OK, let's work through this together. We're starting with 677 and we're going to multiply it by 308, which means we add 677 to itself 308 times.
Step 1: 0 + 677 = 677
Step 2: 677 + 677 = 1354
Step 3: 1354 + 677 = 2031
Step 4: 2031 + 677 = 2708
Step 5: 2708 + 677 = 3385
Step 6: 3385 + 677 = 4062
Step 7: 4062 + 677 = 4739
Step 8: 4739 + 677 = 5416
Step 9: 5416 + 677 = 6093
Step 10: 6093 + 677 = 6770
Step 11: 6770 + 677 = 7447
Step 12: 7447 + 677 = 8124
Step 13: 8124 + 677 = 8801
Step 14: 8801 + 677 = 9478
Step 15: 9478 + 677 = 10155
Step 16: 10155 + 677 = 10832
Step 17: 10832 + 677 = 11509
Step 18: 11509 + 677 = 12186
Step 19: 12186 + 677 = 12863
Step 20: 12863 + 677 = 13540
Step 21: 13540 + 677 = 14217
Step 22: 14217 + 677 = 14894
Step 23: 14894 + 677 = 15571
Step 24: 15571 + 677 = 16248
Step 25: 16248 + 677 = 16925
Step 26: 16925 + 677 = 17602
Step 27: 17602 + 677 = 18279
Step 28: 18279 + 677 = 18956
Step 29: 18956 + 677 = 19633
Step 30: 19633 + 677 = 20310
Step 31: 20310 + 677 = 20987
Step 32: 20987 + 677 = 21664
Step 33: 21664 + 677 = 22341
Step 34: 22341 + 677 = 23018
Step 35: 23018 + 677 = 23695
Step 36: 23695 + 677 = 24372
Step 37: 24372 + 677 = 25049
Step 38: 25049 + 677 = 25726
Step 39: 25726 + 677 = 26403
Step 40: 26403 + 677 = 27080
Step 41: 27080 + 677 = 27757
Step 42: 27757 + 677 = 28434
Step 43: 28434 + 677 = 29111
Step 44: 29111 + 677 = 29788
Step 45: 29788 + 677 = 30465
Step 46: 30465 + 677 = 31142
Step 47: 31142 + 677 = 31819
Step 48: 31819 + 677 = 32496
Step 49: 32496 + 677 = 33173
Step 50: 33173 + 677 = 33850
Step 51: 33850 + 677 = 34527
Step 52: 34527 + 677 = 35204
Step 53: 35204 + 677 = 35881
Step 54: 35881 + 677 = 36558
Step 55: 36558 + 677 = 37235
Step 56: 37235 + 677 = 37912
Step 57: 37912 + 677 = 38589
Step 58: 38589 + 677 = 39266
Step 59: 39266 + 677 = 39943
Step 60: 39943 + 677 = 40620
Step 61: 40620 + 677 = 41297
Step 62: 41297 + 677 = 41974
Step 63: 41974 + 677 = 42651
Step 64: 42651 + 677 = 43328
Step 65: 43328 + 677 = 44005
Step 66: 44005 + 677 = 44682
Step 67: 44682 + 677 = 45359
Step 68: 45359 + 677 = 46036
Step 69: 46036 + 677 = 46713
Step 70: 46713 + 677 = 47390
Step 71: 47390 + 677 = 48067
Step 72: 48067 + 677 = 48744
Step 73: 48744 + 677 = 49421
Step 74: 49421 + 677 = 50098
Step 75: 50098 + 677 = 50775
Step 76: 50775 + 677 = 51452
Step 77: 51452 + 677 = 52129
Step 78: 52129 + 677 = 52806
Step 79: 52806 + 677 = 53483
Step 80: 53483 + 677 = 54160
Step 81: 54160 + 677 = 54837
Step 82: 54837 + 677 = 55514
Step 83: 55514 + 677 = 56191
Step 84: 56191 + 677 = 56868
Step 85: 56868 + 677 = 57545
Step 86: 57545 + 677 = 58222
Step 87: 58222 + 677 = 58899
Step 88: 58899 + 677 = 59576
Step 89: 59576 + 677 = 60253
Step 90: 60253 + 677 = 60930
Step 91: 60930 + 677 = 61607
Step 92: 61607 + 677 = 62284
Step 93: 62284 + 677 = 62961
Step 94: 62961 + 677 = 63638
Step 95: 63638 + 677 = 64315
Step 96: 64315 + 677 = 64992
Step 97: 64992 + 677 = 65669
Step 98: 65669 + 677 = 66346
Step 99: 66346 + 677 = 67023
Step 100: 67023 + 677 = 67700
Step 101: 67700 + 677 = 68377
Step 102: 68377 + 677 = 69054
Step 103: 69054 + 677 = 69731
Step 104: 69731 + 677 = 70408
Step 105: 70408 + 677 = 71085
Step 106: 71085 + 677 = 71762
