OK, let's work through this together. We're starting with 20 and we're going to multiply it by 453, which means we add 20 to itself 453 times.
Step 1: 0 + 20 = 20
Step 2: 20 + 20 = 40
Step 3: 40 + 20 = 60
Step 4: 60 + 20 = 80
Step 5: 80 + 20 = 100
Step 6: 100 + 20 = 120
Step 7: 120 + 20 = 140
Step 8: 140 + 20 = 160
Step 9: 160 + 20 = 180
Step 10: 180 + 20 = 200
Step 11: 200 + 20 = 220
Step 12: 220 + 20 = 240
Step 13: 240 + 20 = 260
Step 14: 260 + 20 = 280
Step 15: 280 + 20 = 300
Step 16: 300 + 20 = 320
Step 17: 320 + 20 = 340
Step 18: 340 + 20 = 360
Step 19: 360 + 20 = 380
Step 20: 380 + 20 = 400
Step 21: 400 + 20 = 420
Step 22: 420 + 20 = 440
Step 23: 440 + 20 = 460
Step 24: 460 + 20 = 480
Step 25: 480 + 20 = 500
Step 26: 500 + 20 = 520
Step 27: 520 + 20 = 540
Step 28: 540 + 20 = 560
Step 29: 560 + 20 = 580
Step 30: 580 + 20 = 600
Step 31: 600 + 20 = 620
Step 32: 620 + 20 = 640
Step 33: 640 + 20 = 660
Step 34: 660 + 20 = 680
Step 35: 680 + 20 = 700
Step 36: 700 + 20 = 720
Step 37: 720 + 20 = 740
Step 38: 740 + 20 = 760
Step 39: 760 + 20 = 780
Step 40: 780 + 20 = 800
Step 41: 800 + 20 = 820
Step 42: 820 + 20 = 840
Step 43: 840 + 20 = 860
Step 44: 860 + 20 = 880
Step 45: 880 + 20 = 900
Step 46: 900 + 20 = 920
Step 47: 920 + 20 = 940
Step 48: 940 + 20 = 960
Step 49: 960 + 20 = 980
Step 50: 980 + 20 = 1000
Step 51: 1000 + 20 = 1020
Step 52: 1020 + 20 = 1040
Step 53: 1040 + 20 = 1060
Step 54: 1060 + 20 = 1080
Step 55: 1080 + 20 = 1100
Step 56: 1100 + 20 = 1120
Step 57: 1120 + 20 = 1140
Step 58: 1140 + 20 = 1160
Step 59: 1160 + 20 = 1180
Step 60: 1180 + 20 = 1200
Step 61: 1200 + 20 = 1220
Step 62: 1220 + 20 = 1240
Step 63: 1240 + 20 = 1260
Step 64: 1260 + 20 = 1280
Step 65: 1280 + 20 = 1300
Step 66: 1300 + 20 = 1320
Step 67: 1320 + 20 = 1340
Step 68: 1340 + 20 = 1360
Step 69: 1360 + 20 = 1380
Step 70: 1380 + 20 = 1400
Step 71: 1400 + 20 = 1420
Step 72: 1420 + 20 = 1440
Step 73: 1440 + 20 = 1460
Step 74: 1460 + 20 = 1480
Step 75: 1480 + 20 = 1500
Step 76: 1500 + 20 = 1520
Step 77: 1520 + 20 = 1540
Step 78: 1540 + 20 = 1560
Step 79: 1560 + 20 = 1580
Step 80: 1580 + 20 = 1600
Step 81: 1600 + 20 = 1620
Step 82: 1620 + 20 = 1640
Step 83: 1640 + 20 = 1660
Step 84: 1660 + 20 = 1680
Step 85: 1680 + 20 = 1700
Step 86: 1700 + 20 = 1720
Step 87: 1720 + 20 = 1740
Step 88: 1740 + 20 = 1760
Step 89: 1760 + 20 = 1780
Step 90: 1780 + 20 = 1800
Step 91: 1800 + 20 = 1820
Step 92: 1820 + 20 = 1840
Step 93: 1840 + 20 = 1860
