OK, let's crack this. We're given 45 and our task is to multiply it by 454. Essentially, we'll be adding 45 to itself 454 times.
Step 1: 0 + 45 = 45
Step 2: 45 + 45 = 90
Step 3: 90 + 45 = 135
Step 4: 135 + 45 = 180
Step 5: 180 + 45 = 225
Step 6: 225 + 45 = 270
Step 7: 270 + 45 = 315
Step 8: 315 + 45 = 360
Step 9: 360 + 45 = 405
Step 10: 405 + 45 = 450
Step 11: 450 + 45 = 495
Step 12: 495 + 45 = 540
Step 13: 540 + 45 = 585
Step 14: 585 + 45 = 630
Step 15: 630 + 45 = 675
Step 16: 675 + 45 = 720
Step 17: 720 + 45 = 765
Step 18: 765 + 45 = 810
Step 19: 810 + 45 = 855
Step 20: 855 + 45 = 900
Step 21: 900 + 45 = 945
Step 22: 945 + 45 = 990
Step 23: 990 + 45 = 1035
Step 24: 1035 + 45 = 1080
Step 25: 1080 + 45 = 1125
Step 26: 1125 + 45 = 1170
Step 27: 1170 + 45 = 1215
Step 28: 1215 + 45 = 1260
Step 29: 1260 + 45 = 1305
Step 30: 1305 + 45 = 1350
Step 31: 1350 + 45 = 1395
Step 32: 1395 + 45 = 1440
Step 33: 1440 + 45 = 1485
Step 34: 1485 + 45 = 1530
Step 35: 1530 + 45 = 1575
Step 36: 1575 + 45 = 1620
Step 37: 1620 + 45 = 1665
Step 38: 1665 + 45 = 1710
Step 39: 1710 + 45 = 1755
Step 40: 1755 + 45 = 1800
Step 41: 1800 + 45 = 1845
Step 42: 1845 + 45 = 1890
Step 43: 1890 + 45 = 1935
Step 44: 1935 + 45 = 1980
Step 45: 1980 + 45 = 2025
Step 46: 2025 + 45 = 2070
Step 47: 2070 + 45 = 2115
Step 48: 2115 + 45 = 2160
Step 49: 2160 + 45 = 2205
Step 50: 2205 + 45 = 2250
Step 51: 2250 + 45 = 2295
Step 52: 2295 + 45 = 2340
Step 53: 2340 + 45 = 2385
Step 54: 2385 + 45 = 2430
Step 55: 2430 + 45 = 2475
Step 56: 2475 + 45 = 2520
Step 57: 2520 + 45 = 2565
Step 58: 2565 + 45 = 2610
Step 59: 2610 + 45 = 2655
Step 60: 2655 + 45 = 2700
Step 61: 2700 + 45 = 2745
Step 62: 2745 + 45 = 2790
Step 63: 2790 + 45 = 2835
Step 64: 2835 + 45 = 2880
Step 65: 2880 + 45 = 2925
Step 66: 2925 + 45 = 2970
Step 67: 2970 + 45 = 3015
Step 68: 3015 + 45 = 3060
Step 69: 3060 + 45 = 3105
Step 70: 3105 + 45 = 3150
Step 71: 3150 + 45 = 3195
Step 72: 3195 + 45 = 3240
Step 73: 3240 + 45 = 3285
Step 74: 3285 + 45 = 3330
Step 75: 3330 + 45 = 3375
Step 76: 3375 + 45 = 3420
Step 77: 3420 + 45 = 3465
Step 78: 3465 + 45 = 3510
Step 79: 3510 + 45 = 3555
Step 80: 3555 + 45 = 3600
Step 81: 3600 + 45 = 3645
Step 82: 3645 + 45 = 3690
Step 83: 3690 + 45 = 3735
Step 84: 3735 + 45 = 3780
Step 85: 3780 + 45 = 3825
Step 86: 3825 + 45 = 3870
Step 87: 3870 + 45 = 3915
Step 88: 3915 + 45 = 3960
Step 89: 3960 + 45 = 4005
Step 90: 4005 + 45 = 4050
Step 91: 4050 + 45 = 4095
Step 92: 4095 + 45 = 4140
Step 93: 4140 + 45 = 4185
Step 94: 4185 + 45 = 4230
Step 95: 4230 + 45 = 4275
