = 202824
Step 217: 202824 + 939 = 203763
Step 218: 203763 + 939 = 204702
Step 219: 204702 + 939 = 205641
Step 220: 205641 + 939 = 206580
Step 221: 206580 + 939 = 207519
Step 222: 207519 + 939 = 208458
Step 223: 208458 + 939 = 209397
Step 224: 209397 + 939 = 210336
Step 225: 210336 + 939 = 211275
Step 226: 211275 + 939 = 212214
Step 227: 212214 + 939 = 213153
Step 228: 213153 + 939 = 214092
Step 229: 214092 + 939 = 215031
Step 230: 215031 + 939 = 215970
Step 231: 215970 + 939 = 216909
Step 232: 216909 + 939 = 217848
Step 233: 217848 + 939 = 218787
Step 234: 218787 + 939 = 219726
Step 235: 219726 + 939 = 220665
Step 236: 220665 + 939 = 221604
Step 237: 221604 + 939 = 222543
Step 238: 222543 + 939 = 223482
Step 239: 223482 + 939 = 224421
Step 240: 224421 + 939 = 225360
Step 241: 225360 + 939 = 226299
Step 242: 226299 + 939 = 227238
Step 243: 227238 + 939 = 228177
Step 244: 228177 + 939 = 229116
Step 245: 229116 + 939 = 230055
Step 246: 230055 + 939 = 230994
Step 247: 230994 + 939 = 231933
Step 248: 231933 + 939 = 232872
Step 249: 232872 + 939 = 233811
Step 250: 233811 + 939 = 234750
Step 251: 234750 + 939 = 235689
Step 252: 235689 + 939 = 236628
Step 253: 236628 + 939 = 237567
Step 254: 237567 + 939 = 238506
Step 255: 238506 + 939 = 239445
Step 256: 239445 + 939 = 240384
Step 257: 240384 + 939 = 241323
Step 258: 241323 + 939 = 242262
Step 259: 242262 + 939 = 243201
Step 260: 243201 + 939 = 244140
Step 261: 244140 + 939 = 245079
Step 262: 245079 + 939 = 246018
Step 263: 246018 + 939 = 246957
Step 264: 246957 + 939 = 247896
Step 265: 247896 + 939 = 248835
Step 266: 248835 + 939 = 249774
Step 267: 249774 + 939 = 250713
Step 268: 250713 + 939 = 251652
Step 269: 251652 + 939 = 252591
Step 270: 252591 + 939 = 253530
Step 271: 253530 + 939 = 254469
Step 272: 254469 + 939 = 255408
Step 273: 255408 + 939 = 256347
Step 274: 256347 + 939 = 257286
Step 275: 257286 + 939 = 258225
Step 276: 258225 + 939 = 259164
Step 277: 259164 + 939 = 260103
Step 278: 260103 + 939 = 261042
Step 279: 261042 + 939 = 261981
Step 280: 261981 + 939 = 262920
Step 281: 262920 + 939 = 263859
Step 282: 263859 + 939 = 264798
Step 283: 264798 + 939 = 265737
Step 284: 265737 + 939 = 266676
Step 285: 266676 + 939 = 267615
Step 286: 267615 + 939 = 268554
Step 287: 268554 + 939 = 269493
Step 288: 269493 + 939 = 270432
Step 289: 270432 + 939 = 271371
Step 290: 271371 + 939 = 272310
Step 291: 272310 + 939 = 273249
Step 292: 273249 + 939 = 274188
Step 293: 274188 + 939 = 275127
Step 294: 275127 + 939 = 276066
Step 295: 276066 + 939 = 277005
Step 296: 277005 + 939 = 277944
Step 297: 277944 + 939 = 278883
Step 298: 278883 + 939 = 279822
Step 299: 279822 + 939 = 280761
Step 300: 280761 + 939 = 281700
Step 301: 281700 + 939 = 282639
Step 302: 282639 + 939 = 283578
Step 303: 283578 + 939 = 284517
Step 304: 284517 + 939 = 285456
Step 305: 285456 + 939 = 286395
Step 306: 286395 + 939 = 287334
Step 307: 287334 + 939 = 288273