Step 94: 1860 + 20 = 1880
Step 95: 1880 + 20 = 1900
Step 96: 1900 + 20 = 1920
Step 97: 1920 + 20 = 1940
Step 98: 1940 + 20 = 1960
Step 99: 1960 + 20 = 1980
Step 100: 1980 + 20 = 2000
Step 101: 2000 + 20 = 2020
Step 102: 2020 + 20 = 2040
Step 103: 2040 + 20 = 2060
Step 104: 2060 + 20 = 2080
Step 105: 2080 + 20 = 2100
Step 106: 2100 + 20 = 2120
Step 107: 2120 + 20 = 2140
Step 108: 2140 + 20 = 2160
Step 109: 2160 + 20 = 2180
Step 110: 2180 + 20 = 2200
Step 111: 2200 + 20 = 2220
Step 112: 2220 + 20 = 2240
Step 113: 2240 + 20 = 2260
Step 114: 2260 + 20 = 2280
Step 115: 2280 + 20 = 2300
Step 116: 2300 + 20 = 2320
Step 117: 2320 + 20 = 2340
Step 118: 2340 + 20 = 2360
Step 119: 2360 + 20 = 2380
Step 120: 2380 + 20 = 2400
Step 121: 2400 + 20 = 2420
Step 122: 2420 + 20 = 2440
Step 123: 2440 + 20 = 2460
Step 124: 2460 + 20 = 2480
Step 125: 2480 + 20 = 2500
Step 126: 2500 + 20 = 2520
Step 127: 2520 + 20 = 2540
Step 128: 2540 + 20 = 2560
Step 129: 2560 + 20 = 2580
Step 130: 2580 + 20 = 2600
Step 131: 2600 + 20 = 2620
Step 132: 2620 + 20 = 2640
Step 133: 2640 + 20 = 2660
Step 134: 2660 + 20 = 2680
Step 135: 2680 + 20 = 2700
Step 136: 2700 + 20 = 2720
Step 137: 2720 + 20 = 2740
Step 138: 2740 + 20 = 2760
Step 139: 2760 + 20 = 2780
Step 140: 2780 + 20 = 2800
Step 141: 2800 + 20 = 2820
Step 142: 2820 + 20 = 2840
Step 143: 2840 + 20 = 2860
Step 144: 2860 + 20 = 2880
Step 145: 2880 + 20 = 2900
Step 146: 2900 + 20 = 2920
Step 147: 2920 + 20 = 2940
Step 148: 2940 + 20 = 2960
Step 149: 2960 + 20 = 2980
Step 150: 2980 + 20 = 3000
Step 151: 3000 + 20 = 3020
Step 152: 3020 + 20 = 3040
Step 153: 3040 + 20 = 3060
Step 154: 3060 + 20 = 3080
Step 155: 3080 + 20 = 3100
Step 156: 3100 + 20 = 3120
Step 157: 3120 + 20 = 3140
Step 158: 3140 + 20 = 3160
Step 159: 3160 + 20 = 3180
Step 160: 3180 + 20 = 3200
Step 161: 3200 + 20 = 3220
Step 162: 3220 + 20 = 3240
Step 163: 3240 + 20 = 3260
Step 164: 3260 + 20 = 3280
Step 165: 3280 + 20 = 3300
Step 166: 3300 + 20 = 3320
Step 167: 3320 + 20 = 3340
Step 168: 3340 + 20 = 3360
Step 169: 3360 + 20 = 3380
Step 170: 3380 + 20 = 3400
Step 171: 3400 + 20 = 3420
Step 172: 3420 + 20 = 3440
Step 173: 3440 + 20 = 3460
Step 174: 3460 + 20 = 3480
Step 175: 3480 + 20 = 3500
Step 176: 3500 + 20 = 3520
Step 177: 3520 + 20 = 3540
Step 178: 3540 + 20 = 3560
Step 179: 3560 + 20 = 3580
Step 180: 3580 + 20 = 3600
Step 181: 3600 + 20 = 3620
Step 182: 3620 + 20 = 3640
Step 183: 3640 + 20 = 3660
