OK, let's work through this together. We're starting with 104 and we're going to multiply it by 410, which means we add 104 to itself 410 times.
Step 1: 0 + 104 = 104
Step 2: 104 + 104 = 208
Step 3: 208 + 104 = 312
Step 4: 312 + 104 = 416
Step 5: 416 + 104 = 520
Step 6: 520 + 104 = 624
Step 7: 624 + 104 = 728
Step 8: 728 + 104 = 832
Step 9: 832 + 104 = 936
Step 10: 936 + 104 = 1040
Step 11: 1040 + 104 = 1144
Step 12: 1144 + 104 = 1248
Step 13: 1248 + 104 = 1352
Step 14: 1352 + 104 = 1456
Step 15: 1456 + 104 = 1560
Step 16: 1560 + 104 = 1664
Step 17: 1664 + 104 = 1768
Step 18: 1768 + 104 = 1872
Step 19: 1872 + 104 = 1976
Step 20: 1976 + 104 = 2080
Step 21: 2080 + 104 = 2184
Step 22: 2184 + 104 = 2288
Step 23: 2288 + 104 = 2392
Step 24: 2392 + 104 = 2496
Step 25: 2496 + 104 = 2600
Step 26: 2600 + 104 = 2704
Step 27: 2704 + 104 = 2808
Step 28: 2808 + 104 = 2912
Step 29: 2912 + 104 = 3016
Step 30: 3016 + 104 = 3120
Step 31: 3120 + 104 = 3224
Step 32: 3224 + 104 = 3328
Step 33: 3328 + 104 = 3432
Step 34: 3432 + 104 = 3536
Step 35: 3536 + 104 = 3640
Step 36: 3640 + 104 = 3744
Step 37: 3744 + 104 = 3848
Step 38: 3848 + 104 = 3952
Step 39: 3952 + 104 = 4056
Step 40: 4056 + 104 = 4160
Step 41: 4160 + 104 = 4264
Step 42: 4264 + 104 = 4368
Step 43: 4368 + 104 = 4472
Step 44: 4472 + 104 = 4576
Step 45: 4576 + 104 = 4680
Step 46: 4680 + 104 = 4784
Step 47: 4784 + 104 = 4888
Step 48: 4888 + 104 = 4992
Step 49: 4992 + 104 = 5096
Step 50: 5096 + 104 = 5200
Step 51: 5200 + 104 = 5304
Step 52: 5304 + 104 = 5408
Step 53: 5408 + 104 = 5512
Step 54: 5512 + 104 = 5616
Step 55: 5616 + 104 = 5720
Step 56: 5720 + 104 = 5824
Step 57: 5824 + 104 = 5928
Step 58: 5928 + 104 = 6032
Step 59: 6032 + 104 = 6136
Step 60: 6136 + 104 = 6240
Step 61: 6240 + 104 = 6344
Step 62: 6344 + 104 = 6448
Step 63: 6448 + 104 = 6552
Step 64: 6552 + 104 = 6656
Step 65: 6656 + 104 = 6760
Step 66: 6760 + 104 = 6864
Step 67: 6864 + 104 = 6968
Step 68: 6968 + 104 = 7072
Step 69: 7072 + 104 = 7176
Step 70: 7176 + 104 = 7280
Step 71: 7280 + 104 = 7384
Step 72: 7384 + 104 = 7488
Step 73: 7488 + 104 = 7592
Step 74: 7592 + 104 = 7696
Step 75: 7696 + 104 = 7800
Step 76: 7800 + 104 = 7904
Step 77: 7904 + 104 = 8008
Step 78: 8008 + 104 = 8112
Step 79: 8112 + 104 = 8216
Step 80: 8216 + 104 = 8320
Step 81: 8320 + 104 = 8424
Step 82: 8424 + 104 = 8528
Step 83: 8528 + 104 = 8632
Step 84: 8632 + 104 = 8736
Step 85: 8736 + 104 = 8840
Step 86: 8840 + 104 = 8944
Step 87: 8944 + 104 = 9048
Step 88: 9048 + 104 = 9152
Step 89: 9152 + 104 = 9256
Step 90: 9256 + 104 = 9360
Step 91: 9360 + 104 = 9464
Step 92: 9464 + 104 = 9568
Step 93: 9568 + 104 = 9672
Step 94: 9672 + 104 = 9776
Step 95: 9776 + 104 = 9880
Step 96: 9880 + 104 = 9984
Step 97: 9984 + 104 = 10088
Step 98: 10088 + 104 = 10192
Step 99: 10192 + 104 = 10296
Step 100: 10296 + 104 = 10400
Step 101: 10400 + 104 = 10504
Step 102: 10504 + 104 = 10608
Step 103: 10608 + 104 = 10712
Step 104: 10712 + 104 = 10816
Step 105: 10816 + 104 = 10920
Step 106: 10920 + 104 = 11024
Step 107: 11024 + 104 = 11128