Step 308: 288273 + 939 = 289212
Step 309: 289212 + 939 = 290151
Step 310: 290151 + 939 = 291090
Step 311: 291090 + 939 = 292029
Step 312: 292029 + 939 = 292968
Step 313: 292968 + 939 = 293907
Step 314: 293907 + 939 = 294846
Step 315: 294846 + 939 = 295785
Step 316: 295785 + 939 = 296724
Step 317: 296724 + 939 = 297663
Step 318: 297663 + 939 = 298602
Step 319: 298602 + 939 = 299541
Step 320: 299541 + 939 = 300480
Step 321: 300480 + 939 = 301419
Step 322: 301419 + 939 = 302358
Step 323: 302358 + 939 = 303297
Step 324: 303297 + 939 = 304236
Step 325: 304236 + 939 = 305175
Step 326: 305175 + 939 = 306114
Step 327: 306114 + 939 = 307053
Step 328: 307053 + 939 = 307992
Step 329: 307992 + 939 = 308931
Step 330: 308931 + 939 = 309870
Step 331: 309870 + 939 = 310809
Step 332: 310809 + 939 = 311748
Step 333: 311748 + 939 = 312687
Step 334: 312687 + 939 = 313626
Step 335: 313626 + 939 = 314565
Step 336: 314565 + 939 = 315504
Step 337: 315504 + 939 = 316443
Step 338: 316443 + 939 = 317382
Step 339: 317382 + 939 = 318321
Step 340: 318321 + 939 = 319260
Step 341: 319260 + 939 = 320199
Step 342: 320199 + 939 = 321138
Step 343: 321138 + 939 = 322077
Step 344: 322077 + 939 = 323016
Step 345: 323016 + 939 = 323955
Step 346: 323955 + 939 = 324894
Step 347: 324894 + 939 = 325833
Step 348: 325833 + 939 = 326772
Step 349: 326772 + 939 = 327711
Step 350: 327711 + 939 = 328650
Step 351: 328650 + 939 = 329589
Step 352: 329589 + 939 = 330528
Step 353: 330528 + 939 = 331467
Step 354: 331467 + 939 = 332406
Step 355: 332406 + 939 = 333345
Step 356: 333345 + 939 = 334284
Step 357: 334284 + 939 = 335223
Step 358: 335223 + 939 = 336162
Step 359: 336162 + 939 = 337101
Step 360: 337101 + 939 = 338040
Step 361: 338040 + 939 = 338979
Step 362: 338979 + 939 = 339918
Step 363: 339918 + 939 = 340857
Step 364: 340857 + 939 = 341796
Step 365: 341796 + 939 = 342735
Step 366: 342735 + 939 = 343674
Step 367: 343674 + 939 = 344613
Step 368: 344613 + 939 = 345552
Step 369: 345552 + 939 = 346491
Step 370: 346491 + 939 = 347430
Step 371: 347430 + 939 = 348369
Step 372: 348369 + 939 = 349308
Step 373: 349308 + 939 = 350247
Step 374: 350247 + 939 = 351186
Step 375: 351186 + 939 = 352125
Step 376: 352125 + 939 = 353064
Step 377: 353064 + 939 = 354003
Step 378: 354003 + 939 = 354942
Step 379: 354942 + 939 = 355881
Step 380: 355881 + 939 = 356820
Step 381: 356820 + 939 = 357759
Step 382: 357759 + 939 = 358698
Step 383: 358698 + 939 = 359637
Step 384: 359637 + 939 = 360576
Step 385: 360576 + 939 = 361515
Step 386: 361515 + 939 = 362454
Step 387: 362454 + 939 = 363393
Step 388: 363393 + 939 = 364332
Step 389: 364332 + 939 = 365271
Step 390: 365271 + 939 = 366210
Step 391: 366210 + 939 = 367149
Step 392: 367149 + 939 = 368088
Step 393: 368088 + 939 = 369027
Step 394: 369027 + 939 = 369966
Step 395: 369966 + 939 = 370905
Step 396: 370905 + 939 = 371844
Step 397: 371844 + 939 = 372783
Step 398: 372783 + 939 = 373722

So, 939*398 = 373722