Step 96: 4275 + 45 = 4320
Step 97: 4320 + 45 = 4365
Step 98: 4365 + 45 = 4410
Step 99: 4410 + 45 = 4455
Step 100: 4455 + 45 = 4500
Step 101: 4500 + 45 = 4545
Step 102: 4545 + 45 = 4590
Step 103: 4590 + 45 = 4635
Step 104: 4635 + 45 = 4680
Step 105: 4680 + 45 = 4725
Step 106: 4725 + 45 = 4770
Step 107: 4770 + 45 = 4815
Step 108: 4815 + 45 = 4860
Step 109: 4860 + 45 = 4905
Step 110: 4905 + 45 = 4950
Step 111: 4950 + 45 = 4995
Step 112: 4995 + 45 = 5040
Step 113: 5040 + 45 = 5085
Step 114: 5085 + 45 = 5130
Step 115: 5130 + 45 = 5175
Step 116: 5175 + 45 = 5220
Step 117: 5220 + 45 = 5265
Step 118: 5265 + 45 = 5310
Step 119: 5310 + 45 = 5355
Step 120: 5355 + 45 = 5400
Step 121: 5400 + 45 = 5445
Step 122: 5445 + 45 = 5490
Step 123: 5490 + 45 = 5535
Step 124: 5535 + 45 = 5580
Step 125: 5580 + 45 = 5625
Step 126: 5625 + 45 = 5670
Step 127: 5670 + 45 = 5715
Step 128: 5715 + 45 = 5760
Step 129: 5760 + 45 = 5805
Step 130: 5805 + 45 = 5850
Step 131: 5850 + 45 = 5895
Step 132: 5895 + 45 = 5940
Step 133: 5940 + 45 = 5985
Step 134: 5985 + 45 = 6030
Step 135: 6030 + 45 = 6075
Step 136: 6075 + 45 = 6120
Step 137: 6120 + 45 = 6165
Step 138: 6165 + 45 = 6210
Step 139: 6210 + 45 = 6255
Step 140: 6255 + 45 = 6300
Step 141: 6300 + 45 = 6345
Step 142: 6345 + 45 = 6390
Step 143: 6390 + 45 = 6435
Step 144: 6435 + 45 = 6480
Step 145: 6480 + 45 = 6525
Step 146: 6525 + 45 = 6570
Step 147: 6570 + 45 = 6615
Step 148: 6615 + 45 = 6660
Step 149: 6660 + 45 = 6705
Step 150: 6705 + 45 = 6750
Step 151: 6750 + 45 = 6795
Step 152: 6795 + 45 = 6840
Step 153: 6840 + 45 = 6885
Step 154: 6885 + 45 = 6930
Step 155: 6930 + 45 = 6975
Step 156: 6975 + 45 = 7020
Step 157: 7020 + 45 = 7065
Step 158: 7065 + 45 = 7110
Step 159: 7110 + 45 = 7155
Step 160: 7155 + 45 = 7200
Step 161: 7200 + 45 = 7245
Step 162: 7245 + 45 = 7290
Step 163: 7290 + 45 = 7335
Step 164: 7335 + 45 = 7380
Step 165: 7380 + 45 = 7425
Step 166: 7425 + 45 = 7470
Step 167: 7470 + 45 = 7515
Step 168: 7515 + 45 = 7560
Step 169: 7560 + 45 = 7605
Step 170: 7605 + 45 = 7650
Step 171: 7650 + 45 = 7695
Step 172: 7695 + 45 = 7740
Step 173: 7740 + 45 = 7785
Step 174: 7785 + 45 = 7830
Step 175: 7830 + 45 = 7875
Step 176: 7875 + 45 = 7920
Step 177: 7920 + 45 = 7965
Step 178: 7965 + 45 = 8010
Step 179: 8010 + 45 = 8055
Step 180: 8055 + 45 = 8100
Step 181: 8100 + 45 = 8145
Step 182: 8145 + 45 = 8190
Step 183: 8190 + 45 = 8235
Step 184: 8235 + 45 = 8280
Step 185: 8280 + 45 = 8325
Step 186: 8325 + 45 = 8370
Step 187: 8370 + 45 = 8415
Step 188: 8415 + 45 = 8460
Step 189: 8460 + 45 = 8505
