Alright, let's solve this math problem step by step. First, we have the number 105. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 407. So, we're going to take the number 105 and add it to itself 407 times.
Step 1: 0 + 105 = 105
Step 2: 105 + 105 = 210
Step 3: 210 + 105 = 315
Step 4: 315 + 105 = 420
Step 5: 420 + 105 = 525
Step 6: 525 + 105 = 630
Step 7: 630 + 105 = 735
Step 8: 735 + 105 = 840
Step 9: 840 + 105 = 945
Step 10: 945 + 105 = 1050
Step 11: 1050 + 105 = 1155
Step 12: 1155 + 105 = 1260
Step 13: 1260 + 105 = 1365
Step 14: 1365 + 105 = 1470
Step 15: 1470 + 105 = 1575
Step 16: 1575 + 105 = 1680
Step 17: 1680 + 105 = 1785
Step 18: 1785 + 105 = 1890
Step 19: 1890 + 105 = 1995
Step 20: 1995 + 105 = 2100
Step 21: 2100 + 105 = 2205
Step 22: 2205 + 105 = 2310
Step 23: 2310 + 105 = 2415
Step 24: 2415 + 105 = 2520
Step 25: 2520 + 105 = 2625
Step 26: 2625 + 105 = 2730
Step 27: 2730 + 105 = 2835
Step 28: 2835 + 105 = 2940
Step 29: 2940 + 105 = 3045
Step 30: 3045 + 105 = 3150
Step 31: 3150 + 105 = 3255
Step 32: 3255 + 105 = 3360
Step 33: 3360 + 105 = 3465
Step 34: 3465 + 105 = 3570
Step 35: 3570 + 105 = 3675
Step 36: 3675 + 105 = 3780
Step 37: 3780 + 105 = 3885
Step 38: 3885 + 105 = 3990
Step 39: 3990 + 105 = 4095
Step 40: 4095 + 105 = 4200
Step 41: 4200 + 105 = 4305
Step 42: 4305 + 105 = 4410
Step 43: 4410 + 105 = 4515
Step 44: 4515 + 105 = 4620
Step 45: 4620 + 105 = 4725
Step 46: 4725 + 105 = 4830
Step 47: 4830 + 105 = 4935
Step 48: 4935 + 105 = 5040
Step 49: 5040 + 105 = 5145
Step 50: 5145 + 105 = 5250
Step 51: 5250 + 105 = 5355
Step 52: 5355 + 105 = 5460
Step 53: 5460 + 105 = 5565
Step 54: 5565 + 105 = 5670
Step 55: 5670 + 105 = 5775
Step 56: 5775 + 105 = 5880
Step 57: 5880 + 105 = 5985
Step 58: 5985 + 105 = 6090
Step 59: 6090 + 105 = 6195
Step 60: 6195 + 105 = 6300
Step 61: 6300 + 105 = 6405
Step 62: 6405 + 105 = 6510
Step 63: 6510 + 105 = 6615
Step 64: 6615 + 105 = 6720
Step 65: 6720 + 105 = 6825
Step 66: 6825 + 105 = 6930
Step 67: 6930 + 105 = 7035
Step 68: 7035 + 105 = 7140
Step 69: 7140 + 105 = 7245
Step 70: 7245 + 105 = 7350
Step 71: 7350 + 105 = 7455
Step 72: 7455 + 105 = 7560
Step 73: 7560 + 105 = 7665
Step 74: 7665 + 105 = 7770
Step 75: 7770 + 105 = 7875
Step 76: 7875 + 105 = 7980
Step 77: 7980 + 105 = 8085
Step 78: 8085 + 105 = 8190
Step 79: 8190 + 105 = 8295
Step 80: 8295 + 105 = 8400
Step 81: 8400 + 105 = 8505
Step 82: 8505 + 105 = 8610
Step 83: 8610 + 105 = 8715
Step 84: 8715 + 105 = 8820
Step 85: 8820 + 105 = 8925
Step 86: 8925 + 105 = 9030
Step 87: 9030 + 105 = 9135
Step 88: 9135 + 105 = 9240
Step 89: 9240 + 105 = 9345
Step 90: 9345 + 105 = 9450
Step 91: 9450 + 105 = 9555
Step 92: 9555 + 105 = 9660
Step 93: 9660 + 105 = 9765
Step 94: 9765 + 105 = 9870
Step 95: 9870 + 105 = 9975
Step 96: 9975 + 105 = 10080
Step 97: 10080 + 105 = 10185
Step 98: 10185 + 105 = 10290
Step 99: 10290 + 105 = 10395
Step 100: 10395 + 105 = 10500
Step 101: 10500 + 105 = 10605
Step 102: 10605 + 105 = 10710
Step 103: 10710 + 105 = 10815
Step 104: 10815 + 105 = 10920
Step 105: 10920 + 105 = 11025
