OK, let's work through this together. We're starting with 55 and we're going to multiply it by 455, which means we add 55 to itself 455 times.
Step 1: 0 + 55 = 55
Step 2: 55 + 55 = 110
Step 3: 110 + 55 = 165
Step 4: 165 + 55 = 220
Step 5: 220 + 55 = 275
Step 6: 275 + 55 = 330
Step 7: 330 + 55 = 385
Step 8: 385 + 55 = 440
Step 9: 440 + 55 = 495
Step 10: 495 + 55 = 550
Step 11: 550 + 55 = 605
Step 12: 605 + 55 = 660
Step 13: 660 + 55 = 715
Step 14: 715 + 55 = 770
Step 15: 770 + 55 = 825
Step 16: 825 + 55 = 880
Step 17: 880 + 55 = 935
Step 18: 935 + 55 = 990
Step 19: 990 + 55 = 1045
Step 20: 1045 + 55 = 1100
Step 21: 1100 + 55 = 1155
Step 22: 1155 + 55 = 1210
Step 23: 1210 + 55 = 1265
Step 24: 1265 + 55 = 1320
Step 25: 1320 + 55 = 1375
Step 26: 1375 + 55 = 1430
Step 27: 1430 + 55 = 1485
Step 28: 1485 + 55 = 1540
Step 29: 1540 + 55 = 1595
Step 30: 1595 + 55 = 1650
Step 31: 1650 + 55 = 1705
Step 32: 1705 + 55 = 1760
Step 33: 1760 + 55 = 1815
Step 34: 1815 + 55 = 1870
Step 35: 1870 + 55 = 1925
Step 36: 1925 + 55 = 1980
Step 37: 1980 + 55 = 2035
Step 38: 2035 + 55 = 2090
Step 39: 2090 + 55 = 2145
Step 40: 2145 + 55 = 2200
Step 41: 2200 + 55 = 2255
Step 42: 2255 + 55 = 2310
Step 43: 2310 + 55 = 2365
Step 44: 2365 + 55 = 2420
Step 45: 2420 + 55 = 2475
Step 46: 2475 + 55 = 2530
Step 47: 2530 + 55 = 2585
Step 48: 2585 + 55 = 2640
Step 49: 2640 + 55 = 2695
Step 50: 2695 + 55 = 2750
Step 51: 2750 + 55 = 2805
Step 52: 2805 + 55 = 2860
Step 53: 2860 + 55 = 2915
Step 54: 2915 + 55 = 2970
Step 55: 2970 + 55 = 3025
Step 56: 3025 + 55 = 3080
Step 57: 3080 + 55 = 3135
Step 58: 3135 + 55 = 3190
Step 59: 3190 + 55 = 3245
Step 60: 3245 + 55 = 3300
Step 61: 3300 + 55 = 3355
Step 62: 3355 + 55 = 3410
Step 63: 3410 + 55 = 3465
Step 64: 3465 + 55 = 3520
Step 65: 3520 + 55 = 3575
Step 66: 3575 + 55 = 3630
Step 67: 3630 + 55 = 3685
Step 68: 3685 + 55 = 3740
Step 69: 3740 + 55 = 3795
Step 70: 3795 + 55 = 3850
Step 71: 3850 + 55 = 3905
Step 72: 3905 + 55 = 3960
Step 73: 3960 + 55 = 4015
Step 74: 4015 + 55 = 4070
Step 75: 4070 + 55 = 4125
Step 76: 4125 + 55 = 4180
Step 77: 4180 + 55 = 4235
Step 78: 4235 + 55 = 4290
Step 79: 4290 + 55 = 4345
Step 80: 4345 + 55 = 4400
Step 81: 4400 + 55 = 4455
Step 82: 4455 + 55 = 4510
Step 83: 4510 + 55 = 4565
Step 84: 4565 + 55 = 4620
Step 85: 4620 + 55 = 4675
Step 86: 4675 + 55 = 4730
Step 87: 4730 + 55 = 4785
Step 88: 4785 + 55 = 4840
Step 89: 4840 + 55 = 4895
Step 90: 4895 + 55 = 4950
Step 91: 4950 + 55 = 5005
Step 92: 5005 + 55 = 5060
Step 93: 5060 + 55 = 5115
Step 94: 5115 + 55 = 5170
Step 95: 5170 + 55 = 5225
