OK, let's crack this. We're given 661 and our task is to multiply it by 348. Essentially, we'll be adding 661 to itself 348 times.
Step 1: 0 + 661 = 661
Step 2: 661 + 661 = 1322
Step 3: 1322 + 661 = 1983
Step 4: 1983 + 661 = 2644
Step 5: 2644 + 661 = 3305
Step 6: 3305 + 661 = 3966
Step 7: 3966 + 661 = 4627
Step 8: 4627 + 661 = 5288
Step 9: 5288 + 661 = 5949
Step 10: 5949 + 661 = 6610
Step 11: 6610 + 661 = 7271
Step 12: 7271 + 661 = 7932
Step 13: 7932 + 661 = 8593
Step 14: 8593 + 661 = 9254
Step 15: 9254 + 661 = 9915
Step 16: 9915 + 661 = 10576
Step 17: 10576 + 661 = 11237
Step 18: 11237 + 661 = 11898
Step 19: 11898 + 661 = 12559
Step 20: 12559 + 661 = 13220
Step 21: 13220 + 661 = 13881
Step 22: 13881 + 661 = 14542
Step 23: 14542 + 661 = 15203
Step 24: 15203 + 661 = 15864
Step 25: 15864 + 661 = 16525
Step 26: 16525 + 661 = 17186
Step 27: 17186 + 661 = 17847
Step 28: 17847 + 661 = 18508
Step 29: 18508 + 661 = 19169
Step 30: 19169 + 661 = 19830
Step 31: 19830 + 661 = 20491
Step 32: 20491 + 661 = 21152
Step 33: 21152 + 661 = 21813
Step 34: 21813 + 661 = 22474
Step 35: 22474 + 661 = 23135
Step 36: 23135 + 661 = 23796
Step 37: 23796 + 661 = 24457
Step 38: 24457 + 661 = 25118
Step 39: 25118 + 661 = 25779
Step 40: 25779 + 661 = 26440
Step 41: 26440 + 661 = 27101
Step 42: 27101 + 661 = 27762
Step 43: 27762 + 661 = 28423
Step 44: 28423 + 661 = 29084
Step 45: 29084 + 661 = 29745
Step 46: 29745 + 661 = 30406
Step 47: 30406 + 661 = 31067
Step 48: 31067 + 661 = 31728
Step 49: 31728 + 661 = 32389
Step 50: 32389 + 661 = 33050
Step 51: 33050 + 661 = 33711
Step 52: 33711 + 661 = 34372
Step 53: 34372 + 661 = 35033
Step 54: 35033 + 661 = 35694
Step 55: 35694 + 661 = 36355
Step 56: 36355 + 661 = 37016
Step 57: 37016 + 661 = 37677
Step 58: 37677 + 661 = 38338
Step 59: 38338 + 661 = 38999
Step 60: 38999 + 661 = 39660
Step 61: 39660 + 661 = 40321
Step 62: 40321 + 661 = 40982
Step 63: 40982 + 661 = 41643
Step 64: 41643 + 661 = 42304
Step 65: 42304 + 661 = 42965
Step 66: 42965 + 661 = 43626
Step 67: 43626 + 661 = 44287
Step 68: 44287 + 661 = 44948
Step 69: 44948 + 661 = 45609
Step 70: 45609 + 661 = 46270
Step 71: 46270 + 661 = 46931
Step 72: 46931 + 661 = 47592
Step 73: 47592 + 661 = 48253
Step 74: 48253 + 661 = 48914
Step 75: 48914 + 661 = 49575
Step 76: 49575 + 661 = 50236
Step 77: 50236 + 661 = 50897
Step 78: 50897 + 661 = 51558
Step 79: 51558 + 661 = 52219
Step 80: 52219 + 661 = 52880
Step 81: 52880 + 661 = 53541
Step 82: 53541 + 661 = 54202
Step 83: 54202 + 661 = 54863
Step 84: 54863 + 661 = 55524
Step 85: 55524 + 661 = 56185
Step 86: 56185 + 661 = 56846
Step 87: 56846 + 661 = 57507
Step 88: 57507 + 661 = 58168
Step 89: 58168 + 661 = 58829
Step 90: 58829 + 661 = 59490
