Without delay, let's solve this. We've got 315 and we will be multiplying it by 405, that is, adding 315 to itself 405 times.
Step 1: 0 + 315 = 315
Step 2: 315 + 315 = 630
Step 3: 630 + 315 = 945
Step 4: 945 + 315 = 1260
Step 5: 1260 + 315 = 1575
Step 6: 1575 + 315 = 1890
Step 7: 1890 + 315 = 2205
Step 8: 2205 + 315 = 2520
Step 9: 2520 + 315 = 2835
Step 10: 2835 + 315 = 3150
Step 11: 3150 + 315 = 3465
Step 12: 3465 + 315 = 3780
Step 13: 3780 + 315 = 4095
Step 14: 4095 + 315 = 4410
Step 15: 4410 + 315 = 4725
Step 16: 4725 + 315 = 5040
Step 17: 5040 + 315 = 5355
Step 18: 5355 + 315 = 5670
Step 19: 5670 + 315 = 5985
Step 20: 5985 + 315 = 6300
Step 21: 6300 + 315 = 6615
Step 22: 6615 + 315 = 6930
Step 23: 6930 + 315 = 7245
Step 24: 7245 + 315 = 7560
Step 25: 7560 + 315 = 7875
Step 26: 7875 + 315 = 8190
Step 27: 8190 + 315 = 8505
Step 28: 8505 + 315 = 8820
Step 29: 8820 + 315 = 9135
Step 30: 9135 + 315 = 9450
Step 31: 9450 + 315 = 9765
Step 32: 9765 + 315 = 10080
Step 33: 10080 + 315 = 10395
Step 34: 10395 + 315 = 10710
Step 35: 10710 + 315 = 11025
Step 36: 11025 + 315 = 11340
Step 37: 11340 + 315 = 11655
Step 38: 11655 + 315 = 11970
Step 39: 11970 + 315 = 12285
Step 40: 12285 + 315 = 12600
Step 41: 12600 + 315 = 12915
Step 42: 12915 + 315 = 13230
Step 43: 13230 + 315 = 13545
Step 44: 13545 + 315 = 13860
Step 45: 13860 + 315 = 14175
Step 46: 14175 + 315 = 14490
Step 47: 14490 + 315 = 14805
Step 48: 14805 + 315 = 15120
Step 49: 15120 + 315 = 15435
Step 50: 15435 + 315 = 15750
Step 51: 15750 + 315 = 16065
Step 52: 16065 + 315 = 16380
Step 53: 16380 + 315 = 16695
Step 54: 16695 + 315 = 17010
Step 55: 17010 + 315 = 17325
Step 56: 17325 + 315 = 17640
Step 57: 17640 + 315 = 17955
Step 58: 17955 + 315 = 18270
Step 59: 18270 + 315 = 18585
Step 60: 18585 + 315 = 18900
Step 61: 18900 + 315 = 19215
Step 62: 19215 + 315 = 19530
Step 63: 19530 + 315 = 19845
Step 64: 19845 + 315 = 20160
Step 65: 20160 + 315 = 20475
Step 66: 20475 + 315 = 20790
Step 67: 20790 + 315 = 21105
Step 68: 21105 + 315 = 21420
Step 69: 21420 + 315 = 21735
Step 70: 21735 + 315 = 22050
Step 71: 22050 + 315 = 22365
Step 72: 22365 + 315 = 22680
Step 73: 22680 + 315 = 22995
Step 74: 22995 + 315 = 23310
Step 75: 23310 + 315 = 23625
Step 76: 23625 + 315 = 23940
Step 77: 23940 + 315 = 24255
Step 78: 24255 + 315 = 24570
Step 79: 24570 + 315 = 24885
Step 80: 24885 + 315 = 25200
Step 81: 25200 + 315 = 25515
Step 82: 25515 + 315 = 25830
Step 83: 25830 + 315 = 26145
Step 84: 26145 + 315 = 26460
Step 85: 26460 + 315 = 26775
Step 86: 26775 + 315 = 27090
Step 87: 27090 + 315 = 27405
Step 88: 27405 + 315 = 27720
Step 89: 27720 + 315 = 28035
Step 90: 28035 + 315 = 28350
Step 91: 28350 + 315 = 28665
Step 92: 28665 + 315 = 28980
Step 93: 28980 + 315 = 29295
Step 94: 29295 + 315 = 29610
Step 95: 29610 + 315 = 29925
Step 96: 29925 + 315 = 30240
Step 97: 30240 + 315 = 30555
Step 98: 30555 + 315 = 30870
Step 99: 30870 + 315 = 31185
Step 100: 31185 + 315 = 31500
Step 101: 31500 + 315 = 31815
Step 102: 31815 + 315 = 32130
Step 103: 32130 + 315 = 32445
Step 104: 32445 + 315 = 32760