Step 96: 5225 + 55 = 5280
Step 97: 5280 + 55 = 5335
Step 98: 5335 + 55 = 5390
Step 99: 5390 + 55 = 5445
Step 100: 5445 + 55 = 5500
Step 101: 5500 + 55 = 5555
Step 102: 5555 + 55 = 5610
Step 103: 5610 + 55 = 5665
Step 104: 5665 + 55 = 5720
Step 105: 5720 + 55 = 5775
Step 106: 5775 + 55 = 5830
Step 107: 5830 + 55 = 5885
Step 108: 5885 + 55 = 5940
Step 109: 5940 + 55 = 5995
Step 110: 5995 + 55 = 6050
Step 111: 6050 + 55 = 6105
Step 112: 6105 + 55 = 6160
Step 113: 6160 + 55 = 6215
Step 114: 6215 + 55 = 6270
Step 115: 6270 + 55 = 6325
Step 116: 6325 + 55 = 6380
Step 117: 6380 + 55 = 6435
Step 118: 6435 + 55 = 6490
Step 119: 6490 + 55 = 6545
Step 120: 6545 + 55 = 6600
Step 121: 6600 + 55 = 6655
Step 122: 6655 + 55 = 6710
Step 123: 6710 + 55 = 6765
Step 124: 6765 + 55 = 6820
Step 125: 6820 + 55 = 6875
Step 126: 6875 + 55 = 6930
Step 127: 6930 + 55 = 6985
Step 128: 6985 + 55 = 7040
Step 129: 7040 + 55 = 7095
Step 130: 7095 + 55 = 7150
Step 131: 7150 + 55 = 7205
Step 132: 7205 + 55 = 7260
Step 133: 7260 + 55 = 7315
Step 134: 7315 + 55 = 7370
Step 135: 7370 + 55 = 7425
Step 136: 7425 + 55 = 7480
Step 137: 7480 + 55 = 7535
Step 138: 7535 + 55 = 7590
Step 139: 7590 + 55 = 7645
Step 140: 7645 + 55 = 7700
Step 141: 7700 + 55 = 7755
Step 142: 7755 + 55 = 7810
Step 143: 7810 + 55 = 7865
Step 144: 7865 + 55 = 7920
Step 145: 7920 + 55 = 7975
Step 146: 7975 + 55 = 8030
Step 147: 8030 + 55 = 8085
Step 148: 8085 + 55 = 8140
Step 149: 8140 + 55 = 8195
Step 150: 8195 + 55 = 8250
Step 151: 8250 + 55 = 8305
Step 152: 8305 + 55 = 8360
Step 153: 8360 + 55 = 8415
Step 154: 8415 + 55 = 8470
Step 155: 8470 + 55 = 8525
Step 156: 8525 + 55 = 8580
Step 157: 8580 + 55 = 8635
Step 158: 8635 + 55 = 8690
Step 159: 8690 + 55 = 8745
Step 160: 8745 + 55 = 8800
Step 161: 8800 + 55 = 8855
Step 162: 8855 + 55 = 8910
Step 163: 8910 + 55 = 8965
Step 164: 8965 + 55 = 9020
Step 165: 9020 + 55 = 9075
Step 166: 9075 + 55 = 9130
Step 167: 9130 + 55 = 9185
Step 168: 9185 + 55 = 9240
Step 169: 9240 + 55 = 9295
Step 170: 9295 + 55 = 9350
Step 171: 9350 + 55 = 9405
Step 172: 9405 + 55 = 9460
Step 173: 9460 + 55 = 9515
Step 174: 9515 + 55 = 9570
Step 175: 9570 + 55 = 9625
Step 176: 9625 + 55 = 9680
Step 177: 9680 + 55 = 9735
Step 178: 9735 + 55 = 9790
Step 179: 9790 + 55 = 9845
Step 180: 9845 + 55 = 9900
Step 181: 9900 + 55 = 9955
Step 182: 9955 + 55 = 10010
Step 183: 10010 + 55 = 10065
Step 184: 10065 + 55 = 10120
Step 185: 10120 + 55 = 10175
Step 186: 10175 + 55 = 10230
Step 187: 10230 + 55 = 10285
Step 188: 10285 + 55 = 10340
Step 189: 10340 + 55 = 10395
Step 190: 10395 + 55 = 10450