Step 108: 11128 + 104 = 11232
Step 109: 11232 + 104 = 11336
Step 110: 11336 + 104 = 11440
Step 111: 11440 + 104 = 11544
Step 112: 11544 + 104 = 11648
Step 113: 11648 + 104 = 11752
Step 114: 11752 + 104 = 11856
Step 115: 11856 + 104 = 11960
Step 116: 11960 + 104 = 12064
Step 117: 12064 + 104 = 12168
Step 118: 12168 + 104 = 12272
Step 119: 12272 + 104 = 12376
Step 120: 12376 + 104 = 12480
Step 121: 12480 + 104 = 12584
Step 122: 12584 + 104 = 12688
Step 123: 12688 + 104 = 12792
Step 124: 12792 + 104 = 12896
Step 125: 12896 + 104 = 13000
Step 126: 13000 + 104 = 13104
Step 127: 13104 + 104 = 13208
Step 128: 13208 + 104 = 13312
Step 129: 13312 + 104 = 13416
Step 130: 13416 + 104 = 13520
Step 131: 13520 + 104 = 13624
Step 132: 13624 + 104 = 13728
Step 133: 13728 + 104 = 13832
Step 134: 13832 + 104 = 13936
Step 135: 13936 + 104 = 14040
Step 136: 14040 + 104 = 14144
Step 137: 14144 + 104 = 14248
Step 138: 14248 + 104 = 14352
Step 139: 14352 + 104 = 14456
Step 140: 14456 + 104 = 14560
Step 141: 14560 + 104 = 14664
Step 142: 14664 + 104 = 14768
Step 143: 14768 + 104 = 14872
Step 144: 14872 + 104 = 14976
Step 145: 14976 + 104 = 15080
Step 146: 15080 + 104 = 15184
Step 147: 15184 + 104 = 15288
Step 148: 15288 + 104 = 15392
Step 149: 15392 + 104 = 15496
Step 150: 15496 + 104 = 15600
Step 151: 15600 + 104 = 15704
Step 152: 15704 + 104 = 15808
Step 153: 15808 + 104 = 15912
Step 154: 15912 + 104 = 16016
Step 155: 16016 + 104 = 16120
Step 156: 16120 + 104 = 16224
Step 157: 16224 + 104 = 16328
Step 158: 16328 + 104 = 16432
Step 159: 16432 + 104 = 16536
Step 160: 16536 + 104 = 16640
Step 161: 16640 + 104 = 16744
Step 162: 16744 + 104 = 16848
Step 163: 16848 + 104 = 16952
Step 164: 16952 + 104 = 17056
Step 165: 17056 + 104 = 17160
Step 166: 17160 + 104 = 17264
Step 167: 17264 + 104 = 17368
Step 168: 17368 + 104 = 17472
Step 169: 17472 + 104 = 17576
Step 170: 17576 + 104 = 17680
Step 171: 17680 + 104 = 17784
Step 172: 17784 + 104 = 17888
Step 173: 17888 + 104 = 17992
Step 174: 17992 + 104 = 18096
Step 175: 18096 + 104 = 18200
Step 176: 18200 + 104 = 18304
Step 177: 18304 + 104 = 18408
Step 178: 18408 + 104 = 18512
Step 179: 18512 + 104 = 18616
Step 180: 18616 + 104 = 18720
Step 181: 18720 + 104 = 18824
Step 182: 18824 + 104 = 18928
Step 183: 18928 + 104 = 19032
Step 184: 19032 + 104 = 19136
Step 185: 19136 + 104 = 19240
Step 186: 19240 + 104 = 19344
Step 187: 19344 + 104 = 19448
Step 188: 19448 + 104 = 19552
Step 189: 19552 + 104 = 19656
Step 190: 19656 + 104 = 19760
Step 191: 19760 + 104 = 19864
Step 192: 19864 + 104 = 19968
Step 193: 19968 + 104 = 20072
Step 194: 20072 + 104 = 20176
Step 195: 20176 + 104 = 20280
Step 196: 20280 + 104 = 20384
Step 197: 20384 + 104 = 20488
Step 198: 20488 + 104 = 20592
Step 199: 20592 + 104 = 20696
Step 200: 20696 + 104 = 20800
Step 201: 20800 + 104 = 20904
Step 202: 20904 + 104 = 21008
Step 203: 21008 + 104 = 21112
Step 204: 21112 + 104 = 21216
Step 205: 21216 + 104 = 21320
Step 206: 21320 + 104 = 21424
Step 207: 21424 + 104 = 21528
Step 208: 21528 + 104 = 21632
