Without delay, let's solve this. We've got 405 and we will be multiplying it by 422, that is, adding 405 to itself 422 times.
Step 1: 0 + 405 = 405
Step 2: 405 + 405 = 810
Step 3: 810 + 405 = 1215
Step 4: 1215 + 405 = 1620
Step 5: 1620 + 405 = 2025
Step 6: 2025 + 405 = 2430
Step 7: 2430 + 405 = 2835
Step 8: 2835 + 405 = 3240
Step 9: 3240 + 405 = 3645
Step 10: 3645 + 405 = 4050
Step 11: 4050 + 405 = 4455
Step 12: 4455 + 405 = 4860
Step 13: 4860 + 405 = 5265
Step 14: 5265 + 405 = 5670
Step 15: 5670 + 405 = 6075
Step 16: 6075 + 405 = 6480
Step 17: 6480 + 405 = 6885
Step 18: 6885 + 405 = 7290
Step 19: 7290 + 405 = 7695
Step 20: 7695 + 405 = 8100
Step 21: 8100 + 405 = 8505
Step 22: 8505 + 405 = 8910
Step 23: 8910 + 405 = 9315
Step 24: 9315 + 405 = 9720
Step 25: 9720 + 405 = 10125
Step 26: 10125 + 405 = 10530
Step 27: 10530 + 405 = 10935
Step 28: 10935 + 405 = 11340
Step 29: 11340 + 405 = 11745
Step 30: 11745 + 405 = 12150
Step 31: 12150 + 405 = 12555
Step 32: 12555 + 405 = 12960
Step 33: 12960 + 405 = 13365
Step 34: 13365 + 405 = 13770
Step 35: 13770 + 405 = 14175
Step 36: 14175 + 405 = 14580
Step 37: 14580 + 405 = 14985
Step 38: 14985 + 405 = 15390
Step 39: 15390 + 405 = 15795
Step 40: 15795 + 405 = 16200
Step 41: 16200 + 405 = 16605
Step 42: 16605 + 405 = 17010
Step 43: 17010 + 405 = 17415
Step 44: 17415 + 405 = 17820
Step 45: 17820 + 405 = 18225
Step 46: 18225 + 405 = 18630
Step 47: 18630 + 405 = 19035
Step 48: 19035 + 405 = 19440
Step 49: 19440 + 405 = 19845
Step 50: 19845 + 405 = 20250
Step 51: 20250 + 405 = 20655
Step 52: 20655 + 405 = 21060
Step 53: 21060 + 405 = 21465
Step 54: 21465 + 405 = 21870
Step 55: 21870 + 405 = 22275
Step 56: 22275 + 405 = 22680
Step 57: 22680 + 405 = 23085
Step 58: 23085 + 405 = 23490
Step 59: 23490 + 405 = 23895
Step 60: 23895 + 405 = 24300
Step 61: 24300 + 405 = 24705
Step 62: 24705 + 405 = 25110
Step 63: 25110 + 405 = 25515
Step 64: 25515 + 405 = 25920
Step 65: 25920 + 405 = 26325
Step 66: 26325 + 405 = 26730
Step 67: 26730 + 405 = 27135
Step 68: 27135 + 405 = 27540
Step 69: 27540 + 405 = 27945
Step 70: 27945 + 405 = 28350
Step 71: 28350 + 405 = 28755
Step 72: 28755 + 405 = 29160
Step 73: 29160 + 405 = 29565
Step 74: 29565 + 405 = 29970
Step 75: 29970 + 405 = 30375
Step 76: 30375 + 405 = 30780
Step 77: 30780 + 405 = 31185
Step 78: 31185 + 405 = 31590
Step 79: 31590 + 405 = 31995
Step 80: 31995 + 405 = 32400
Step 81: 32400 + 405 = 32805
Step 82: 32805 + 405 = 33210
Step 83: 33210 + 405 = 33615
Step 84: 33615 + 405 = 34020
Step 85: 34020 + 405 = 34425
Step 86: 34425 + 405 = 34830
Step 87: 34830 + 405 = 35235
Step 88: 35235 + 405 = 35640
Step 89: 35640 + 405 = 36045
Step 90: 36045 + 405 = 36450
Step 91: 36450 + 405 = 36855
Step 92: 36855 + 405 = 37260
Step 93: 37260 + 405 = 37665
Step 94: 37665 + 405 = 38070
Step 95: 38070 + 405 = 38475
Step 96: 38475 + 405 = 38880
Step 97: 38880 + 405 = 39285
Step 98: 39285 + 405 = 39690
Step 99: 39690 + 405 = 40095
Step 100: 40095 + 405 = 40500
Step 101: 40500 + 405 = 40905
Step 102: 40905 + 405 = 41310
Step 103: 41310 + 405 = 41715
Step 104: 41715 + 405 = 42120
Step 105: 42120 + 405 = 42525
Step 106: 42525 + 405 = 42930
Step 107: 42930 + 405 = 43335
Step 108: 43335 + 405 = 43740
Step 109: 43740 + 405 = 44145
Step 110: 44145 + 405 = 44550