Step 190: 8505 + 45 = 8550
Step 191: 8550 + 45 = 8595
Step 192: 8595 + 45 = 8640
Step 193: 8640 + 45 = 8685
Step 194: 8685 + 45 = 8730
Step 195: 8730 + 45 = 8775
Step 196: 8775 + 45 = 8820
Step 197: 8820 + 45 = 8865
Step 198: 8865 + 45 = 8910
Step 199: 8910 + 45 = 8955
Step 200: 8955 + 45 = 9000
Step 201: 9000 + 45 = 9045
Step 202: 9045 + 45 = 9090
Step 203: 9090 + 45 = 9135
Step 204: 9135 + 45 = 9180
Step 205: 9180 + 45 = 9225
Step 206: 9225 + 45 = 9270
Step 207: 9270 + 45 = 9315
Step 208: 9315 + 45 = 9360
Step 209: 9360 + 45 = 9405
Step 210: 9405 + 45 = 9450
Step 211: 9450 + 45 = 9495
Step 212: 9495 + 45 = 9540
Step 213: 9540 + 45 = 9585
Step 214: 9585 + 45 = 9630
Step 215: 9630 + 45 = 9675
Step 216: 9675 + 45 = 9720
Step 217: 9720 + 45 = 9765
Step 218: 9765 + 45 = 9810
Step 219: 9810 + 45 = 9855
Step 220: 9855 + 45 = 9900
Step 221: 9900 + 45 = 9945
Step 222: 9945 + 45 = 9990
Step 223: 9990 + 45 = 10035
Step 224: 10035 + 45 = 10080
Step 225: 10080 + 45 = 10125
Step 226: 10125 + 45 = 10170
Step 227: 10170 + 45 = 10215
Step 228: 10215 + 45 = 10260
Step 229: 10260 + 45 = 10305
Step 230: 10305 + 45 = 10350
Step 231: 10350 + 45 = 10395
Step 232: 10395 + 45 = 10440
Step 233: 10440 + 45 = 10485
Step 234: 10485 + 45 = 10530
Step 235: 10530 + 45 = 10575
Step 236: 10575 + 45 = 10620
Step 237: 10620 + 45 = 10665
Step 238: 10665 + 45 = 10710
Step 239: 10710 + 45 = 10755
Step 240: 10755 + 45 = 10800
Step 241: 10800 + 45 = 10845
Step 242: 10845 + 45 = 10890
Step 243: 10890 + 45 = 10935
Step 244: 10935 + 45 = 10980
Step 245: 10980 + 45 = 11025
Step 246: 11025 + 45 = 11070
Step 247: 11070 + 45 = 11115
Step 248: 11115 + 45 = 11160
Step 249: 11160 + 45 = 11205
Step 250: 11205 + 45 = 11250
Step 251: 11250 + 45 = 11295
Step 252: 11295 + 45 = 11340
Step 253: 11340 + 45 = 11385
Step 254: 11385 + 45 = 11430
Step 255: 11430 + 45 = 11475
Step 256: 11475 + 45 = 11520
Step 257: 11520 + 45 = 11565
Step 258: 11565 + 45 = 11610
Step 259: 11610 + 45 = 11655
Step 260: 11655 + 45 = 11700
Step 261: 11700 + 45 = 11745
Step 262: 11745 + 45 = 11790
Step 263: 11790 + 45 = 11835
Step 264: 11835 + 45 = 11880
Step 265: 11880 + 45 = 11925
Step 266: 11925 + 45 = 11970
Step 267: 11970 + 45 = 12015
Step 268: 12015 + 45 = 12060
Step 269: 12060 + 45 = 12105
Step 270: 12105 + 45 = 12150
Step 271: 12150 + 45 = 12195
Step 272: 12195 + 45 = 12240
Step 273: 12240 + 45 = 12285
Step 274: 12285 + 45 = 12330
Step 275: 12330 + 45 = 12375
Step 276: 12375 + 45 = 12420
Step 277: 12420 + 45 = 12465
Step 278: 12465 + 45 = 12510
Step 279: 12510 + 45 = 12555
