Alright, let's solve this math problem step by step. First, we have the number 661. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 320. So, we're going to take the number 661 and add it to itself 320 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

So, 661*320 = 211520