Step 91: 59490 + 661 = 60151
Step 92: 60151 + 661 = 60812
Step 93: 60812 + 661 = 61473
Step 94: 61473 + 661 = 62134
Step 95: 62134 + 661 = 62795
Step 96: 62795 + 661 = 63456
Step 97: 63456 + 661 = 64117
Step 98: 64117 + 661 = 64778
Step 99: 64778 + 661 = 65439
Step 100: 65439 + 661 = 66100
Step 101: 66100 + 661 = 66761
Step 102: 66761 + 661 = 67422
Step 103: 67422 + 661 = 68083
Step 104: 68083 + 661 = 68744
Step 105: 68744 + 661 = 69405
Step 106: 69405 + 661 = 70066
Step 107: 70066 + 661 = 70727
Step 108: 70727 + 661 = 71388
Step 109: 71388 + 661 = 72049
Step 110: 72049 + 661 = 72710
Step 111: 72710 + 661 = 73371
Step 112: 73371 + 661 = 74032
Step 113: 74032 + 661 = 74693
Step 114: 74693 + 661 = 75354
Step 115: 75354 + 661 = 76015
Step 116: 76015 + 661 = 76676
Step 117: 76676 + 661 = 77337
Step 118: 77337 + 661 = 77998
Step 119: 77998 + 661 = 78659
Step 120: 78659 + 661 = 79320
Step 121: 79320 + 661 = 79981
Step 122: 79981 + 661 = 80642
Step 123: 80642 + 661 = 81303
Step 124: 81303 + 661 = 81964
Step 125: 81964 + 661 = 82625
Step 126: 82625 + 661 = 83286
Step 127: 83286 + 661 = 83947
Step 128: 83947 + 661 = 84608
Step 129: 84608 + 661 = 85269
Step 130: 85269 + 661 = 85930
Step 131: 85930 + 661 = 86591
Step 132: 86591 + 661 = 87252
Step 133: 87252 + 661 = 87913
Step 134: 87913 + 661 = 88574
Step 135: 88574 + 661 = 89235
Step 136: 89235 + 661 = 89896
Step 137: 89896 + 661 = 90557
Step 138: 90557 + 661 = 91218
Step 139: 91218 + 661 = 91879
Step 140: 91879 + 661 = 92540
Step 141: 92540 + 661 = 93201
Step 142: 93201 + 661 = 93862
Step 143: 93862 + 661 = 94523
Step 144: 94523 + 661 = 95184
Step 145: 95184 + 661 = 95845
Step 146: 95845 + 661 = 96506
Step 147: 96506 + 661 = 97167
Step 148: 97167 + 661 = 97828
Step 149: 97828 + 661 = 98489
Step 150: 98489 + 661 = 99150
Step 151: 99150 + 661 = 99811
Step 152: 99811 + 661 = 100472
Step 153: 100472 + 661 = 101133
Step 154: 101133 + 661 = 101794
Step 155: 101794 + 661 = 102455
Step 156: 102455 + 661 = 103116
Step 157: 103116 + 661 = 103777
Step 158: 103777 + 661 = 104438
Step 159: 104438 + 661 = 105099
Step 160: 105099 + 661 = 105760
Step 161: 105760 + 661 = 106421
Step 162: 106421 + 661 = 107082
Step 163: 107082 + 661 = 107743
Step 164: 107743 + 661 = 108404
Step 165: 108404 + 661 = 109065
Step 166: 109065 + 661 = 109726
Step 167: 109726 + 661 = 110387
Step 168: 110387 + 661 = 111048
Step 169: 111048 + 661 = 111709
Step 170: 111709 + 661 = 112370
Step 171: 112370 + 661 = 113031
Step 172: 113031 + 661 = 113692
Step 173: 113692 + 661 = 114353
Step 174: 114353 + 661 = 115014
Step 175: 115014 + 661 = 115675
Step 176: 115675 + 661 = 116336
Step 177: 116336 + 661 = 116997
Step 178: 116997 + 661 = 117658
Step 179: 117658 + 661 = 118319