Step 280: 12555 + 45 = 12600
Step 281: 12600 + 45 = 12645
Step 282: 12645 + 45 = 12690
Step 283: 12690 + 45 = 12735
Step 284: 12735 + 45 = 12780
Step 285: 12780 + 45 = 12825
Step 286: 12825 + 45 = 12870
Step 287: 12870 + 45 = 12915
Step 288: 12915 + 45 = 12960
Step 289: 12960 + 45 = 13005
Step 290: 13005 + 45 = 13050
Step 291: 13050 + 45 = 13095
Step 292: 13095 + 45 = 13140
Step 293: 13140 + 45 = 13185
Step 294: 13185 + 45 = 13230
Step 295: 13230 + 45 = 13275
Step 296: 13275 + 45 = 13320
Step 297: 13320 + 45 = 13365
Step 298: 13365 + 45 = 13410
Step 299: 13410 + 45 = 13455
Step 300: 13455 + 45 = 13500
Step 301: 13500 + 45 = 13545
Step 302: 13545 + 45 = 13590
Step 303: 13590 + 45 = 13635
Step 304: 13635 + 45 = 13680
Step 305: 13680 + 45 = 13725
Step 306: 13725 + 45 = 13770
Step 307: 13770 + 45 = 13815
Step 308: 13815 + 45 = 13860
Step 309: 13860 + 45 = 13905
Step 310: 13905 + 45 = 13950
Step 311: 13950 + 45 = 13995
Step 312: 13995 + 45 = 14040
Step 313: 14040 + 45 = 14085
Step 314: 14085 + 45 = 14130
Step 315: 14130 + 45 = 14175
Step 316: 14175 + 45 = 14220
Step 317: 14220 + 45 = 14265
Step 318: 14265 + 45 = 14310
Step 319: 14310 + 45 = 14355
Step 320: 14355 + 45 = 14400
Step 321: 14400 + 45 = 14445
Step 322: 14445 + 45 = 14490
Step 323: 14490 + 45 = 14535
Step 324: 14535 + 45 = 14580
Step 325: 14580 + 45 = 14625
Step 326: 14625 + 45 = 14670
Step 327: 14670 + 45 = 14715
Step 328: 14715 + 45 = 14760
Step 329: 14760 + 45 = 14805
Step 330: 14805 + 45 = 14850
Step 331: 14850 + 45 = 14895
Step 332: 14895 + 45 = 14940
Step 333: 14940 + 45 = 14985
Step 334: 14985 + 45 = 15030
Step 335: 15030 + 45 = 15075
Step 336: 15075 + 45 = 15120
Step 337: 15120 + 45 = 15165
Step 338: 15165 + 45 = 15210
Step 339: 15210 + 45 = 15255
Step 340: 15255 + 45 = 15300
Step 341: 15300 + 45 = 15345
Step 342: 15345 + 45 = 15390
Step 343: 15390 + 45 = 15435
Step 344: 15435 + 45 = 15480
Step 345: 15480 + 45 = 15525
Step 346: 15525 + 45 = 15570
Step 347: 15570 + 45 = 15615
Step 348: 15615 + 45 = 15660
Step 349: 15660 + 45 = 15705
Step 350: 15705 + 45 = 15750
Step 351: 15750 + 45 = 15795
Step 352: 15795 + 45 = 15840
Step 353: 15840 + 45 = 15885
Step 354: 15885 + 45 = 15930
Step 355: 15930 + 45 = 15975
Step 356: 15975 + 45 = 16020
Step 357: 16020 + 45 = 16065
Step 358: 16065 + 45 = 16110
Step 359: 16110 + 45 = 16155
Step 360: 16155 + 45 = 16200
Step 361: 16200 + 45 = 16245
Step 362: 16245 + 45 = 16290
Step 363: 16290 + 45 = 16335
Step 364: 16335 + 45 = 16380
Step 365: 16380 + 45 = 16425
Step 366: 16425 + 45 = 16470
Step 367: 16470 + 45 = 16515