Step 105: 32760 + 315 = 33075
Step 106: 33075 + 315 = 33390
Step 107: 33390 + 315 = 33705
Step 108: 33705 + 315 = 34020
Step 109: 34020 + 315 = 34335
Step 110: 34335 + 315 = 34650
Step 111: 34650 + 315 = 34965
Step 112: 34965 + 315 = 35280
Step 113: 35280 + 315 = 35595
Step 114: 35595 + 315 = 35910
Step 115: 35910 + 315 = 36225
Step 116: 36225 + 315 = 36540
Step 117: 36540 + 315 = 36855
Step 118: 36855 + 315 = 37170
Step 119: 37170 + 315 = 37485
Step 120: 37485 + 315 = 37800
Step 121: 37800 + 315 = 38115
Step 122: 38115 + 315 = 38430
Step 123: 38430 + 315 = 38745
Step 124: 38745 + 315 = 39060
Step 125: 39060 + 315 = 39375
Step 126: 39375 + 315 = 39690
Step 127: 39690 + 315 = 40005
Step 128: 40005 + 315 = 40320
Step 129: 40320 + 315 = 40635
Step 130: 40635 + 315 = 40950
Step 131: 40950 + 315 = 41265
Step 132: 41265 + 315 = 41580
Step 133: 41580 + 315 = 41895
Step 134: 41895 + 315 = 42210
Step 135: 42210 + 315 = 42525
Step 136: 42525 + 315 = 42840
Step 137: 42840 + 315 = 43155
Step 138: 43155 + 315 = 43470
Step 139: 43470 + 315 = 43785
Step 140: 43785 + 315 = 44100
Step 141: 44100 + 315 = 44415
Step 142: 44415 + 315 = 44730
Step 143: 44730 + 315 = 45045
Step 144: 45045 + 315 = 45360
Step 145: 45360 + 315 = 45675
Step 146: 45675 + 315 = 45990
Step 147: 45990 + 315 = 46305
Step 148: 46305 + 315 = 46620
Step 149: 46620 + 315 = 46935
Step 150: 46935 + 315 = 47250
Step 151: 47250 + 315 = 47565
Step 152: 47565 + 315 = 47880
Step 153: 47880 + 315 = 48195
Step 154: 48195 + 315 = 48510
Step 155: 48510 + 315 = 48825
Step 156: 48825 + 315 = 49140
Step 157: 49140 + 315 = 49455
Step 158: 49455 + 315 = 49770
Step 159: 49770 + 315 = 50085
Step 160: 50085 + 315 = 50400
Step 161: 50400 + 315 = 50715
Step 162: 50715 + 315 = 51030
Step 163: 51030 + 315 = 51345
Step 164: 51345 + 315 = 51660
Step 165: 51660 + 315 = 51975
Step 166: 51975 + 315 = 52290
Step 167: 52290 + 315 = 52605
Step 168: 52605 + 315 = 52920
Step 169: 52920 + 315 = 53235
Step 170: 53235 + 315 = 53550
Step 171: 53550 + 315 = 53865
Step 172: 53865 + 315 = 54180
Step 173: 54180 + 315 = 54495
Step 174: 54495 + 315 = 54810
Step 175: 54810 + 315 = 55125
Step 176: 55125 + 315 = 55440
Step 177: 55440 + 315 = 55755
Step 178: 55755 + 315 = 56070
Step 179: 56070 + 315 = 56385
Step 180: 56385 + 315 = 56700
Step 181: 56700 + 315 = 57015
Step 182: 57015 + 315 = 57330
Step 183: 57330 + 315 = 57645
Step 184: 57645 + 315 = 57960
Step 185: 57960 + 315 = 58275
Step 186: 58275 + 315 = 58590
Step 187: 58590 + 315 = 58905
Step 188: 58905 + 315 = 59220
Step 189: 59220 + 315 = 59535
Step 190: 59535 + 315 = 59850
Step 191: 59850 + 315 = 60165
Step 192: 60165 + 315 = 60480
Step 193: 60480 + 315 = 60795
Step 194: 60795 + 315 = 61110
Step 195: 61110 + 315 = 61425
Step 196: 61425 + 315 = 61740
Step 197: 61740 + 315 = 62055
Step 198: 62055 + 315 = 62370
Step 199: 62370 + 315 = 62685
Step 200: 62685 + 315 = 63000
Step 201: 63000 + 315 = 63315
Step 202: 63315 + 315 = 63630
Step 203: 63630 + 315 = 63945
Step 204: 63945 + 315 = 64260
Step 205: 64260 + 315 = 64575
Step 206: 64575 + 315 = 64890
Step 207: 64890 + 315 = 65205