Step 191: 10450 + 55 = 10505
Step 192: 10505 + 55 = 10560
Step 193: 10560 + 55 = 10615
Step 194: 10615 + 55 = 10670
Step 195: 10670 + 55 = 10725
Step 196: 10725 + 55 = 10780
Step 197: 10780 + 55 = 10835
Step 198: 10835 + 55 = 10890
Step 199: 10890 + 55 = 10945
Step 200: 10945 + 55 = 11000
Step 201: 11000 + 55 = 11055
Step 202: 11055 + 55 = 11110
Step 203: 11110 + 55 = 11165
Step 204: 11165 + 55 = 11220
Step 205: 11220 + 55 = 11275
Step 206: 11275 + 55 = 11330
Step 207: 11330 + 55 = 11385
Step 208: 11385 + 55 = 11440
Step 209: 11440 + 55 = 11495
Step 210: 11495 + 55 = 11550
Step 211: 11550 + 55 = 11605
Step 212: 11605 + 55 = 11660
Step 213: 11660 + 55 = 11715
Step 214: 11715 + 55 = 11770
Step 215: 11770 + 55 = 11825
Step 216: 11825 + 55 = 11880
Step 217: 11880 + 55 = 11935
Step 218: 11935 + 55 = 11990
Step 219: 11990 + 55 = 12045
Step 220: 12045 + 55 = 12100
Step 221: 12100 + 55 = 12155
Step 222: 12155 + 55 = 12210
Step 223: 12210 + 55 = 12265
Step 224: 12265 + 55 = 12320
Step 225: 12320 + 55 = 12375
Step 226: 12375 + 55 = 12430
Step 227: 12430 + 55 = 12485
Step 228: 12485 + 55 = 12540
Step 229: 12540 + 55 = 12595
Step 230: 12595 + 55 = 12650
Step 231: 12650 + 55 = 12705
Step 232: 12705 + 55 = 12760
Step 233: 12760 + 55 = 12815
Step 234: 12815 + 55 = 12870
Step 235: 12870 + 55 = 12925
Step 236: 12925 + 55 = 12980
Step 237: 12980 + 55 = 13035
Step 238: 13035 + 55 = 13090
Step 239: 13090 + 55 = 13145
Step 240: 13145 + 55 = 13200
Step 241: 13200 + 55 = 13255
Step 242: 13255 + 55 = 13310
Step 243: 13310 + 55 = 13365
Step 244: 13365 + 55 = 13420
Step 245: 13420 + 55 = 13475
Step 246: 13475 + 55 = 13530
Step 247: 13530 + 55 = 13585
Step 248: 13585 + 55 = 13640
Step 249: 13640 + 55 = 13695
Step 250: 13695 + 55 = 13750
Step 251: 13750 + 55 = 13805
Step 252: 13805 + 55 = 13860
Step 253: 13860 + 55 = 13915
Step 254: 13915 + 55 = 13970
Step 255: 13970 + 55 = 14025
Step 256: 14025 + 55 = 14080
Step 257: 14080 + 55 = 14135
Step 258: 14135 + 55 = 14190
Step 259: 14190 + 55 = 14245
Step 260: 14245 + 55 = 14300
Step 261: 14300 + 55 = 14355
Step 262: 14355 + 55 = 14410
Step 263: 14410 + 55 = 14465
Step 264: 14465 + 55 = 14520
Step 265: 14520 + 55 = 14575
Step 266: 14575 + 55 = 14630
Step 267: 14630 + 55 = 14685
Step 268: 14685 + 55 = 14740
Step 269: 14740 + 55 = 14795
Step 270: 14795 + 55 = 14850
Step 271: 14850 + 55 = 14905
Step 272: 14905 + 55 = 14960
Step 273: 14960 + 55 = 15015
Step 274: 15015 + 55 = 15070
Step 275: 15070 + 55 = 15125
Step 276: 15125 + 55 = 15180
Step 277: 15180 + 55 = 15235
Step 278: 15235 + 55 = 15290