Step 209: 21632 + 104 = 21736
Step 210: 21736 + 104 = 21840
Step 211: 21840 + 104 = 21944
Step 212: 21944 + 104 = 22048
Step 213: 22048 + 104 = 22152
Step 214: 22152 + 104 = 22256
Step 215: 22256 + 104 = 22360
Step 216: 22360 + 104 = 22464
Step 217: 22464 + 104 = 22568
Step 218: 22568 + 104 = 22672
Step 219: 22672 + 104 = 22776
Step 220: 22776 + 104 = 22880
Step 221: 22880 + 104 = 22984
Step 222: 22984 + 104 = 23088
Step 223: 23088 + 104 = 23192
Step 224: 23192 + 104 = 23296
Step 225: 23296 + 104 = 23400
Step 226: 23400 + 104 = 23504
Step 227: 23504 + 104 = 23608
Step 228: 23608 + 104 = 23712
Step 229: 23712 + 104 = 23816
Step 230: 23816 + 104 = 23920
Step 231: 23920 + 104 = 24024
Step 232: 24024 + 104 = 24128
Step 233: 24128 + 104 = 24232
Step 234: 24232 + 104 = 24336
Step 235: 24336 + 104 = 24440
Step 236: 24440 + 104 = 24544
Step 237: 24544 + 104 = 24648
Step 238: 24648 + 104 = 24752
Step 239: 24752 + 104 = 24856
Step 240: 24856 + 104 = 24960
Step 241: 24960 + 104 = 25064
Step 242: 25064 + 104 = 25168
Step 243: 25168 + 104 = 25272
Step 244: 25272 + 104 = 25376
Step 245: 25376 + 104 = 25480
Step 246: 25480 + 104 = 25584
Step 247: 25584 + 104 = 25688
Step 248: 25688 + 104 = 25792
Step 249: 25792 + 104 = 25896
Step 250: 25896 + 104 = 26000
Step 251: 26000 + 104 = 26104
Step 252: 26104 + 104 = 26208
Step 253: 26208 + 104 = 26312
Step 254: 26312 + 104 = 26416
Step 255: 26416 + 104 = 26520
Step 256: 26520 + 104 = 26624
Step 257: 26624 + 104 = 26728
Step 258: 26728 + 104 = 26832
Step 259: 26832 + 104 = 26936
Step 260: 26936 + 104 = 27040
Step 261: 27040 + 104 = 27144
Step 262: 27144 + 104 = 27248
Step 263: 27248 + 104 = 27352
Step 264: 27352 + 104 = 27456
Step 265: 27456 + 104 = 27560
Step 266: 27560 + 104 = 27664
Step 267: 27664 + 104 = 27768
Step 268: 27768 + 104 = 27872
Step 269: 27872 + 104 = 27976
Step 270: 27976 + 104 = 28080
Step 271: 28080 + 104 = 28184
Step 272: 28184 + 104 = 28288
Step 273: 28288 + 104 = 28392
Step 274: 28392 + 104 = 28496
Step 275: 28496 + 104 = 28600
Step 276: 28600 + 104 = 28704
Step 277: 28704 + 104 = 28808
Step 278: 28808 + 104 = 28912
Step 279: 28912 + 104 = 29016
Step 280: 29016 + 104 = 29120
Step 281: 29120 + 104 = 29224
Step 282: 29224 + 104 = 29328
Step 283: 29328 + 104 = 29432
Step 284: 29432 + 104 = 29536
Step 285: 29536 + 104 = 29640
Step 286: 29640 + 104 = 29744
Step 287: 29744 + 104 = 29848
Step 288: 29848 + 104 = 29952
Step 289: 29952 + 104 = 30056
Step 290: 30056 + 104 = 30160
Step 291: 30160 + 104 = 30264
Step 292: 30264 + 104 = 30368
Step 293: 30368 + 104 = 30472
Step 294: 30472 + 104 = 30576
Step 295: 30576 + 104 = 30680
Step 296: 30680 + 104 = 30784
Step 297: 30784 + 104 = 30888
Step 298: 30888 + 104 = 30992
Step 299: 30992 + 104 = 31096
Step 300: 31096 + 104 = 31200
Step 301: 31200 + 104 = 31304
Step 302: 31304 + 104 = 31408
Step 303: 31408 + 104 = 31512
Step 304: 31512 + 104 = 31616
Step 305: 31616 + 104 = 31720
Step 306: 31720 + 104 = 31824
Step 307: 31824 + 104 = 31928
Step 308: 31928 + 104 = 32032
Step 309: 32032 + 104 = 32136