Step 208: 65205 + 315 = 65520
Step 209: 65520 + 315 = 65835
Step 210: 65835 + 315 = 66150
Step 211: 66150 + 315 = 66465
Step 212: 66465 + 315 = 66780
Step 213: 66780 + 315 = 67095
Step 214: 67095 + 315 = 67410
Step 215: 67410 + 315 = 67725
Step 216: 67725 + 315 = 68040
Step 217: 68040 + 315 = 68355
Step 218: 68355 + 315 = 68670
Step 219: 68670 + 315 = 68985
Step 220: 68985 + 315 = 69300
Step 221: 69300 + 315 = 69615
Step 222: 69615 + 315 = 69930
Step 223: 69930 + 315 = 70245
Step 224: 70245 + 315 = 70560
Step 225: 70560 + 315 = 70875
Step 226: 70875 + 315 = 71190
Step 227: 71190 + 315 = 71505
Step 228: 71505 + 315 = 71820
Step 229: 71820 + 315 = 72135
Step 230: 72135 + 315 = 72450
Step 231: 72450 + 315 = 72765
Step 232: 72765 + 315 = 73080
Step 233: 73080 + 315 = 73395
Step 234: 73395 + 315 = 73710
Step 235: 73710 + 315 = 74025
Step 236: 74025 + 315 = 74340
Step 237: 74340 + 315 = 74655
Step 238: 74655 + 315 = 74970
Step 239: 74970 + 315 = 75285
Step 240: 75285 + 315 = 75600
Step 241: 75600 + 315 = 75915
Step 242: 75915 + 315 = 76230
Step 243: 76230 + 315 = 76545
Step 244: 76545 + 315 = 76860
Step 245: 76860 + 315 = 77175
Step 246: 77175 + 315 = 77490
Step 247: 77490 + 315 = 77805
Step 248: 77805 + 315 = 78120
Step 249: 78120 + 315 = 78435
Step 250: 78435 + 315 = 78750
Step 251: 78750 + 315 = 79065
Step 252: 79065 + 315 = 79380
Step 253: 79380 + 315 = 79695
Step 254: 79695 + 315 = 80010
Step 255: 80010 + 315 = 80325
Step 256: 80325 + 315 = 80640
Step 257: 80640 + 315 = 80955
Step 258: 80955 + 315 = 81270
Step 259: 81270 + 315 = 81585
Step 260: 81585 + 315 = 81900
Step 261: 81900 + 315 = 82215
Step 262: 82215 + 315 = 82530
Step 263: 82530 + 315 = 82845
Step 264: 82845 + 315 = 83160
Step 265: 83160 + 315 = 83475
Step 266: 83475 + 315 = 83790
Step 267: 83790 + 315 = 84105
Step 268: 84105 + 315 = 84420
Step 269: 84420 + 315 = 84735
Step 270: 84735 + 315 = 85050
Step 271: 85050 + 315 = 85365
Step 272: 85365 + 315 = 85680
Step 273: 85680 + 315 = 85995
Step 274: 85995 + 315 = 86310
Step 275: 86310 + 315 = 86625
Step 276: 86625 + 315 = 86940
Step 277: 86940 + 315 = 87255
Step 278: 87255 + 315 = 87570
Step 279: 87570 + 315 = 87885
Step 280: 87885 + 315 = 88200
Step 281: 88200 + 315 = 88515
Step 282: 88515 + 315 = 88830
Step 283: 88830 + 315 = 89145
Step 284: 89145 + 315 = 89460
Step 285: 89460 + 315 = 89775
Step 286: 89775 + 315 = 90090
Step 287: 90090 + 315 = 90405
Step 288: 90405 + 315 = 90720
Step 289: 90720 + 315 = 91035
Step 290: 91035 + 315 = 91350
Step 291: 91350 + 315 = 91665
Step 292: 91665 + 315 = 91980
Step 293: 91980 + 315 = 92295
Step 294: 92295 + 315 = 92610
Step 295: 92610 + 315 = 92925
Step 296: 92925 + 315 = 93240
Step 297: 93240 + 315 = 93555
Step 298: 93555 + 315 = 93870
Step 299: 93870 + 315 = 94185
Step 300: 94185 + 315 = 94500
Step 301: 94500 + 315 = 94815
Step 302: 94815 + 315 = 95130
Step 303: 95130 + 315 = 95445
Step 304: 95445 + 315 = 95760
Step 305: 95760 + 315 = 96075
Step 306: 96075 + 315 = 96390
Step 307: 96390 + 315 = 96705
Step 308: 96705 + 315 = 97020
Step 309: 97020 + 315 = 97335