Step 106: 11025 + 105 = 11130
Step 107: 11130 + 105 = 11235
Step 108: 11235 + 105 = 11340
Step 109: 11340 + 105 = 11445
Step 110: 11445 + 105 = 11550
Step 111: 11550 + 105 = 11655
Step 112: 11655 + 105 = 11760
Step 113: 11760 + 105 = 11865
Step 114: 11865 + 105 = 11970
Step 115: 11970 + 105 = 12075
Step 116: 12075 + 105 = 12180
Step 117: 12180 + 105 = 12285
Step 118: 12285 + 105 = 12390
Step 119: 12390 + 105 = 12495
Step 120: 12495 + 105 = 12600
Step 121: 12600 + 105 = 12705
Step 122: 12705 + 105 = 12810
Step 123: 12810 + 105 = 12915
Step 124: 12915 + 105 = 13020
Step 125: 13020 + 105 = 13125
Step 126: 13125 + 105 = 13230
Step 127: 13230 + 105 = 13335
Step 128: 13335 + 105 = 13440
Step 129: 13440 + 105 = 13545
Step 130: 13545 + 105 = 13650
Step 131: 13650 + 105 = 13755
Step 132: 13755 + 105 = 13860
Step 133: 13860 + 105 = 13965
Step 134: 13965 + 105 = 14070
Step 135: 14070 + 105 = 14175
Step 136: 14175 + 105 = 14280
Step 137: 14280 + 105 = 14385
Step 138: 14385 + 105 = 14490
Step 139: 14490 + 105 = 14595
Step 140: 14595 + 105 = 14700
Step 141: 14700 + 105 = 14805
Step 142: 14805 + 105 = 14910
Step 143: 14910 + 105 = 15015
Step 144: 15015 + 105 = 15120
Step 145: 15120 + 105 = 15225
Step 146: 15225 + 105 = 15330
Step 147: 15330 + 105 = 15435
Step 148: 15435 + 105 = 15540
Step 149: 15540 + 105 = 15645
Step 150: 15645 + 105 = 15750
Step 151: 15750 + 105 = 15855
Step 152: 15855 + 105 = 15960
Step 153: 15960 + 105 = 16065
Step 154: 16065 + 105 = 16170
Step 155: 16170 + 105 = 16275
Step 156: 16275 + 105 = 16380
Step 157: 16380 + 105 = 16485
Step 158: 16485 + 105 = 16590
Step 159: 16590 + 105 = 16695
Step 160: 16695 + 105 = 16800
Step 161: 16800 + 105 = 16905
Step 162: 16905 + 105 = 17010
Step 163: 17010 + 105 = 17115
Step 164: 17115 + 105 = 17220
Step 165: 17220 + 105 = 17325
Step 166: 17325 + 105 = 17430
Step 167: 17430 + 105 = 17535
Step 168: 17535 + 105 = 17640
Step 169: 17640 + 105 = 17745
Step 170: 17745 + 105 = 17850
Step 171: 17850 + 105 = 17955
Step 172: 17955 + 105 = 18060
Step 173: 18060 + 105 = 18165
Step 174: 18165 + 105 = 18270
Step 175: 18270 + 105 = 18375
Step 176: 18375 + 105 = 18480
Step 177: 18480 + 105 = 18585
Step 178: 18585 + 105 = 18690
Step 179: 18690 + 105 = 18795
Step 180: 18795 + 105 = 18900
Step 181: 18900 + 105 = 19005
Step 182: 19005 + 105 = 19110
Step 183: 19110 + 105 = 19215
Step 184: 19215 + 105 = 19320
Step 185: 19320 + 105 = 19425
Step 186: 19425 + 105 = 19530
Step 187: 19530 + 105 = 19635
Step 188: 19635 + 105 = 19740
Step 189: 19740 + 105 = 19845
Step 190: 19845 + 105 = 19950
Step 191: 19950 + 105 = 20055
Step 192: 20055 + 105 = 20160
Step 193: 20160 + 105 = 20265
Step 194: 20265 + 105 = 20370
Step 195: 20370 + 105 = 20475
Step 196: 20475 + 105 = 20580
Step 197: 20580 + 105 = 20685
Step 198: 20685 + 105 = 20790
Step 199: 20790 + 105 = 20895
Step 200: 20895 + 105 = 21000
Step 201: 21000 + 105 = 21105
Step 202: 21105 + 105 = 21210
Step 203: 21210 + 105 = 21315
Step 204: 21315 + 105 = 21420
Step 205: 21420 + 105 = 21525
Step 206: 21525 + 105 = 21630
