Alright, let's solve this math problem step by step. First, we have the number 664. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 408. So, we're going to take the number 664 and add it to itself 408 times.
Step 1: 0 + 664 = 664
Step 2: 664 + 664 = 1328
Step 3: 1328 + 664 = 1992
Step 4: 1992 + 664 = 2656
Step 5: 2656 + 664 = 3320
Step 6: 3320 + 664 = 3984
Step 7: 3984 + 664 = 4648
Step 8: 4648 + 664 = 5312
Step 9: 5312 + 664 = 5976
Step 10: 5976 + 664 = 6640
Step 11: 6640 + 664 = 7304
Step 12: 7304 + 664 = 7968
Step 13: 7968 + 664 = 8632
Step 14: 8632 + 664 = 9296
Step 15: 9296 + 664 = 9960
Step 16: 9960 + 664 = 10624
Step 17: 10624 + 664 = 11288
Step 18: 11288 + 664 = 11952
Step 19: 11952 + 664 = 12616
Step 20: 12616 + 664 = 13280
Step 21: 13280 + 664 = 13944
Step 22: 13944 + 664 = 14608
Step 23: 14608 + 664 = 15272
Step 24: 15272 + 664 = 15936
Step 25: 15936 + 664 = 16600
Step 26: 16600 + 664 = 17264
Step 27: 17264 + 664 = 17928
Step 28: 17928 + 664 = 18592
Step 29: 18592 + 664 = 19256
Step 30: 19256 + 664 = 19920
Step 31: 19920 + 664 = 20584
Step 32: 20584 + 664 = 21248
Step 33: 21248 + 664 = 21912
Step 34: 21912 + 664 = 22576
Step 35: 22576 + 664 = 23240
Step 36: 23240 + 664 = 23904
Step 37: 23904 + 664 = 24568
Step 38: 24568 + 664 = 25232
Step 39: 25232 + 664 = 25896
Step 40: 25896 + 664 = 26560
Step 41: 26560 + 664 = 27224
Step 42: 27224 + 664 = 27888
Step 43: 27888 + 664 = 28552
Step 44: 28552 + 664 = 29216
Step 45: 29216 + 664 = 29880
Step 46: 29880 + 664 = 30544
Step 47: 30544 + 664 = 31208
Step 48: 31208 + 664 = 31872
Step 49: 31872 + 664 = 32536
Step 50: 32536 + 664 = 33200
Step 51: 33200 + 664 = 33864
Step 52: 33864 + 664 = 34528
Step 53: 34528 + 664 = 35192
Step 54: 35192 + 664 = 35856
Step 55: 35856 + 664 = 36520
Step 56: 36520 + 664 = 37184
Step 57: 37184 + 664 = 37848
Step 58: 37848 + 664 = 38512
Step 59: 38512 + 664 = 39176
Step 60: 39176 + 664 = 39840
Step 61: 39840 + 664 = 40504
Step 62: 40504 + 664 = 41168
Step 63: 41168 + 664 = 41832
Step 64: 41832 + 664 = 42496
Step 65: 42496 + 664 = 43160
Step 66: 43160 + 664 = 43824
Step 67: 43824 + 664 = 44488
Step 68: 44488 + 664 = 45152
Step 69: 45152 + 664 = 45816
Step 70: 45816 + 664 = 46480
Step 71: 46480 + 664 = 47144
Step 72: 47144 + 664 = 47808
Step 73: 47808 + 664 = 48472
Step 74: 48472 + 664 = 49136
Step 75: 49136 + 664 = 49800
Step 76: 49800 + 664 = 50464
Step 77: 50464 + 664 = 51128
Step 78: 51128 + 664 = 51792
Step 79: 51792 + 664 = 52456
Step 80: 52456 + 664 = 53120
Step 81: 53120 + 664 = 53784
Step 82: 53784 + 664 = 54448
Step 83: 54448 + 664 = 55112
Step 84: 55112 + 664 = 55776
Step 85: 55776 + 664 = 56440
Step 86: 56440 + 664 = 57104
Step 87: 57104 + 664 = 57768
Step 88: 57768 + 664 = 58432
Step 89: 58432 + 664 = 59096
Step 90: 59096 + 664 = 59760
Step 91: 59760 + 664 = 60424
Step 92: 60424 + 664 = 61088
Step 93: 61088 + 664 = 61752
Step 94: 61752 + 664 = 62416
Step 95: 62416 + 664 = 63080
Step 96: 63080 + 664 = 63744
Step 97: 63744 + 664 = 64408
Step 98: 64408 + 664 = 65072
Step 99: 65072 + 664 = 65736
Step 100: 65736 + 664 = 66400
Step 101: 66400 + 664 = 67064
Step 102: 67064 + 664 = 67728
Step 103: 67728 + 664 = 68392
Step 104: 68392 + 664 = 69056
Step 105: 69056 + 664 = 69720