Step 184: 3660 + 20 = 3680
Step 185: 3680 + 20 = 3700
Step 186: 3700 + 20 = 3720
Step 187: 3720 + 20 = 3740
Step 188: 3740 + 20 = 3760
Step 189: 3760 + 20 = 3780
Step 190: 3780 + 20 = 3800
Step 191: 3800 + 20 = 3820
Step 192: 3820 + 20 = 3840
Step 193: 3840 + 20 = 3860
Step 194: 3860 + 20 = 3880
Step 195: 3880 + 20 = 3900
Step 196: 3900 + 20 = 3920
Step 197: 3920 + 20 = 3940
Step 198: 3940 + 20 = 3960
Step 199: 3960 + 20 = 3980
Step 200: 3980 + 20 = 4000
Step 201: 4000 + 20 = 4020
Step 202: 4020 + 20 = 4040
Step 203: 4040 + 20 = 4060
Step 204: 4060 + 20 = 4080
Step 205: 4080 + 20 = 4100
Step 206: 4100 + 20 = 4120
Step 207: 4120 + 20 = 4140
Step 208: 4140 + 20 = 4160
Step 209: 4160 + 20 = 4180
Step 210: 4180 + 20 = 4200
Step 211: 4200 + 20 = 4220
Step 212: 4220 + 20 = 4240
Step 213: 4240 + 20 = 4260
Step 214: 4260 + 20 = 4280
Step 215: 4280 + 20 = 4300
Step 216: 4300 + 20 = 4320
Step 217: 4320 + 20 = 4340
Step 218: 4340 + 20 = 4360
Step 219: 4360 + 20 = 4380
Step 220: 4380 + 20 = 4400
Step 221: 4400 + 20 = 4420
Step 222: 4420 + 20 = 4440
Step 223: 4440 + 20 = 4460
Step 224: 4460 + 20 = 4480
Step 225: 4480 + 20 = 4500
Step 226: 4500 + 20 = 4520
Step 227: 4520 + 20 = 4540
Step 228: 4540 + 20 = 4560
Step 229: 4560 + 20 = 4580
Step 230: 4580 + 20 = 4600
Step 231: 4600 + 20 = 4620
Step 232: 4620 + 20 = 4640
Step 233: 4640 + 20 = 4660
Step 234: 4660 + 20 = 4680
Step 235: 4680 + 20 = 4700
Step 236: 4700 + 20 = 4720
Step 237: 4720 + 20 = 4740
Step 238: 4740 + 20 = 4760
Step 239: 4760 + 20 = 4780
Step 240: 4780 + 20 = 4800
Step 241: 4800 + 20 = 4820
Step 242: 4820 + 20 = 4840
Step 243: 4840 + 20 = 4860
Step 244: 4860 + 20 = 4880
Step 245: 4880 + 20 = 4900
Step 246: 4900 + 20 = 4920
Step 247: 4920 + 20 = 4940
Step 248: 4940 + 20 = 4960
Step 249: 4960 + 20 = 4980
Step 250: 4980 + 20 = 5000
Step 251: 5000 + 20 = 5020
Step 252: 5020 + 20 = 5040
Step 253: 5040 + 20 = 5060
Step 254: 5060 + 20 = 5080
Step 255: 5080 + 20 = 5100
Step 256: 5100 + 20 = 5120
Step 257: 5120 + 20 = 5140
Step 258: 5140 + 20 = 5160
Step 259: 5160 + 20 = 5180
Step 260: 5180 + 20 = 5200
Step 261: 5200 + 20 = 5220
Step 262: 5220 + 20 = 5240
Step 263: 5240 + 20 = 5260
Step 264: 5260 + 20 = 5280
Step 265: 5280 + 20 = 5300
Step 266: 5300 + 20 = 5320
Step 267: 5320 + 20 = 5340
Step 268: 5340 + 20 = 5360
Step 269: 5360 + 20 = 5380
Step 270: 5380 + 20 = 5400
Step 271: 5400 + 20 = 5420
Step 272: 5420 + 20 = 5440
Step 273: 5440 + 20 = 5460