Step 111: 44550 + 405 = 44955
Step 112: 44955 + 405 = 45360
Step 113: 45360 + 405 = 45765
Step 114: 45765 + 405 = 46170
Step 115: 46170 + 405 = 46575
Step 116: 46575 + 405 = 46980
Step 117: 46980 + 405 = 47385
Step 118: 47385 + 405 = 47790
Step 119: 47790 + 405 = 48195
Step 120: 48195 + 405 = 48600
Step 121: 48600 + 405 = 49005
Step 122: 49005 + 405 = 49410
Step 123: 49410 + 405 = 49815
Step 124: 49815 + 405 = 50220
Step 125: 50220 + 405 = 50625
Step 126: 50625 + 405 = 51030
Step 127: 51030 + 405 = 51435
Step 128: 51435 + 405 = 51840
Step 129: 51840 + 405 = 52245
Step 130: 52245 + 405 = 52650
Step 131: 52650 + 405 = 53055
Step 132: 53055 + 405 = 53460
Step 133: 53460 + 405 = 53865
Step 134: 53865 + 405 = 54270
Step 135: 54270 + 405 = 54675
Step 136: 54675 + 405 = 55080
Step 137: 55080 + 405 = 55485
Step 138: 55485 + 405 = 55890
Step 139: 55890 + 405 = 56295
Step 140: 56295 + 405 = 56700
Step 141: 56700 + 405 = 57105
Step 142: 57105 + 405 = 57510
Step 143: 57510 + 405 = 57915
Step 144: 57915 + 405 = 58320
Step 145: 58320 + 405 = 58725
Step 146: 58725 + 405 = 59130
Step 147: 59130 + 405 = 59535
Step 148: 59535 + 405 = 59940
Step 149: 59940 + 405 = 60345
Step 150: 60345 + 405 = 60750
Step 151: 60750 + 405 = 61155
Step 152: 61155 + 405 = 61560
Step 153: 61560 + 405 = 61965
Step 154: 61965 + 405 = 62370
Step 155: 62370 + 405 = 62775
Step 156: 62775 + 405 = 63180
Step 157: 63180 + 405 = 63585
Step 158: 63585 + 405 = 63990
Step 159: 63990 + 405 = 64395
Step 160: 64395 + 405 = 64800
Step 161: 64800 + 405 = 65205
Step 162: 65205 + 405 = 65610
Step 163: 65610 + 405 = 66015
Step 164: 66015 + 405 = 66420
Step 165: 66420 + 405 = 66825
Step 166: 66825 + 405 = 67230
Step 167: 67230 + 405 = 67635
Step 168: 67635 + 405 = 68040
Step 169: 68040 + 405 = 68445
Step 170: 68445 + 405 = 68850
Step 171: 68850 + 405 = 69255
Step 172: 69255 + 405 = 69660
Step 173: 69660 + 405 = 70065
Step 174: 70065 + 405 = 70470
Step 175: 70470 + 405 = 70875
Step 176: 70875 + 405 = 71280
Step 177: 71280 + 405 = 71685
Step 178: 71685 + 405 = 72090
Step 179: 72090 + 405 = 72495
Step 180: 72495 + 405 = 72900
Step 181: 72900 + 405 = 73305
Step 182: 73305 + 405 = 73710
Step 183: 73710 + 405 = 74115
Step 184: 74115 + 405 = 74520
Step 185: 74520 + 405 = 74925
Step 186: 74925 + 405 = 75330
Step 187: 75330 + 405 = 75735
Step 188: 75735 + 405 = 76140
Step 189: 76140 + 405 = 76545
Step 190: 76545 + 405 = 76950
Step 191: 76950 + 405 = 77355
Step 192: 77355 + 405 = 77760
Step 193: 77760 + 405 = 78165
Step 194: 78165 + 405 = 78570
Step 195: 78570 + 405 = 78975
Step 196: 78975 + 405 = 79380
Step 197: 79380 + 405 = 79785
Step 198: 79785 + 405 = 80190
Step 199: 80190 + 405 = 80595
Step 200: 80595 + 405 = 81000
Step 201: 81000 + 405 = 81405
Step 202: 81405 + 405 = 81810
Step 203: 81810 + 405 = 82215
Step 204: 82215 + 405 = 82620
Step 205: 82620 + 405 = 83025
Step 206: 83025 + 405 = 83430
Step 207: 83430 + 405 = 83835
Step 208: 83835 + 405 = 84240
Step 209: 84240 + 405 = 84645
Step 210: 84645 + 405 = 85050
Step 211: 85050 + 405 = 85455
Step 212: 85455 + 405 = 85860
Step 213: 85860 + 405 = 86265
Step 214: 86265 + 405 = 86670
Step 215: 86670 + 405 = 87075
Step 216: 87075 + 405 = 87480
Step 217: 87480 + 405 = 87885
Step 218: 87885 + 405 = 88290