Step 279: 15290 + 55 = 15345
Step 280: 15345 + 55 = 15400
Step 281: 15400 + 55 = 15455
Step 282: 15455 + 55 = 15510
Step 283: 15510 + 55 = 15565
Step 284: 15565 + 55 = 15620
Step 285: 15620 + 55 = 15675
Step 286: 15675 + 55 = 15730
Step 287: 15730 + 55 = 15785
Step 288: 15785 + 55 = 15840
Step 289: 15840 + 55 = 15895
Step 290: 15895 + 55 = 15950
Step 291: 15950 + 55 = 16005
Step 292: 16005 + 55 = 16060
Step 293: 16060 + 55 = 16115
Step 294: 16115 + 55 = 16170
Step 295: 16170 + 55 = 16225
Step 296: 16225 + 55 = 16280
Step 297: 16280 + 55 = 16335
Step 298: 16335 + 55 = 16390
Step 299: 16390 + 55 = 16445
Step 300: 16445 + 55 = 16500
Step 301: 16500 + 55 = 16555
Step 302: 16555 + 55 = 16610
Step 303: 16610 + 55 = 16665
Step 304: 16665 + 55 = 16720
Step 305: 16720 + 55 = 16775
Step 306: 16775 + 55 = 16830
Step 307: 16830 + 55 = 16885
Step 308: 16885 + 55 = 16940
Step 309: 16940 + 55 = 16995
Step 310: 16995 + 55 = 17050
Step 311: 17050 + 55 = 17105
Step 312: 17105 + 55 = 17160
Step 313: 17160 + 55 = 17215
Step 314: 17215 + 55 = 17270
Step 315: 17270 + 55 = 17325
Step 316: 17325 + 55 = 17380
Step 317: 17380 + 55 = 17435
Step 318: 17435 + 55 = 17490
Step 319: 17490 + 55 = 17545
Step 320: 17545 + 55 = 17600
Step 321: 17600 + 55 = 17655
Step 322: 17655 + 55 = 17710
Step 323: 17710 + 55 = 17765
Step 324: 17765 + 55 = 17820
Step 325: 17820 + 55 = 17875
Step 326: 17875 + 55 = 17930
Step 327: 17930 + 55 = 17985
Step 328: 17985 + 55 = 18040
Step 329: 18040 + 55 = 18095
Step 330: 18095 + 55 = 18150
Step 331: 18150 + 55 = 18205
Step 332: 18205 + 55 = 18260
Step 333: 18260 + 55 = 18315
Step 334: 18315 + 55 = 18370
Step 335: 18370 + 55 = 18425
Step 336: 18425 + 55 = 18480
Step 337: 18480 + 55 = 18535
Step 338: 18535 + 55 = 18590
Step 339: 18590 + 55 = 18645
Step 340: 18645 + 55 = 18700
Step 341: 18700 + 55 = 18755
Step 342: 18755 + 55 = 18810
Step 343: 18810 + 55 = 18865
Step 344: 18865 + 55 = 18920
Step 345: 18920 + 55 = 18975
Step 346: 18975 + 55 = 19030
Step 347: 19030 + 55 = 19085
Step 348: 19085 + 55 = 19140
Step 349: 19140 + 55 = 19195
Step 350: 19195 + 55 = 19250
Step 351: 19250 + 55 = 19305
Step 352: 19305 + 55 = 19360
Step 353: 19360 + 55 = 19415
Step 354: 19415 + 55 = 19470
Step 355: 19470 + 55 = 19525
Step 356: 19525 + 55 = 19580
Step 357: 19580 + 55 = 19635
Step 358: 19635 + 55 = 19690
Step 359: 19690 + 55 = 19745
Step 360: 19745 + 55 = 19800
Step 361: 19800 + 55 = 19855
Step 362: 19855 + 55 = 19910
Step 363: 19910 + 55 = 19965
Step 364: 19965 + 55 = 20020
Step 365: 20020 + 55 = 20075
Step 366: 20075 + 55 = 20130
Step 367: 20130 + 55 = 20185