Step 368: 16515 + 45 = 16560
Step 369: 16560 + 45 = 16605
Step 370: 16605 + 45 = 16650
Step 371: 16650 + 45 = 16695
Step 372: 16695 + 45 = 16740
Step 373: 16740 + 45 = 16785
Step 374: 16785 + 45 = 16830
Step 375: 16830 + 45 = 16875
Step 376: 16875 + 45 = 16920
Step 377: 16920 + 45 = 16965
Step 378: 16965 + 45 = 17010
Step 379: 17010 + 45 = 17055
Step 380: 17055 + 45 = 17100
Step 381: 17100 + 45 = 17145
Step 382: 17145 + 45 = 17190
Step 383: 17190 + 45 = 17235
Step 384: 17235 + 45 = 17280
Step 385: 17280 + 45 = 17325
Step 386: 17325 + 45 = 17370
Step 387: 17370 + 45 = 17415
Step 388: 17415 + 45 = 17460
Step 389: 17460 + 45 = 17505
Step 390: 17505 + 45 = 17550
Step 391: 17550 + 45 = 17595
Step 392: 17595 + 45 = 17640
Step 393: 17640 + 45 = 17685
Step 394: 17685 + 45 = 17730
Step 395: 17730 + 45 = 17775
Step 396: 17775 + 45 = 17820
Step 397: 17820 + 45 = 17865
Step 398: 17865 + 45 = 17910
Step 399: 17910 + 45 = 17955
Step 400: 17955 + 45 = 18000
Step 401: 18000 + 45 = 18045
Step 402: 18045 + 45 = 18090
Step 403: 18090 + 45 = 18135
Step 404: 18135 + 45 = 18180
Step 405: 18180 + 45 = 18225
Step 406: 18225 + 45 = 18270
Step 407: 18270 + 45 = 18315
Step 408: 18315 + 45 = 18360
Step 409: 18360 + 45 = 18405
Step 410: 18405 + 45 = 18450
Step 411: 18450 + 45 = 18495
Step 412: 18495 + 45 = 18540
Step 413: 18540 + 45 = 18585
Step 414: 18585 + 45 = 18630
Step 415: 18630 + 45 = 18675
Step 416: 18675 + 45 = 18720
Step 417: 18720 + 45 = 18765
Step 418: 18765 + 45 = 18810
Step 419: 18810 + 45 = 18855
Step 420: 18855 + 45 = 18900
Step 421: 18900 + 45 = 18945
Step 422: 18945 + 45 = 18990
Step 423: 18990 + 45 = 19035
Step 424: 19035 + 45 = 19080
Step 425: 19080 + 45 = 19125
Step 426: 19125 + 45 = 19170
Step 427: 19170 + 45 = 19215
Step 428: 19215 + 45 = 19260
Step 429: 19260 + 45 = 19305
Step 430: 19305 + 45 = 19350
Step 431: 19350 + 45 = 19395
Step 432: 19395 + 45 = 19440
Step 433: 19440 + 45 = 19485
Step 434: 19485 + 45 = 19530
Step 435: 19530 + 45 = 19575
Step 436: 19575 + 45 = 19620
Step 437: 19620 + 45 = 19665
Step 438: 19665 + 45 = 19710
Step 439: 19710 + 45 = 19755
Step 440: 19755 + 45 = 19800
Step 441: 19800 + 45 = 19845
Step 442: 19845 + 45 = 19890
Step 443: 19890 + 45 = 19935
Step 444: 19935 + 45 = 19980
Step 445: 19980 + 45 = 20025
Step 446: 20025 + 45 = 20070
Step 447: 20070 + 45 = 20115
Step 448: 20115 + 45 = 20160
Step 449: 20160 + 45 = 20205
Step 450: 20205 + 45 = 20250
Step 451: 20250 + 45 = 20295
Step 452: 20295 + 45 = 20340
Step 453: 20340 + 45 = 20385
Step 454: 20385 + 45 = 20430

So, 45*454 = 20430