Step 107: 71762 + 677 = 72439
Step 108: 72439 + 677 = 73116
Step 109: 73116 + 677 = 73793
Step 110: 73793 + 677 = 74470
Step 111: 74470 + 677 = 75147
Step 112: 75147 + 677 = 75824
Step 113: 75824 + 677 = 76501
Step 114: 76501 + 677 = 77178
Step 115: 77178 + 677 = 77855
Step 116: 77855 + 677 = 78532
Step 117: 78532 + 677 = 79209
Step 118: 79209 + 677 = 79886
Step 119: 79886 + 677 = 80563
Step 120: 80563 + 677 = 81240
Step 121: 81240 + 677 = 81917
Step 122: 81917 + 677 = 82594
Step 123: 82594 + 677 = 83271
Step 124: 83271 + 677 = 83948
Step 125: 83948 + 677 = 84625
Step 126: 84625 + 677 = 85302
Step 127: 85302 + 677 = 85979
Step 128: 85979 + 677 = 86656
Step 129: 86656 + 677 = 87333
Step 130: 87333 + 677 = 88010
Step 131: 88010 + 677 = 88687
Step 132: 88687 + 677 = 89364
Step 133: 89364 + 677 = 90041
Step 134: 90041 + 677 = 90718
Step 135: 90718 + 677 = 91395
Step 136: 91395 + 677 = 92072
Step 137: 92072 + 677 = 92749
Step 138: 92749 + 677 = 93426
Step 139: 93426 + 677 = 94103
Step 140: 94103 + 677 = 94780
Step 141: 94780 + 677 = 95457
Step 142: 95457 + 677 = 96134
Step 143: 96134 + 677 = 96811
Step 144: 96811 + 677 = 97488
Step 145: 97488 + 677 = 98165
Step 146: 98165 + 677 = 98842
Step 147: 98842 + 677 = 99519
Step 148: 99519 + 677 = 100196
Step 149: 100196 + 677 = 100873
Step 150: 100873 + 677 = 101550
Step 151: 101550 + 677 = 102227
Step 152: 102227 + 677 = 102904
Step 153: 102904 + 677 = 103581
Step 154: 103581 + 677 = 104258
Step 155: 104258 + 677 = 104935
Step 156: 104935 + 677 = 105612
Step 157: 105612 + 677 = 106289
Step 158: 106289 + 677 = 106966
Step 159: 106966 + 677 = 107643
Step 160: 107643 + 677 = 108320
Step 161: 108320 + 677 = 108997
Step 162: 108997 + 677 = 109674
Step 163: 109674 + 677 = 110351
Step 164: 110351 + 677 = 111028
Step 165: 111028 + 677 = 111705
Step 166: 111705 + 677 = 112382
Step 167: 112382 + 677 = 113059
Step 168: 113059 + 677 = 113736
Step 169: 113736 + 677 = 114413
Step 170: 114413 + 677 = 115090
Step 171: 115090 + 677 = 115767
Step 172: 115767 + 677 = 116444
Step 173: 116444 + 677 = 117121
Step 174: 117121 + 677 = 117798
Step 175: 117798 + 677 = 118475
Step 176: 118475 + 677 = 119152
Step 177: 119152 + 677 = 119829
Step 178: 119829 + 677 = 120506
Step 179: 120506 + 677 = 121183
Step 180: 121183 + 677 = 121860
Step 181: 121860 + 677 = 122537
Step 182: 122537 + 677 = 123214
Step 183: 123214 + 677 = 123891
Step 184: 123891 + 677 = 124568
Step 185: 124568 + 677 = 125245
Step 186: 125245 + 677 = 125922
Step 187: 125922 + 677 = 126599
Step 188: 126599 + 677 = 127276
Step 189: 127276 + 677 = 127953
Step 190: 127953 + 677 = 128630
Step 191: 128630 + 677 = 129307
Step 192: 129307 + 677 = 129984
Step 193: 129984 + 677 = 130661
Step 194: 130661 + 677 = 131338
Step 195: 131338 + 677 = 132015
Step 196: 132015 + 677 = 132692
Step 197: 132692 + 677 = 133369
Step 198: 133369 + 677 = 134046
Step 199: 134046 + 677 = 134723
Step 200: 134723 + 677 = 135400
Step 201: 135400 + 677 = 136077
Step 202: 136077 + 677 = 136754
Step 203: 136754 + 677 = 137431
Step 204: 137431 + 677 = 138108
Step 205: 138108 + 677 = 138785
Step 206: 138785 + 677 = 139462
Step 207: 139462 + 677 = 140139
Step 208: 140139 + 677 = 140816
Step 209: 140816 + 677 = 141493