Step 207: 21630 + 105 = 21735
Step 208: 21735 + 105 = 21840
Step 209: 21840 + 105 = 21945
Step 210: 21945 + 105 = 22050
Step 211: 22050 + 105 = 22155
Step 212: 22155 + 105 = 22260
Step 213: 22260 + 105 = 22365
Step 214: 22365 + 105 = 22470
Step 215: 22470 + 105 = 22575
Step 216: 22575 + 105 = 22680
Step 217: 22680 + 105 = 22785
Step 218: 22785 + 105 = 22890
Step 219: 22890 + 105 = 22995
Step 220: 22995 + 105 = 23100
Step 221: 23100 + 105 = 23205
Step 222: 23205 + 105 = 23310
Step 223: 23310 + 105 = 23415
Step 224: 23415 + 105 = 23520
Step 225: 23520 + 105 = 23625
Step 226: 23625 + 105 = 23730
Step 227: 23730 + 105 = 23835
Step 228: 23835 + 105 = 23940
Step 229: 23940 + 105 = 24045
Step 230: 24045 + 105 = 24150
Step 231: 24150 + 105 = 24255
Step 232: 24255 + 105 = 24360
Step 233: 24360 + 105 = 24465
Step 234: 24465 + 105 = 24570
Step 235: 24570 + 105 = 24675
Step 236: 24675 + 105 = 24780
Step 237: 24780 + 105 = 24885
Step 238: 24885 + 105 = 24990
Step 239: 24990 + 105 = 25095
Step 240: 25095 + 105 = 25200
Step 241: 25200 + 105 = 25305
Step 242: 25305 + 105 = 25410
Step 243: 25410 + 105 = 25515
Step 244: 25515 + 105 = 25620
Step 245: 25620 + 105 = 25725
Step 246: 25725 + 105 = 25830
Step 247: 25830 + 105 = 25935
Step 248: 25935 + 105 = 26040
Step 249: 26040 + 105 = 26145
Step 250: 26145 + 105 = 26250
Step 251: 26250 + 105 = 26355
Step 252: 26355 + 105 = 26460
Step 253: 26460 + 105 = 26565
Step 254: 26565 + 105 = 26670
Step 255: 26670 + 105 = 26775
Step 256: 26775 + 105 = 26880
Step 257: 26880 + 105 = 26985
Step 258: 26985 + 105 = 27090
Step 259: 27090 + 105 = 27195
Step 260: 27195 + 105 = 27300
Step 261: 27300 + 105 = 27405
Step 262: 27405 + 105 = 27510
Step 263: 27510 + 105 = 27615
Step 264: 27615 + 105 = 27720
Step 265: 27720 + 105 = 27825
Step 266: 27825 + 105 = 27930
Step 267: 27930 + 105 = 28035
Step 268: 28035 + 105 = 28140
Step 269: 28140 + 105 = 28245
Step 270: 28245 + 105 = 28350
Step 271: 28350 + 105 = 28455
Step 272: 28455 + 105 = 28560
Step 273: 28560 + 105 = 28665
Step 274: 28665 + 105 = 28770
Step 275: 28770 + 105 = 28875
Step 276: 28875 + 105 = 28980
Step 277: 28980 + 105 = 29085
Step 278: 29085 + 105 = 29190
Step 279: 29190 + 105 = 29295
Step 280: 29295 + 105 = 29400
Step 281: 29400 + 105 = 29505
Step 282: 29505 + 105 = 29610
Step 283: 29610 + 105 = 29715
Step 284: 29715 + 105 = 29820
Step 285: 29820 + 105 = 29925
Step 286: 29925 + 105 = 30030
Step 287: 30030 + 105 = 30135
Step 288: 30135 + 105 = 30240
Step 289: 30240 + 105 = 30345
Step 290: 30345 + 105 = 30450
Step 291: 30450 + 105 = 30555
Step 292: 30555 + 105 = 30660
Step 293: 30660 + 105 = 30765
Step 294: 30765 + 105 = 30870
Step 295: 30870 + 105 = 30975
Step 296: 30975 + 105 = 31080
Step 297: 31080 + 105 = 31185
Step 298: 31185 + 105 = 31290
Step 299: 31290 + 105 = 31395
Step 300: 31395 + 105 = 31500
Step 301: 31500 + 105 = 31605
Step 302: 31605 + 105 = 31710
Step 303: 31710 + 105 = 31815
Step 304: 31815 + 105 = 31920
Step 305: 31920 + 105 = 32025
Step 306: 32025 + 105 = 32130
Step 307: 32130 + 105 = 32235