Step 106: 69720 + 664 = 70384
Step 107: 70384 + 664 = 71048
Step 108: 71048 + 664 = 71712
Step 109: 71712 + 664 = 72376
Step 110: 72376 + 664 = 73040
Step 111: 73040 + 664 = 73704
Step 112: 73704 + 664 = 74368
Step 113: 74368 + 664 = 75032
Step 114: 75032 + 664 = 75696
Step 115: 75696 + 664 = 76360
Step 116: 76360 + 664 = 77024
Step 117: 77024 + 664 = 77688
Step 118: 77688 + 664 = 78352
Step 119: 78352 + 664 = 79016
Step 120: 79016 + 664 = 79680
Step 121: 79680 + 664 = 80344
Step 122: 80344 + 664 = 81008
Step 123: 81008 + 664 = 81672
Step 124: 81672 + 664 = 82336
Step 125: 82336 + 664 = 83000
Step 126: 83000 + 664 = 83664
Step 127: 83664 + 664 = 84328
Step 128: 84328 + 664 = 84992
Step 129: 84992 + 664 = 85656
Step 130: 85656 + 664 = 86320
Step 131: 86320 + 664 = 86984
Step 132: 86984 + 664 = 87648
Step 133: 87648 + 664 = 88312
Step 134: 88312 + 664 = 88976
Step 135: 88976 + 664 = 89640
Step 136: 89640 + 664 = 90304
Step 137: 90304 + 664 = 90968
Step 138: 90968 + 664 = 91632
Step 139: 91632 + 664 = 92296
Step 140: 92296 + 664 = 92960
Step 141: 92960 + 664 = 93624
Step 142: 93624 + 664 = 94288
Step 143: 94288 + 664 = 94952
Step 144: 94952 + 664 = 95616
Step 145: 95616 + 664 = 96280
Step 146: 96280 + 664 = 96944
Step 147: 96944 + 664 = 97608
Step 148: 97608 + 664 = 98272
Step 149: 98272 + 664 = 98936
Step 150: 98936 + 664 = 99600
Step 151: 99600 + 664 = 100264
Step 152: 100264 + 664 = 100928
Step 153: 100928 + 664 = 101592
Step 154: 101592 + 664 = 102256
Step 155: 102256 + 664 = 102920
Step 156: 102920 + 664 = 103584
Step 157: 103584 + 664 = 104248
Step 158: 104248 + 664 = 104912
Step 159: 104912 + 664 = 105576
Step 160: 105576 + 664 = 106240
Step 161: 106240 + 664 = 106904
Step 162: 106904 + 664 = 107568
Step 163: 107568 + 664 = 108232
Step 164: 108232 + 664 = 108896
Step 165: 108896 + 664 = 109560
Step 166: 109560 + 664 = 110224
Step 167: 110224 + 664 = 110888
Step 168: 110888 + 664 = 111552
Step 169: 111552 + 664 = 112216
Step 170: 112216 + 664 = 112880
Step 171: 112880 + 664 = 113544
Step 172: 113544 + 664 = 114208
Step 173: 114208 + 664 = 114872
Step 174: 114872 + 664 = 115536
Step 175: 115536 + 664 = 116200
Step 176: 116200 + 664 = 116864
Step 177: 116864 + 664 = 117528
Step 178: 117528 + 664 = 118192
Step 179: 118192 + 664 = 118856
Step 180: 118856 + 664 = 119520
Step 181: 119520 + 664 = 120184
Step 182: 120184 + 664 = 120848
Step 183: 120848 + 664 = 121512
Step 184: 121512 + 664 = 122176
Step 185: 122176 + 664 = 122840
Step 186: 122840 + 664 = 123504
Step 187: 123504 + 664 = 124168
Step 188: 124168 + 664 = 124832
Step 189: 124832 + 664 = 125496
Step 190: 125496 + 664 = 126160
Step 191: 126160 + 664 = 126824
Step 192: 126824 + 664 = 127488
Step 193: 127488 + 664 = 128152
Step 194: 128152 + 664 = 128816
Step 195: 128816 + 664 = 129480
Step 196: 129480 + 664 = 130144
Step 197: 130144 + 664 = 130808
Step 198: 130808 + 664 = 131472
Step 199: 131472 + 664 = 132136
Step 200: 132136 + 664 = 132800
Step 201: 132800 + 664 = 133464
Step 202: 133464 + 664 = 134128
Step 203: 134128 + 664 = 134792
Step 204: 134792 + 664 = 135456
Step 205: 135456 + 664 = 136120
Step 206: 136120 + 664 = 136784
Step 207: 136784 + 664 = 137448
Step 208: 137448 + 664 = 138112