Step 180: 118319 + 661 = 118980
Step 181: 118980 + 661 = 119641
Step 182: 119641 + 661 = 120302
Step 183: 120302 + 661 = 120963
Step 184: 120963 + 661 = 121624
Step 185: 121624 + 661 = 122285
Step 186: 122285 + 661 = 122946
Step 187: 122946 + 661 = 123607
Step 188: 123607 + 661 = 124268
Step 189: 124268 + 661 = 124929
Step 190: 124929 + 661 = 125590
Step 191: 125590 + 661 = 126251
Step 192: 126251 + 661 = 126912
Step 193: 126912 + 661 = 127573
Step 194: 127573 + 661 = 128234
Step 195: 128234 + 661 = 128895
Step 196: 128895 + 661 = 129556
Step 197: 129556 + 661 = 130217
Step 198: 130217 + 661 = 130878
Step 199: 130878 + 661 = 131539
Step 200: 131539 + 661 = 132200
Step 201: 132200 + 661 = 132861
Step 202: 132861 + 661 = 133522
Step 203: 133522 + 661 = 134183
Step 204: 134183 + 661 = 134844
Step 205: 134844 + 661 = 135505
Step 206: 135505 + 661 = 136166
Step 207: 136166 + 661 = 136827
Step 208: 136827 + 661 = 137488
Step 209: 137488 + 661 = 138149
Step 210: 138149 + 661 = 138810
Step 211: 138810 + 661 = 139471
Step 212: 139471 + 661 = 140132
Step 213: 140132 + 661 = 140793
Step 214: 140793 + 661 = 141454
Step 215: 141454 + 661 = 142115
Step 216: 142115 + 661 = 142776
Step 217: 142776 + 661 = 143437
Step 218: 143437 + 661 = 144098
Step 219: 144098 + 661 = 144759
Step 220: 144759 + 661 = 145420
Step 221: 145420 + 661 = 146081
Step 222: 146081 + 661 = 146742
Step 223: 146742 + 661 = 147403
Step 224: 147403 + 661 = 148064
Step 225: 148064 + 661 = 148725
Step 226: 148725 + 661 = 149386
Step 227: 149386 + 661 = 150047
Step 228: 150047 + 661 = 150708
Step 229: 150708 + 661 = 151369
Step 230: 151369 + 661 = 152030
Step 231: 152030 + 661 = 152691
Step 232: 152691 + 661 = 153352
Step 233: 153352 + 661 = 154013
Step 234: 154013 + 661 = 154674
Step 235: 154674 + 661 = 155335
Step 236: 155335 + 661 = 155996
Step 237: 155996 + 661 = 156657
Step 238: 156657 + 661 = 157318
Step 239: 157318 + 661 = 157979
Step 240: 157979 + 661 = 158640
Step 241: 158640 + 661 = 159301
Step 242: 159301 + 661 = 159962
Step 243: 159962 + 661 = 160623
Step 244: 160623 + 661 = 161284
Step 245: 161284 + 661 = 161945
Step 246: 161945 + 661 = 162606
Step 247: 162606 + 661 = 163267
Step 248: 163267 + 661 = 163928
Step 249: 163928 + 661 = 164589
Step 250: 164589 + 661 = 165250
Step 251: 165250 + 661 = 165911
Step 252: 165911 + 661 = 166572
Step 253: 166572 + 661 = 167233
Step 254: 167233 + 661 = 167894
Step 255: 167894 + 661 = 168555
Step 256: 168555 + 661 = 169216
Step 257: 169216 + 661 = 169877
Step 258: 169877 + 661 = 170538
Step 259: 170538 + 661 = 171199
Step 260: 171199 + 661 = 171860
Step 261: 171860 + 661 = 172521
Step 262: 172521 + 661 = 173182
Step 263: 173182 + 661 = 173843
Step 264: 173843 + 661 = 174504