Step 368: 20185 + 55 = 20240
Step 369: 20240 + 55 = 20295
Step 370: 20295 + 55 = 20350
Step 371: 20350 + 55 = 20405
Step 372: 20405 + 55 = 20460
Step 373: 20460 + 55 = 20515
Step 374: 20515 + 55 = 20570
Step 375: 20570 + 55 = 20625
Step 376: 20625 + 55 = 20680
Step 377: 20680 + 55 = 20735
Step 378: 20735 + 55 = 20790
Step 379: 20790 + 55 = 20845
Step 380: 20845 + 55 = 20900
Step 381: 20900 + 55 = 20955
Step 382: 20955 + 55 = 21010
Step 383: 21010 + 55 = 21065
Step 384: 21065 + 55 = 21120
Step 385: 21120 + 55 = 21175
Step 386: 21175 + 55 = 21230
Step 387: 21230 + 55 = 21285
Step 388: 21285 + 55 = 21340
Step 389: 21340 + 55 = 21395
Step 390: 21395 + 55 = 21450
Step 391: 21450 + 55 = 21505
Step 392: 21505 + 55 = 21560
Step 393: 21560 + 55 = 21615
Step 394: 21615 + 55 = 21670
Step 395: 21670 + 55 = 21725
Step 396: 21725 + 55 = 21780
Step 397: 21780 + 55 = 21835
Step 398: 21835 + 55 = 21890
Step 399: 21890 + 55 = 21945
Step 400: 21945 + 55 = 22000
Step 401: 22000 + 55 = 22055
Step 402: 22055 + 55 = 22110
Step 403: 22110 + 55 = 22165
Step 404: 22165 + 55 = 22220
Step 405: 22220 + 55 = 22275
Step 406: 22275 + 55 = 22330
Step 407: 22330 + 55 = 22385
Step 408: 22385 + 55 = 22440
Step 409: 22440 + 55 = 22495
Step 410: 22495 + 55 = 22550
Step 411: 22550 + 55 = 22605
Step 412: 22605 + 55 = 22660
Step 413: 22660 + 55 = 22715
Step 414: 22715 + 55 = 22770
Step 415: 22770 + 55 = 22825
Step 416: 22825 + 55 = 22880
Step 417: 22880 + 55 = 22935
Step 418: 22935 + 55 = 22990
Step 419: 22990 + 55 = 23045
Step 420: 23045 + 55 = 23100
Step 421: 23100 + 55 = 23155
Step 422: 23155 + 55 = 23210
Step 423: 23210 + 55 = 23265
Step 424: 23265 + 55 = 23320
Step 425: 23320 + 55 = 23375
Step 426: 23375 + 55 = 23430
Step 427: 23430 + 55 = 23485
Step 428: 23485 + 55 = 23540
Step 429: 23540 + 55 = 23595
Step 430: 23595 + 55 = 23650
Step 431: 23650 + 55 = 23705
Step 432: 23705 + 55 = 23760
Step 433: 23760 + 55 = 23815
Step 434: 23815 + 55 = 23870
Step 435: 23870 + 55 = 23925
Step 436: 23925 + 55 = 23980
Step 437: 23980 + 55 = 24035
Step 438: 24035 + 55 = 24090
Step 439: 24090 + 55 = 24145
Step 440: 24145 + 55 = 24200
Step 441: 24200 + 55 = 24255
Step 442: 24255 + 55 = 24310
Step 443: 24310 + 55 = 24365
Step 444: 24365 + 55 = 24420
Step 445: 24420 + 55 = 24475
Step 446: 24475 + 55 = 24530
Step 447: 24530 + 55 = 24585
Step 448: 24585 + 55 = 24640
Step 449: 24640 + 55 = 24695
Step 450: 24695 + 55 = 24750
Step 451: 24750 + 55 = 24805
Step 452: 24805 + 55 = 24860
Step 453: 24860 + 55 = 24915
Step 454: 24915 + 55 = 24970
Step 455: 24970 + 55 = 25025

So, 55*455 = 25025