Step 209: 138112 + 664 = 138776
Step 210: 138776 + 664 = 139440
Step 211: 139440 + 664 = 140104
Step 212: 140104 + 664 = 140768
Step 213: 140768 + 664 = 141432
Step 214: 141432 + 664 = 142096
Step 215: 142096 + 664 = 142760
Step 216: 142760 + 664 = 143424
Step 217: 143424 + 664 = 144088
Step 218: 144088 + 664 = 144752
Step 219: 144752 + 664 = 145416
Step 220: 145416 + 664 = 146080
Step 221: 146080 + 664 = 146744
Step 222: 146744 + 664 = 147408
Step 223: 147408 + 664 = 148072
Step 224: 148072 + 664 = 148736
Step 225: 148736 + 664 = 149400
Step 226: 149400 + 664 = 150064
Step 227: 150064 + 664 = 150728
Step 228: 150728 + 664 = 151392
Step 229: 151392 + 664 = 152056
Step 230: 152056 + 664 = 152720
Step 231: 152720 + 664 = 153384
Step 232: 153384 + 664 = 154048
Step 233: 154048 + 664 = 154712
Step 234: 154712 + 664 = 155376
Step 235: 155376 + 664 = 156040
Step 236: 156040 + 664 = 156704
Step 237: 156704 + 664 = 157368
Step 238: 157368 + 664 = 158032
Step 239: 158032 + 664 = 158696
Step 240: 158696 + 664 = 159360
Step 241: 159360 + 664 = 160024
Step 242: 160024 + 664 = 160688
Step 243: 160688 + 664 = 161352
Step 244: 161352 + 664 = 162016
Step 245: 162016 + 664 = 162680
Step 246: 162680 + 664 = 163344
Step 247: 163344 + 664 = 164008
Step 248: 164008 + 664 = 164672
Step 249: 164672 + 664 = 165336
Step 250: 165336 + 664 = 166000
Step 251: 166000 + 664 = 166664
Step 252: 166664 + 664 = 167328
Step 253: 167328 + 664 = 167992
Step 254: 167992 + 664 = 168656
Step 255: 168656 + 664 = 169320
Step 256: 169320 + 664 = 169984
Step 257: 169984 + 664 = 170648
Step 258: 170648 + 664 = 171312
Step 259: 171312 + 664 = 171976
Step 260: 171976 + 664 = 172640
Step 261: 172640 + 664 = 173304
Step 262: 173304 + 664 = 173968
Step 263: 173968 + 664 = 174632
Step 264: 174632 + 664 = 175296
Step 265: 175296 + 664 = 175960
Step 266: 175960 + 664 = 176624
Step 267: 176624 + 664 = 177288
Step 268: 177288 + 664 = 177952
Step 269: 177952 + 664 = 178616
Step 270: 178616 + 664 = 179280
Step 271: 179280 + 664 = 179944
Step 272: 179944 + 664 = 180608
Step 273: 180608 + 664 = 181272
Step 274: 181272 + 664 = 181936
Step 275: 181936 + 664 = 182600
Step 276: 182600 + 664 = 183264
Step 277: 183264 + 664 = 183928
Step 278: 183928 + 664 = 184592
Step 279: 184592 + 664 = 185256
Step 280: 185256 + 664 = 185920
Step 281: 185920 + 664 = 186584
Step 282: 186584 + 664 = 187248
Step 283: 187248 + 664 = 187912
Step 284: 187912 + 664 = 188576
Step 285: 188576 + 664 = 189240
Step 286: 189240 + 664 = 189904
Step 287: 189904 + 664 = 190568
Step 288: 190568 + 664 = 191232
Step 289: 191232 + 664 = 191896
Step 290: 191896 + 664 = 192560
Step 291: 192560 + 664 = 193224
Step 292: 193224 + 664 = 193888
Step 293: 193888 + 664 = 194552
Step 294: 194552 + 664 = 195216
Step 295: 195216 + 664 = 195880
Step 296: 195880 + 664 = 196544
Step 297: 196544 + 664 = 197208
Step 298: 197208 + 664 = 197872
Step 299: 197872 + 664 = 198536
Step 300: 198536 + 664 = 199200
Step 301: 199200 + 664 = 199864
Step 302: 199864 + 664 = 200528
Step 303: 200528 + 664 = 201192
Step 304: 201192 + 664 = 201856
Step 305: 201856 + 664 = 202520
Step 306: 202520 + 664 = 203184
Step 307: 203184 + 664 = 203848
Step 308: 203848 + 664 = 204512