Step 219: 88290 + 405 = 88695
Step 220: 88695 + 405 = 89100
Step 221: 89100 + 405 = 89505
Step 222: 89505 + 405 = 89910
Step 223: 89910 + 405 = 90315
Step 224: 90315 + 405 = 90720
Step 225: 90720 + 405 = 91125
Step 226: 91125 + 405 = 91530
Step 227: 91530 + 405 = 91935
Step 228: 91935 + 405 = 92340
Step 229: 92340 + 405 = 92745
Step 230: 92745 + 405 = 93150
Step 231: 93150 + 405 = 93555
Step 232: 93555 + 405 = 93960
Step 233: 93960 + 405 = 94365
Step 234: 94365 + 405 = 94770
Step 235: 94770 + 405 = 95175
Step 236: 95175 + 405 = 95580
Step 237: 95580 + 405 = 95985
Step 238: 95985 + 405 = 96390
Step 239: 96390 + 405 = 96795
Step 240: 96795 + 405 = 97200
Step 241: 97200 + 405 = 97605
Step 242: 97605 + 405 = 98010
Step 243: 98010 + 405 = 98415
Step 244: 98415 + 405 = 98820
Step 245: 98820 + 405 = 99225
Step 246: 99225 + 405 = 99630
Step 247: 99630 + 405 = 100035
Step 248: 100035 + 405 = 100440
Step 249: 100440 + 405 = 100845
Step 250: 100845 + 405 = 101250
Step 251: 101250 + 405 = 101655
Step 252: 101655 + 405 = 102060
Step 253: 102060 + 405 = 102465
Step 254: 102465 + 405 = 102870
Step 255: 102870 + 405 = 103275
Step 256: 103275 + 405 = 103680
Step 257: 103680 + 405 = 104085
Step 258: 104085 + 405 = 104490
Step 259: 104490 + 405 = 104895
Step 260: 104895 + 405 = 105300
Step 261: 105300 + 405 = 105705
Step 262: 105705 + 405 = 106110
Step 263: 106110 + 405 = 106515
Step 264: 106515 + 405 = 106920
Step 265: 106920 + 405 = 107325
Step 266: 107325 + 405 = 107730
Step 267: 107730 + 405 = 108135
Step 268: 108135 + 405 = 108540
Step 269: 108540 + 405 = 108945
Step 270: 108945 + 405 = 109350
Step 271: 109350 + 405 = 109755
Step 272: 109755 + 405 = 110160
Step 273: 110160 + 405 = 110565
Step 274: 110565 + 405 = 110970
Step 275: 110970 + 405 = 111375
Step 276: 111375 + 405 = 111780
Step 277: 111780 + 405 = 112185
Step 278: 112185 + 405 = 112590
Step 279: 112590 + 405 = 112995
Step 280: 112995 + 405 = 113400
Step 281: 113400 + 405 = 113805
Step 282: 113805 + 405 = 114210
Step 283: 114210 + 405 = 114615
Step 284: 114615 + 405 = 115020
Step 285: 115020 + 405 = 115425
Step 286: 115425 + 405 = 115830
Step 287: 115830 + 405 = 116235
Step 288: 116235 + 405 = 116640
Step 289: 116640 + 405 = 117045
Step 290: 117045 + 405 = 117450
Step 291: 117450 + 405 = 117855
Step 292: 117855 + 405 = 118260
Step 293: 118260 + 405 = 118665
Step 294: 118665 + 405 = 119070
Step 295: 119070 + 405 = 119475
Step 296: 119475 + 405 = 119880
Step 297: 119880 + 405 = 120285
Step 298: 120285 + 405 = 120690
Step 299: 120690 + 405 = 121095
Step 300: 121095 + 405 = 121500
Step 301: 121500 + 405 = 121905
Step 302: 121905 + 405 = 122310
Step 303: 122310 + 405 = 122715
Step 304: 122715 + 405 = 123120
Step 305: 123120 + 405 = 123525
Step 306: 123525 + 405 = 123930
Step 307: 123930 + 405 = 124335
Step 308: 124335 + 405 = 124740
Step 309: 124740 + 405 = 125145
Step 310: 125145 + 405 = 125550
Step 311: 125550 + 405 = 125955
Step 312: 125955 + 405 = 126360
Step 313: 126360 + 405 = 126765
Step 314: 126765 + 405 = 127170
Step 315: 127170 + 405 = 127575
Step 316: 127575 + 405 = 127980
Step 317: 127980 + 405 = 128385
Step 318: 128385 + 405 = 128790
Step 319: 128790 + 405 = 129195
Step 320: 129195 + 405 = 129600
Step 321: 129600 + 405 = 130005