Step 274: 5460 + 20 = 5480
Step 275: 5480 + 20 = 5500
Step 276: 5500 + 20 = 5520
Step 277: 5520 + 20 = 5540
Step 278: 5540 + 20 = 5560
Step 279: 5560 + 20 = 5580
Step 280: 5580 + 20 = 5600
Step 281: 5600 + 20 = 5620
Step 282: 5620 + 20 = 5640
Step 283: 5640 + 20 = 5660
Step 284: 5660 + 20 = 5680
Step 285: 5680 + 20 = 5700
Step 286: 5700 + 20 = 5720
Step 287: 5720 + 20 = 5740
Step 288: 5740 + 20 = 5760
Step 289: 5760 + 20 = 5780
Step 290: 5780 + 20 = 5800
Step 291: 5800 + 20 = 5820
Step 292: 5820 + 20 = 5840
Step 293: 5840 + 20 = 5860
Step 294: 5860 + 20 = 5880
Step 295: 5880 + 20 = 5900
Step 296: 5900 + 20 = 5920
Step 297: 5920 + 20 = 5940
Step 298: 5940 + 20 = 5960
Step 299: 5960 + 20 = 5980
Step 300: 5980 + 20 = 6000
Step 301: 6000 + 20 = 6020
Step 302: 6020 + 20 = 6040
Step 303: 6040 + 20 = 6060
Step 304: 6060 + 20 = 6080
Step 305: 6080 + 20 = 6100
Step 306: 6100 + 20 = 6120
Step 307: 6120 + 20 = 6140
Step 308: 6140 + 20 = 6160
Step 309: 6160 + 20 = 6180
Step 310: 6180 + 20 = 6200
Step 311: 6200 + 20 = 6220
Step 312: 6220 + 20 = 6240
Step 313: 6240 + 20 = 6260
Step 314: 6260 + 20 = 6280
Step 315: 6280 + 20 = 6300
Step 316: 6300 + 20 = 6320
Step 317: 6320 + 20 = 6340
Step 318: 6340 + 20 = 6360
Step 319: 6360 + 20 = 6380
Step 320: 6380 + 20 = 6400
Step 321: 6400 + 20 = 6420
Step 322: 6420 + 20 = 6440
Step 323: 6440 + 20 = 6460
Step 324: 6460 + 20 = 6480
Step 325: 6480 + 20 = 6500
Step 326: 6500 + 20 = 6520
Step 327: 6520 + 20 = 6540
Step 328: 6540 + 20 = 6560
Step 329: 6560 + 20 = 6580
Step 330: 6580 + 20 = 6600
Step 331: 6600 + 20 = 6620
Step 332: 6620 + 20 = 6640
Step 333: 6640 + 20 = 6660
Step 334: 6660 + 20 = 6680
Step 335: 6680 + 20 = 6700
Step 336: 6700 + 20 = 6720
Step 337: 6720 + 20 = 6740
Step 338: 6740 + 20 = 6760
Step 339: 6760 + 20 = 6780
Step 340: 6780 + 20 = 6800
Step 341: 6800 + 20 = 6820
Step 342: 6820 + 20 = 6840
Step 343: 6840 + 20 = 6860
Step 344: 6860 + 20 = 6880
Step 345: 6880 + 20 = 6900
Step 346: 6900 + 20 = 6920
Step 347: 6920 + 20 = 6940
Step 348: 6940 + 20 = 6960
Step 349: 6960 + 20 = 6980
Step 350: 6980 + 20 = 7000
Step 351: 7000 + 20 = 7020
Step 352: 7020 + 20 = 7040
Step 353: 7040 + 20 = 7060
Step 354: 7060 + 20 = 7080
Step 355: 7080 + 20 = 7100
Step 356: 7100 + 20 = 7120
Step 357: 7120 + 20 = 7140
Step 358: 7140 + 20 = 7160
Step 359: 7160 + 20 = 7180
Step 360: 7180 + 20 = 7200
Step 361: 7200 + 20 = 7220
Step 362: 7220 + 20 = 7240
Step 363: 7240 + 20 = 7260