Step 265: 174504 + 661 = 175165
Step 266: 175165 + 661 = 175826
Step 267: 175826 + 661 = 176487
Step 268: 176487 + 661 = 177148
Step 269: 177148 + 661 = 177809
Step 270: 177809 + 661 = 178470
Step 271: 178470 + 661 = 179131
Step 272: 179131 + 661 = 179792
Step 273: 179792 + 661 = 180453
Step 274: 180453 + 661 = 181114
Step 275: 181114 + 661 = 181775
Step 276: 181775 + 661 = 182436
Step 277: 182436 + 661 = 183097
Step 278: 183097 + 661 = 183758
Step 279: 183758 + 661 = 184419
Step 280: 184419 + 661 = 185080
Step 281: 185080 + 661 = 185741
Step 282: 185741 + 661 = 186402
Step 283: 186402 + 661 = 187063
Step 284: 187063 + 661 = 187724
Step 285: 187724 + 661 = 188385
Step 286: 188385 + 661 = 189046
Step 287: 189046 + 661 = 189707
Step 288: 189707 + 661 = 190368
Step 289: 190368 + 661 = 191029
Step 290: 191029 + 661 = 191690
Step 291: 191690 + 661 = 192351
Step 292: 192351 + 661 = 193012
Step 293: 193012 + 661 = 193673
Step 294: 193673 + 661 = 194334
Step 295: 194334 + 661 = 194995
Step 296: 194995 + 661 = 195656
Step 297: 195656 + 661 = 196317
Step 298: 196317 + 661 = 196978
Step 299: 196978 + 661 = 197639
Step 300: 197639 + 661 = 198300
Step 301: 198300 + 661 = 198961
Step 302: 198961 + 661 = 199622
Step 303: 199622 + 661 = 200283
Step 304: 200283 + 661 = 200944
Step 305: 200944 + 661 = 201605
Step 306: 201605 + 661 = 202266
Step 307: 202266 + 661 = 202927
Step 308: 202927 + 661 = 203588
Step 309: 203588 + 661 = 204249
Step 310: 204249 + 661 = 204910
Step 311: 204910 + 661 = 205571
Step 312: 205571 + 661 = 206232
Step 313: 206232 + 661 = 206893
Step 314: 206893 + 661 = 207554
Step 315: 207554 + 661 = 208215
Step 316: 208215 + 661 = 208876
Step 317: 208876 + 661 = 209537
Step 318: 209537 + 661 = 210198
Step 319: 210198 + 661 = 210859
Step 320: 210859 + 661 = 211520
Step 321: 211520 + 661 = 212181
Step 322: 212181 + 661 = 212842
Step 323: 212842 + 661 = 213503
Step 324: 213503 + 661 = 214164
Step 325: 214164 + 661 = 214825
Step 326: 214825 + 661 = 215486
Step 327: 215486 + 661 = 216147
Step 328: 216147 + 661 = 216808
Step 329: 216808 + 661 = 217469
Step 330: 217469 + 661 = 218130
Step 331: 218130 + 661 = 218791
Step 332: 218791 + 661 = 219452
Step 333: 219452 + 661 = 220113
Step 334: 220113 + 661 = 220774
Step 335: 220774 + 661 = 221435
Step 336: 221435 + 661 = 222096
Step 337: 222096 + 661 = 222757
Step 338: 222757 + 661 = 223418
Step 339: 223418 + 661 = 224079
Step 340: 224079 + 661 = 224740
Step 341: 224740 + 661 = 225401
Step 342: 225401 + 661 = 226062
Step 343: 226062 + 661 = 226723
Step 344: 226723 + 661 = 227384
Step 345: 227384 + 661 = 228045
Step 346: 228045 + 661 = 228706
Step 347: 228706 + 661 = 229367
Step 348: 229367 + 661 = 230028

So, 661*348 = 230028