Step 322: 130005 + 405 = 130410
Step 323: 130410 + 405 = 130815
Step 324: 130815 + 405 = 131220
Step 325: 131220 + 405 = 131625
Step 326: 131625 + 405 = 132030
Step 327: 132030 + 405 = 132435
Step 328: 132435 + 405 = 132840
Step 329: 132840 + 405 = 133245
Step 330: 133245 + 405 = 133650
Step 331: 133650 + 405 = 134055
Step 332: 134055 + 405 = 134460
Step 333: 134460 + 405 = 134865
Step 334: 134865 + 405 = 135270
Step 335: 135270 + 405 = 135675
Step 336: 135675 + 405 = 136080
Step 337: 136080 + 405 = 136485
Step 338: 136485 + 405 = 136890
Step 339: 136890 + 405 = 137295
Step 340: 137295 + 405 = 137700
Step 341: 137700 + 405 = 138105
Step 342: 138105 + 405 = 138510
Step 343: 138510 + 405 = 138915
Step 344: 138915 + 405 = 139320
Step 345: 139320 + 405 = 139725
Step 346: 139725 + 405 = 140130
Step 347: 140130 + 405 = 140535
Step 348: 140535 + 405 = 140940
Step 349: 140940 + 405 = 141345
Step 350: 141345 + 405 = 141750
Step 351: 141750 + 405 = 142155
Step 352: 142155 + 405 = 142560
Step 353: 142560 + 405 = 142965
Step 354: 142965 + 405 = 143370
Step 355: 143370 + 405 = 143775
Step 356: 143775 + 405 = 144180
Step 357: 144180 + 405 = 144585
Step 358: 144585 + 405 = 144990
Step 359: 144990 + 405 = 145395
Step 360: 145395 + 405 = 145800
Step 361: 145800 + 405 = 146205
Step 362: 146205 + 405 = 146610
Step 363: 146610 + 405 = 147015
Step 364: 147015 + 405 = 147420
Step 365: 147420 + 405 = 147825
Step 366: 147825 + 405 = 148230
Step 367: 148230 + 405 = 148635
Step 368: 148635 + 405 = 149040
Step 369: 149040 + 405 = 149445
Step 370: 149445 + 405 = 149850
Step 371: 149850 + 405 = 150255
Step 372: 150255 + 405 = 150660
Step 373: 150660 + 405 = 151065
Step 374: 151065 + 405 = 151470
Step 375: 151470 + 405 = 151875
Step 376: 151875 + 405 = 152280
Step 377: 152280 + 405 = 152685
Step 378: 152685 + 405 = 153090
Step 379: 153090 + 405 = 153495
Step 380: 153495 + 405 = 153900
Step 381: 153900 + 405 = 154305
Step 382: 154305 + 405 = 154710
Step 383: 154710 + 405 = 155115
Step 384: 155115 + 405 = 155520
Step 385: 155520 + 405 = 155925
Step 386: 155925 + 405 = 156330
Step 387: 156330 + 405 = 156735
Step 388: 156735 + 405 = 157140
Step 389: 157140 + 405 = 157545
Step 390: 157545 + 405 = 157950
Step 391: 157950 + 405 = 158355
Step 392: 158355 + 405 = 158760
Step 393: 158760 + 405 = 159165
Step 394: 159165 + 405 = 159570
Step 395: 159570 + 405 = 159975
Step 396: 159975 + 405 = 160380
Step 397: 160380 + 405 = 160785
Step 398: 160785 + 405 = 161190
Step 399: 161190 + 405 = 161595
Step 400: 161595 + 405 = 162000
Step 401: 162000 + 405 = 162405
Step 402: 162405 + 405 = 162810
Step 403: 162810 + 405 = 163215
Step 404: 163215 + 405 = 163620
Step 405: 163620 + 405 = 164025
Step 406: 164025 + 405 = 164430
Step 407: 164430 + 405 = 164835
Step 408: 164835 + 405 = 165240
Step 409: 165240 + 405 = 165645
Step 410: 165645 + 405 = 166050
Step 411: 166050 + 405 = 166455
Step 412: 166455 + 405 = 166860
Step 413: 166860 + 405 = 167265
Step 414: 167265 + 405 = 167670
Step 415: 167670 + 405 = 168075
Step 416: 168075 + 405 = 168480
Step 417: 168480 + 405 = 168885
Step 418: 168885 + 405 = 169290
Step 419: 169290 + 405 = 169695
Step 420: 169695 + 405 = 170100
Step 421: 170100 + 405 = 170505
Step 422: 170505 + 405 = 170910

So, 405*422 = 170910