Sure thing, let's get straight to it. We start with 571 and we're going to multiply it by 243, which means adding 571 to itself 243 times.
Step 1: 0 + 571 = 571
Step 2: 571 + 571 = 1142
Step 3: 1142 + 571 = 1713
Step 4: 1713 + 571 = 2284
Step 5: 2284 + 571 = 2855
Step 6: 2855 + 571 = 3426
Step 7: 3426 + 571 = 3997
Step 8: 3997 + 571 = 4568
Step 9: 4568 + 571 = 5139
Step 10: 5139 + 571 = 5710
Step 11: 5710 + 571 = 6281
Step 12: 6281 + 571 = 6852
Step 13: 6852 + 571 = 7423
Step 14: 7423 + 571 = 7994
Step 15: 7994 + 571 = 8565
Step 16: 8565 + 571 = 9136
Step 17: 9136 + 571 = 9707
Step 18: 9707 + 571 = 10278
Step 19: 10278 + 571 = 10849
Step 20: 10849 + 571 = 11420
Step 21: 11420 + 571 = 11991
Step 22: 11991 + 571 = 12562
Step 23: 12562 + 571 = 13133
Step 24: 13133 + 571 = 13704
Step 25: 13704 + 571 = 14275
Step 26: 14275 + 571 = 14846
Step 27: 14846 + 571 = 15417
Step 28: 15417 + 571 = 15988
Step 29: 15988 + 571 = 16559
Step 30: 16559 + 571 = 17130
Step 31: 17130 + 571 = 17701
Step 32: 17701 + 571 = 18272
Step 33: 18272 + 571 = 18843
Step 34: 18843 + 571 = 19414
Step 35: 19414 + 571 = 19985
Step 36: 19985 + 571 = 20556
Step 37: 20556 + 571 = 21127
Step 38: 21127 + 571 = 21698
Step 39: 21698 + 571 = 22269
Step 40: 22269 + 571 = 22840
Step 41: 22840 + 571 = 23411
Step 42: 23411 + 571 = 23982
Step 43: 23982 + 571 = 24553
Step 44: 24553 + 571 = 25124
Step 45: 25124 + 571 = 25695
Step 46: 25695 + 571 = 26266
Step 47: 26266 + 571 = 26837
Step 48: 26837 + 571 = 27408
Step 49: 27408 + 571 = 27979
Step 50: 27979 + 571 = 28550
Step 51: 28550 + 571 = 29121
Step 52: 29121 + 571 = 29692
Step 53: 29692 + 571 = 30263
Step 54: 30263 + 571 = 30834
Step 55: 30834 + 571 = 31405
Step 56: 31405 + 571 = 31976
Step 57: 31976 + 571 = 32547
Step 58: 32547 + 571 = 33118
Step 59: 33118 + 571 = 33689
Step 60: 33689 + 571 = 34260
Step 61: 34260 + 571 = 34831
Step 62: 34831 + 571 = 35402
Step 63: 35402 + 571 = 35973
Step 64: 35973 + 571 = 36544
Step 65: 36544 + 571 = 37115
Step 66: 37115 + 571 = 37686
Step 67: 37686 + 571 = 38257
Step 68: 38257 + 571 = 38828
Step 69: 38828 + 571 = 39399
Step 70: 39399 + 571 = 39970
Step 71: 39970 + 571 = 40541
Step 72: 40541 + 571 = 41112
Step 73: 41112 + 571 = 41683
Step 74: 41683 + 571 = 42254
Step 75: 42254 + 571 = 42825
Step 76: 42825 + 571 = 43396
Step 77: 43396 + 571 = 43967
Step 78: 43967 + 571 = 44538
Step 79: 44538 + 571 = 45109
Step 80: 45109 + 571 = 45680
Step 81: 45680 + 571 = 46251
Step 82: 46251 + 571 = 46822
Step 83: 46822 + 571 = 47393
Step 84: 47393 + 571 = 47964
Step 85: 47964 + 571 = 48535
Step 86: 48535 + 571 = 49106
Step 87: 49106 + 571 = 49677
Step 88: 49677 + 571 = 50248
Step 89: 50248 + 571 = 50819
Step 90: 50819 + 571 = 51390
Step 91: 51390 + 571 = 51961
Step 92: 51961 + 571 = 52532
Step 93: 52532 + 571 = 53103
Step 94: 53103 + 571 = 53674
Step 95: 53674 + 571 = 54245
Step 96: 54245 + 571 = 54816
Step 97: 54816 + 571 = 55387
Step 98: 55387 + 571 = 55958
Step 99: 55958 + 571 = 56529
Step 100: 56529 + 571 = 57100
Step 101: 57100 + 571 = 57671
Step 102: 57671 + 571 = 58242
Step 103: 58242 + 571 = 58813
Step 104: 58813 + 571 = 59384
Step 105: 59384 + 571 = 59955
Step 106: 59955 + 571 = 60526
Step 107: 60526 + 571 = 61097
Step 108: 61097 + 571 = 61668
Step 109: 61668 + 571 = 62239
Step 110: 62239 + 571 = 62810
Step 111: 62810 + 571 = 63381
Step 112: 63381 + 571 = 63952
Step 113: 63952 + 571 = 64523
Step 114: 64523 + 571 = 65094
Step 115: 65094 + 571 = 65665
Step 116: 65665 + 571 = 66236
Step 117: 66236 + 571 = 66807
Step 118: 66807 + 571 = 67378
Step 119: 67378 + 571 = 67949
Step 120: 67949 + 571 = 68520
Step 121: 68520 + 571 = 69091
Step 122: 69091 + 571 = 69662
Step 123: 69662 + 571 = 70233
Step 124: 70233 + 571 = 70804