Step 364: 7260 + 20 = 7280
Step 365: 7280 + 20 = 7300
Step 366: 7300 + 20 = 7320
Step 367: 7320 + 20 = 7340
Step 368: 7340 + 20 = 7360
Step 369: 7360 + 20 = 7380
Step 370: 7380 + 20 = 7400
Step 371: 7400 + 20 = 7420
Step 372: 7420 + 20 = 7440
Step 373: 7440 + 20 = 7460
Step 374: 7460 + 20 = 7480
Step 375: 7480 + 20 = 7500
Step 376: 7500 + 20 = 7520
Step 377: 7520 + 20 = 7540
Step 378: 7540 + 20 = 7560
Step 379: 7560 + 20 = 7580
Step 380: 7580 + 20 = 7600
Step 381: 7600 + 20 = 7620
Step 382: 7620 + 20 = 7640
Step 383: 7640 + 20 = 7660
Step 384: 7660 + 20 = 7680
Step 385: 7680 + 20 = 7700
Step 386: 7700 + 20 = 7720
Step 387: 7720 + 20 = 7740
Step 388: 7740 + 20 = 7760
Step 389: 7760 + 20 = 7780
Step 390: 7780 + 20 = 7800
Step 391: 7800 + 20 = 7820
Step 392: 7820 + 20 = 7840
Step 393: 7840 + 20 = 7860
Step 394: 7860 + 20 = 7880
Step 395: 7880 + 20 = 7900
Step 396: 7900 + 20 = 7920
Step 397: 7920 + 20 = 7940
Step 398: 7940 + 20 = 7960
Step 399: 7960 + 20 = 7980
Step 400: 7980 + 20 = 8000
Step 401: 8000 + 20 = 8020
Step 402: 8020 + 20 = 8040
Step 403: 8040 + 20 = 8060
Step 404: 8060 + 20 = 8080
Step 405: 8080 + 20 = 8100
Step 406: 8100 + 20 = 8120
Step 407: 8120 + 20 = 8140
Step 408: 8140 + 20 = 8160
Step 409: 8160 + 20 = 8180
Step 410: 8180 + 20 = 8200
Step 411: 8200 + 20 = 8220
Step 412: 8220 + 20 = 8240
Step 413: 8240 + 20 = 8260
Step 414: 8260 + 20 = 8280
Step 415: 8280 + 20 = 8300
Step 416: 8300 + 20 = 8320
Step 417: 8320 + 20 = 8340
Step 418: 8340 + 20 = 8360
Step 419: 8360 + 20 = 8380
Step 420: 8380 + 20 = 8400
Step 421: 8400 + 20 = 8420
Step 422: 8420 + 20 = 8440
Step 423: 8440 + 20 = 8460
Step 424: 8460 + 20 = 8480
Step 425: 8480 + 20 = 8500
Step 426: 8500 + 20 = 8520
Step 427: 8520 + 20 = 8540
Step 428: 8540 + 20 = 8560
Step 429: 8560 + 20 = 8580
Step 430: 8580 + 20 = 8600
Step 431: 8600 + 20 = 8620
Step 432: 8620 + 20 = 8640
Step 433: 8640 + 20 = 8660
Step 434: 8660 + 20 = 8680
Step 435: 8680 + 20 = 8700
Step 436: 8700 + 20 = 8720
Step 437: 8720 + 20 = 8740
Step 438: 8740 + 20 = 8760
Step 439: 8760 + 20 = 8780
Step 440: 8780 + 20 = 8800
Step 441: 8800 + 20 = 8820
Step 442: 8820 + 20 = 8840
Step 443: 8840 + 20 = 8860
Step 444: 8860 + 20 = 8880
Step 445: 8880 + 20 = 8900
Step 446: 8900 + 20 = 8920
Step 447: 8920 + 20 = 8940
Step 448: 8940 + 20 = 8960
Step 449: 8960 + 20 = 8980
Step 450: 8980 + 20 = 9000
Step 451: 9000 + 20 = 9020
Step 452: 9020 + 20 = 9040
Step 453: 9040 + 20 = 9060

So, 20*453 = 9060