Step 310: 32136 + 104 = 32240
Step 311: 32240 + 104 = 32344
Step 312: 32344 + 104 = 32448
Step 313: 32448 + 104 = 32552
Step 314: 32552 + 104 = 32656
Step 315: 32656 + 104 = 32760
Step 316: 32760 + 104 = 32864
Step 317: 32864 + 104 = 32968
Step 318: 32968 + 104 = 33072
Step 319: 33072 + 104 = 33176
Step 320: 33176 + 104 = 33280
Step 321: 33280 + 104 = 33384
Step 322: 33384 + 104 = 33488
Step 323: 33488 + 104 = 33592
Step 324: 33592 + 104 = 33696
Step 325: 33696 + 104 = 33800
Step 326: 33800 + 104 = 33904
Step 327: 33904 + 104 = 34008
Step 328: 34008 + 104 = 34112
Step 329: 34112 + 104 = 34216
Step 330: 34216 + 104 = 34320
Step 331: 34320 + 104 = 34424
Step 332: 34424 + 104 = 34528
Step 333: 34528 + 104 = 34632
Step 334: 34632 + 104 = 34736
Step 335: 34736 + 104 = 34840
Step 336: 34840 + 104 = 34944
Step 337: 34944 + 104 = 35048
Step 338: 35048 + 104 = 35152
Step 339: 35152 + 104 = 35256
Step 340: 35256 + 104 = 35360
Step 341: 35360 + 104 = 35464
Step 342: 35464 + 104 = 35568
Step 343: 35568 + 104 = 35672
Step 344: 35672 + 104 = 35776
Step 345: 35776 + 104 = 35880
Step 346: 35880 + 104 = 35984
Step 347: 35984 + 104 = 36088
Step 348: 36088 + 104 = 36192
Step 349: 36192 + 104 = 36296
Step 350: 36296 + 104 = 36400
Step 351: 36400 + 104 = 36504
Step 352: 36504 + 104 = 36608
Step 353: 36608 + 104 = 36712
Step 354: 36712 + 104 = 36816
Step 355: 36816 + 104 = 36920
Step 356: 36920 + 104 = 37024
Step 357: 37024 + 104 = 37128
Step 358: 37128 + 104 = 37232
Step 359: 37232 + 104 = 37336
Step 360: 37336 + 104 = 37440
Step 361: 37440 + 104 = 37544
Step 362: 37544 + 104 = 37648
Step 363: 37648 + 104 = 37752
Step 364: 37752 + 104 = 37856
Step 365: 37856 + 104 = 37960
Step 366: 37960 + 104 = 38064
Step 367: 38064 + 104 = 38168
Step 368: 38168 + 104 = 38272
Step 369: 38272 + 104 = 38376
Step 370: 38376 + 104 = 38480
Step 371: 38480 + 104 = 38584
Step 372: 38584 + 104 = 38688
Step 373: 38688 + 104 = 38792
Step 374: 38792 + 104 = 38896
Step 375: 38896 + 104 = 39000
Step 376: 39000 + 104 = 39104
Step 377: 39104 + 104 = 39208
Step 378: 39208 + 104 = 39312
Step 379: 39312 + 104 = 39416
Step 380: 39416 + 104 = 39520
Step 381: 39520 + 104 = 39624
Step 382: 39624 + 104 = 39728
Step 383: 39728 + 104 = 39832
Step 384: 39832 + 104 = 39936
Step 385: 39936 + 104 = 40040
Step 386: 40040 + 104 = 40144
Step 387: 40144 + 104 = 40248
Step 388: 40248 + 104 = 40352
Step 389: 40352 + 104 = 40456
Step 390: 40456 + 104 = 40560
Step 391: 40560 + 104 = 40664
Step 392: 40664 + 104 = 40768
Step 393: 40768 + 104 = 40872
Step 394: 40872 + 104 = 40976
Step 395: 40976 + 104 = 41080
Step 396: 41080 + 104 = 41184
Step 397: 41184 + 104 = 41288
Step 398: 41288 + 104 = 41392
Step 399: 41392 + 104 = 41496
Step 400: 41496 + 104 = 41600
Step 401: 41600 + 104 = 41704
Step 402: 41704 + 104 = 41808
Step 403: 41808 + 104 = 41912
Step 404: 41912 + 104 = 42016
Step 405: 42016 + 104 = 42120
Step 406: 42120 + 104 = 42224
Step 407: 42224 + 104 = 42328
Step 408: 42328 + 104 = 42432
Step 409: 42432 + 104 = 42536
Step 410: 42536 + 104 = 42640

So, 104*410 = 42640