Step 309: 204512 + 664 = 205176
Step 310: 205176 + 664 = 205840
Step 311: 205840 + 664 = 206504
Step 312: 206504 + 664 = 207168
Step 313: 207168 + 664 = 207832
Step 314: 207832 + 664 = 208496
Step 315: 208496 + 664 = 209160
Step 316: 209160 + 664 = 209824
Step 317: 209824 + 664 = 210488
Step 318: 210488 + 664 = 211152
Step 319: 211152 + 664 = 211816
Step 320: 211816 + 664 = 212480
Step 321: 212480 + 664 = 213144
Step 322: 213144 + 664 = 213808
Step 323: 213808 + 664 = 214472
Step 324: 214472 + 664 = 215136
Step 325: 215136 + 664 = 215800
Step 326: 215800 + 664 = 216464
Step 327: 216464 + 664 = 217128
Step 328: 217128 + 664 = 217792
Step 329: 217792 + 664 = 218456
Step 330: 218456 + 664 = 219120
Step 331: 219120 + 664 = 219784
Step 332: 219784 + 664 = 220448
Step 333: 220448 + 664 = 221112
Step 334: 221112 + 664 = 221776
Step 335: 221776 + 664 = 222440
Step 336: 222440 + 664 = 223104
Step 337: 223104 + 664 = 223768
Step 338: 223768 + 664 = 224432
Step 339: 224432 + 664 = 225096
Step 340: 225096 + 664 = 225760
Step 341: 225760 + 664 = 226424
Step 342: 226424 + 664 = 227088
Step 343: 227088 + 664 = 227752
Step 344: 227752 + 664 = 228416
Step 345: 228416 + 664 = 229080
Step 346: 229080 + 664 = 229744
Step 347: 229744 + 664 = 230408
Step 348: 230408 + 664 = 231072
Step 349: 231072 + 664 = 231736
Step 350: 231736 + 664 = 232400
Step 351: 232400 + 664 = 233064
Step 352: 233064 + 664 = 233728
Step 353: 233728 + 664 = 234392
Step 354: 234392 + 664 = 235056
Step 355: 235056 + 664 = 235720
Step 356: 235720 + 664 = 236384
Step 357: 236384 + 664 = 237048
Step 358: 237048 + 664 = 237712
Step 359: 237712 + 664 = 238376
Step 360: 238376 + 664 = 239040
Step 361: 239040 + 664 = 239704
Step 362: 239704 + 664 = 240368
Step 363: 240368 + 664 = 241032
Step 364: 241032 + 664 = 241696
Step 365: 241696 + 664 = 242360
Step 366: 242360 + 664 = 243024
Step 367: 243024 + 664 = 243688
Step 368: 243688 + 664 = 244352
Step 369: 244352 + 664 = 245016
Step 370: 245016 + 664 = 245680
Step 371: 245680 + 664 = 246344
Step 372: 246344 + 664 = 247008
Step 373: 247008 + 664 = 247672
Step 374: 247672 + 664 = 248336
Step 375: 248336 + 664 = 249000
Step 376: 249000 + 664 = 249664
Step 377: 249664 + 664 = 250328
Step 378: 250328 + 664 = 250992
Step 379: 250992 + 664 = 251656
Step 380: 251656 + 664 = 252320
Step 381: 252320 + 664 = 252984
Step 382: 252984 + 664 = 253648
Step 383: 253648 + 664 = 254312
Step 384: 254312 + 664 = 254976
Step 385: 254976 + 664 = 255640
Step 386: 255640 + 664 = 256304
Step 387: 256304 + 664 = 256968
Step 388: 256968 + 664 = 257632
Step 389: 257632 + 664 = 258296
Step 390: 258296 + 664 = 258960
Step 391: 258960 + 664 = 259624
Step 392: 259624 + 664 = 260288
Step 393: 260288 + 664 = 260952
Step 394: 260952 + 664 = 261616
Step 395: 261616 + 664 = 262280
Step 396: 262280 + 664 = 262944
Step 397: 262944 + 664 = 263608
Step 398: 263608 + 664 = 264272
Step 399: 264272 + 664 = 264936
Step 400: 264936 + 664 = 265600
Step 401: 265600 + 664 = 266264
Step 402: 266264 + 664 = 266928
Step 403: 266928 + 664 = 267592
Step 404: 267592 + 664 = 268256
Step 405: 268256 + 664 = 268920
Step 406: 268920 + 664 = 269584
Step 407: 269584 + 664 = 270248
Step 408: 270248 + 664 = 270912

So, 664*408 = 270912