Step 210: 141493 + 677 = 142170
Step 211: 142170 + 677 = 142847
Step 212: 142847 + 677 = 143524
Step 213: 143524 + 677 = 144201
Step 214: 144201 + 677 = 144878
Step 215: 144878 + 677 = 145555
Step 216: 145555 + 677 = 146232
Step 217: 146232 + 677 = 146909
Step 218: 146909 + 677 = 147586
Step 219: 147586 + 677 = 148263
Step 220: 148263 + 677 = 148940
Step 221: 148940 + 677 = 149617
Step 222: 149617 + 677 = 150294
Step 223: 150294 + 677 = 150971
Step 224: 150971 + 677 = 151648
Step 225: 151648 + 677 = 152325
Step 226: 152325 + 677 = 153002
Step 227: 153002 + 677 = 153679
Step 228: 153679 + 677 = 154356
Step 229: 154356 + 677 = 155033
Step 230: 155033 + 677 = 155710
Step 231: 155710 + 677 = 156387
Step 232: 156387 + 677 = 157064
Step 233: 157064 + 677 = 157741
Step 234: 157741 + 677 = 158418
Step 235: 158418 + 677 = 159095
Step 236: 159095 + 677 = 159772
Step 237: 159772 + 677 = 160449
Step 238: 160449 + 677 = 161126
Step 239: 161126 + 677 = 161803
Step 240: 161803 + 677 = 162480
Step 241: 162480 + 677 = 163157
Step 242: 163157 + 677 = 163834
Step 243: 163834 + 677 = 164511
Step 244: 164511 + 677 = 165188
Step 245: 165188 + 677 = 165865
Step 246: 165865 + 677 = 166542
Step 247: 166542 + 677 = 167219
Step 248: 167219 + 677 = 167896
Step 249: 167896 + 677 = 168573
Step 250: 168573 + 677 = 169250
Step 251: 169250 + 677 = 169927
Step 252: 169927 + 677 = 170604
Step 253: 170604 + 677 = 171281
Step 254: 171281 + 677 = 171958
Step 255: 171958 + 677 = 172635
Step 256: 172635 + 677 = 173312
Step 257: 173312 + 677 = 173989
Step 258: 173989 + 677 = 174666
Step 259: 174666 + 677 = 175343
Step 260: 175343 + 677 = 176020
Step 261: 176020 + 677 = 176697
Step 262: 176697 + 677 = 177374
Step 263: 177374 + 677 = 178051
Step 264: 178051 + 677 = 178728
Step 265: 178728 + 677 = 179405
Step 266: 179405 + 677 = 180082
Step 267: 180082 + 677 = 180759
Step 268: 180759 + 677 = 181436
Step 269: 181436 + 677 = 182113
Step 270: 182113 + 677 = 182790
Step 271: 182790 + 677 = 183467
Step 272: 183467 + 677 = 184144
Step 273: 184144 + 677 = 184821
Step 274: 184821 + 677 = 185498
Step 275: 185498 + 677 = 186175
Step 276: 186175 + 677 = 186852
Step 277: 186852 + 677 = 187529
Step 278: 187529 + 677 = 188206
Step 279: 188206 + 677 = 188883
Step 280: 188883 + 677 = 189560
Step 281: 189560 + 677 = 190237
Step 282: 190237 + 677 = 190914
Step 283: 190914 + 677 = 191591
Step 284: 191591 + 677 = 192268
Step 285: 192268 + 677 = 192945
Step 286: 192945 + 677 = 193622
Step 287: 193622 + 677 = 194299
Step 288: 194299 + 677 = 194976
Step 289: 194976 + 677 = 195653
Step 290: 195653 + 677 = 196330
Step 291: 196330 + 677 = 197007
Step 292: 197007 + 677 = 197684
Step 293: 197684 + 677 = 198361
Step 294: 198361 + 677 = 199038
Step 295: 199038 + 677 = 199715
Step 296: 199715 + 677 = 200392
Step 297: 200392 + 677 = 201069
Step 298: 201069 + 677 = 201746
Step 299: 201746 + 677 = 202423
Step 300: 202423 + 677 = 203100
Step 301: 203100 + 677 = 203777
Step 302: 203777 + 677 = 204454
Step 303: 204454 + 677 = 205131
Step 304: 205131 + 677 = 205808
Step 305: 205808 + 677 = 206485
Step 306: 206485 + 677 = 207162
Step 307: 207162 + 677 = 207839
Step 308: 207839 + 677 = 208516

So, 677*308 = 208516