Step 308: 32235 + 105 = 32340
Step 309: 32340 + 105 = 32445
Step 310: 32445 + 105 = 32550
Step 311: 32550 + 105 = 32655
Step 312: 32655 + 105 = 32760
Step 313: 32760 + 105 = 32865
Step 314: 32865 + 105 = 32970
Step 315: 32970 + 105 = 33075
Step 316: 33075 + 105 = 33180
Step 317: 33180 + 105 = 33285
Step 318: 33285 + 105 = 33390
Step 319: 33390 + 105 = 33495
Step 320: 33495 + 105 = 33600
Step 321: 33600 + 105 = 33705
Step 322: 33705 + 105 = 33810
Step 323: 33810 + 105 = 33915
Step 324: 33915 + 105 = 34020
Step 325: 34020 + 105 = 34125
Step 326: 34125 + 105 = 34230
Step 327: 34230 + 105 = 34335
Step 328: 34335 + 105 = 34440
Step 329: 34440 + 105 = 34545
Step 330: 34545 + 105 = 34650
Step 331: 34650 + 105 = 34755
Step 332: 34755 + 105 = 34860
Step 333: 34860 + 105 = 34965
Step 334: 34965 + 105 = 35070
Step 335: 35070 + 105 = 35175
Step 336: 35175 + 105 = 35280
Step 337: 35280 + 105 = 35385
Step 338: 35385 + 105 = 35490
Step 339: 35490 + 105 = 35595
Step 340: 35595 + 105 = 35700
Step 341: 35700 + 105 = 35805
Step 342: 35805 + 105 = 35910
Step 343: 35910 + 105 = 36015
Step 344: 36015 + 105 = 36120
Step 345: 36120 + 105 = 36225
Step 346: 36225 + 105 = 36330
Step 347: 36330 + 105 = 36435
Step 348: 36435 + 105 = 36540
Step 349: 36540 + 105 = 36645
Step 350: 36645 + 105 = 36750
Step 351: 36750 + 105 = 36855
Step 352: 36855 + 105 = 36960
Step 353: 36960 + 105 = 37065
Step 354: 37065 + 105 = 37170
Step 355: 37170 + 105 = 37275
Step 356: 37275 + 105 = 37380
Step 357: 37380 + 105 = 37485
Step 358: 37485 + 105 = 37590
Step 359: 37590 + 105 = 37695
Step 360: 37695 + 105 = 37800
Step 361: 37800 + 105 = 37905
Step 362: 37905 + 105 = 38010
Step 363: 38010 + 105 = 38115
Step 364: 38115 + 105 = 38220
Step 365: 38220 + 105 = 38325
Step 366: 38325 + 105 = 38430
Step 367: 38430 + 105 = 38535
Step 368: 38535 + 105 = 38640
Step 369: 38640 + 105 = 38745
Step 370: 38745 + 105 = 38850
Step 371: 38850 + 105 = 38955
Step 372: 38955 + 105 = 39060
Step 373: 39060 + 105 = 39165
Step 374: 39165 + 105 = 39270
Step 375: 39270 + 105 = 39375
Step 376: 39375 + 105 = 39480
Step 377: 39480 + 105 = 39585
Step 378: 39585 + 105 = 39690
Step 379: 39690 + 105 = 39795
Step 380: 39795 + 105 = 39900
Step 381: 39900 + 105 = 40005
Step 382: 40005 + 105 = 40110
Step 383: 40110 + 105 = 40215
Step 384: 40215 + 105 = 40320
Step 385: 40320 + 105 = 40425
Step 386: 40425 + 105 = 40530
Step 387: 40530 + 105 = 40635
Step 388: 40635 + 105 = 40740
Step 389: 40740 + 105 = 40845
Step 390: 40845 + 105 = 40950
Step 391: 40950 + 105 = 41055
Step 392: 41055 + 105 = 41160
Step 393: 41160 + 105 = 41265
Step 394: 41265 + 105 = 41370
Step 395: 41370 + 105 = 41475
Step 396: 41475 + 105 = 41580
Step 397: 41580 + 105 = 41685
Step 398: 41685 + 105 = 41790
Step 399: 41790 + 105 = 41895
Step 400: 41895 + 105 = 42000
Step 401: 42000 + 105 = 42105
Step 402: 42105 + 105 = 42210
Step 403: 42210 + 105 = 42315
Step 404: 42315 + 105 = 42420
Step 405: 42420 + 105 = 42525
Step 406: 42525 + 105 = 42630
Step 407: 42630 + 105 = 42735

So, 105*407 = 42735