Step 125: 70804 + 571 = 71375
Step 126: 71375 + 571 = 71946
Step 127: 71946 + 571 = 72517
Step 128: 72517 + 571 = 73088
Step 129: 73088 + 571 = 73659
Step 130: 73659 + 571 = 74230
Step 131: 74230 + 571 = 74801
Step 132: 74801 + 571 = 75372
Step 133: 75372 + 571 = 75943
Step 134: 75943 + 571 = 76514
Step 135: 76514 + 571 = 77085
Step 136: 77085 + 571 = 77656
Step 137: 77656 + 571 = 78227
Step 138: 78227 + 571 = 78798
Step 139: 78798 + 571 = 79369
Step 140: 79369 + 571 = 79940
Step 141: 79940 + 571 = 80511
Step 142: 80511 + 571 = 81082
Step 143: 81082 + 571 = 81653
Step 144: 81653 + 571 = 82224
Step 145: 82224 + 571 = 82795
Step 146: 82795 + 571 = 83366
Step 147: 83366 + 571 = 83937
Step 148: 83937 + 571 = 84508
Step 149: 84508 + 571 = 85079
Step 150: 85079 + 571 = 85650
Step 151: 85650 + 571 = 86221
Step 152: 86221 + 571 = 86792
Step 153: 86792 + 571 = 87363
Step 154: 87363 + 571 = 87934
Step 155: 87934 + 571 = 88505
Step 156: 88505 + 571 = 89076
Step 157: 89076 + 571 = 89647
Step 158: 89647 + 571 = 90218
Step 159: 90218 + 571 = 90789
Step 160: 90789 + 571 = 91360
Step 161: 91360 + 571 = 91931
Step 162: 91931 + 571 = 92502
Step 163: 92502 + 571 = 93073
Step 164: 93073 + 571 = 93644
Step 165: 93644 + 571 = 94215
Step 166: 94215 + 571 = 94786
Step 167: 94786 + 571 = 95357
Step 168: 95357 + 571 = 95928
Step 169: 95928 + 571 = 96499
Step 170: 96499 + 571 = 97070
Step 171: 97070 + 571 = 97641
Step 172: 97641 + 571 = 98212
Step 173: 98212 + 571 = 98783
Step 174: 98783 + 571 = 99354
Step 175: 99354 + 571 = 99925
Step 176: 99925 + 571 = 100496
Step 177: 100496 + 571 = 101067
Step 178: 101067 + 571 = 101638
Step 179: 101638 + 571 = 102209
Step 180: 102209 + 571 = 102780
Step 181: 102780 + 571 = 103351
Step 182: 103351 + 571 = 103922
Step 183: 103922 + 571 = 104493
Step 184: 104493 + 571 = 105064
Step 185: 105064 + 571 = 105635
Step 186: 105635 + 571 = 106206
Step 187: 106206 + 571 = 106777
Step 188: 106777 + 571 = 107348
Step 189: 107348 + 571 = 107919
Step 190: 107919 + 571 = 108490
Step 191: 108490 + 571 = 109061
Step 192: 109061 + 571 = 109632
Step 193: 109632 + 571 = 110203
Step 194: 110203 + 571 = 110774
Step 195: 110774 + 571 = 111345
Step 196: 111345 + 571 = 111916
Step 197: 111916 + 571 = 112487
Step 198: 112487 + 571 = 113058
Step 199: 113058 + 571 = 113629
Step 200: 113629 + 571 = 114200
Step 201: 114200 + 571 = 114771
Step 202: 114771 + 571 = 115342
Step 203: 115342 + 571 = 115913
Step 204: 115913 + 571 = 116484
Step 205: 116484 + 571 = 117055
Step 206: 117055 + 571 = 117626
Step 207: 117626 + 571 = 118197
Step 208: 118197 + 571 = 118768
Step 209: 118768 + 571 = 119339
Step 210: 119339 + 571 = 119910
Step 211: 119910 + 571 = 120481
Step 212: 120481 + 571 = 121052
Step 213: 121052 + 571 = 121623
Step 214: 121623 + 571 = 122194
Step 215: 122194 + 571 = 122765
Step 216: 122765 + 571 = 123336
Step 217: 123336 + 571 = 123907
Step 218: 123907 + 571 = 124478
Step 219: 124478 + 571 = 125049
Step 220: 125049 + 571 = 125620
Step 221: 125620 + 571 = 126191
Step 222: 126191 + 571 = 126762
Step 223: 126762 + 571 = 127333
Step 224: 127333 + 571 = 127904
Step 225: 127904 + 571 = 128475
Step 226: 128475 + 571 = 129046
Step 227: 129046 + 571 = 129617
Step 228: 129617 + 571 = 130188
Step 229: 130188 + 571 = 130759
Step 230: 130759 + 571 = 131330
Step 231: 131330 + 571 = 131901
Step 232: 131901 + 571 = 132472
Step 233: 132472 + 571 = 133043
Step 234: 133043 + 571 = 133614
Step 235: 133614 + 571 = 134185
Step 236: 134185 + 571 = 134756
Step 237: 134756 + 571 = 135327
Step 238: 135327 + 571 = 135898
Step 239: 135898 + 571 = 136469
Step 240: 136469 + 571 = 137040
Step 241: 137040 + 571 = 137611
Step 242: 137611 + 571 = 138182
Step 243: 138182 + 571 = 138753

So, 571*243 = 138753