Step 310: 97335 + 315 = 97650
Step 311: 97650 + 315 = 97965
Step 312: 97965 + 315 = 98280
Step 313: 98280 + 315 = 98595
Step 314: 98595 + 315 = 98910
Step 315: 98910 + 315 = 99225
Step 316: 99225 + 315 = 99540
Step 317: 99540 + 315 = 99855
Step 318: 99855 + 315 = 100170
Step 319: 100170 + 315 = 100485
Step 320: 100485 + 315 = 100800
Step 321: 100800 + 315 = 101115
Step 322: 101115 + 315 = 101430
Step 323: 101430 + 315 = 101745
Step 324: 101745 + 315 = 102060
Step 325: 102060 + 315 = 102375
Step 326: 102375 + 315 = 102690
Step 327: 102690 + 315 = 103005
Step 328: 103005 + 315 = 103320
Step 329: 103320 + 315 = 103635
Step 330: 103635 + 315 = 103950
Step 331: 103950 + 315 = 104265
Step 332: 104265 + 315 = 104580
Step 333: 104580 + 315 = 104895
Step 334: 104895 + 315 = 105210
Step 335: 105210 + 315 = 105525
Step 336: 105525 + 315 = 105840
Step 337: 105840 + 315 = 106155
Step 338: 106155 + 315 = 106470
Step 339: 106470 + 315 = 106785
Step 340: 106785 + 315 = 107100
Step 341: 107100 + 315 = 107415
Step 342: 107415 + 315 = 107730
Step 343: 107730 + 315 = 108045
Step 344: 108045 + 315 = 108360
Step 345: 108360 + 315 = 108675
Step 346: 108675 + 315 = 108990
Step 347: 108990 + 315 = 109305
Step 348: 109305 + 315 = 109620
Step 349: 109620 + 315 = 109935
Step 350: 109935 + 315 = 110250
Step 351: 110250 + 315 = 110565
Step 352: 110565 + 315 = 110880
Step 353: 110880 + 315 = 111195
Step 354: 111195 + 315 = 111510
Step 355: 111510 + 315 = 111825
Step 356: 111825 + 315 = 112140
Step 357: 112140 + 315 = 112455
Step 358: 112455 + 315 = 112770
Step 359: 112770 + 315 = 113085
Step 360: 113085 + 315 = 113400
Step 361: 113400 + 315 = 113715
Step 362: 113715 + 315 = 114030
Step 363: 114030 + 315 = 114345
Step 364: 114345 + 315 = 114660
Step 365: 114660 + 315 = 114975
Step 366: 114975 + 315 = 115290
Step 367: 115290 + 315 = 115605
Step 368: 115605 + 315 = 115920
Step 369: 115920 + 315 = 116235
Step 370: 116235 + 315 = 116550
Step 371: 116550 + 315 = 116865
Step 372: 116865 + 315 = 117180
Step 373: 117180 + 315 = 117495
Step 374: 117495 + 315 = 117810
Step 375: 117810 + 315 = 118125
Step 376: 118125 + 315 = 118440
Step 377: 118440 + 315 = 118755
Step 378: 118755 + 315 = 119070
Step 379: 119070 + 315 = 119385
Step 380: 119385 + 315 = 119700
Step 381: 119700 + 315 = 120015
Step 382: 120015 + 315 = 120330
Step 383: 120330 + 315 = 120645
Step 384: 120645 + 315 = 120960
Step 385: 120960 + 315 = 121275
Step 386: 121275 + 315 = 121590
Step 387: 121590 + 315 = 121905
Step 388: 121905 + 315 = 122220
Step 389: 122220 + 315 = 122535
Step 390: 122535 + 315 = 122850
Step 391: 122850 + 315 = 123165
Step 392: 123165 + 315 = 123480
Step 393: 123480 + 315 = 123795
Step 394: 123795 + 315 = 124110
Step 395: 124110 + 315 = 124425
Step 396: 124425 + 315 = 124740
Step 397: 124740 + 315 = 125055
Step 398: 125055 + 315 = 125370
Step 399: 125370 + 315 = 125685
Step 400: 125685 + 315 = 126000
Step 401: 126000 + 315 = 126315
Step 402: 126315 + 315 = 126630
Step 403: 126630 + 315 = 126945
Step 404: 126945 + 315 = 127260
Step 405: 127260 + 315 = 127575

So, 315*405 = 127575