OK, let's crack this. We're given 723 and our task is to multiply it by 71. Essentially, we'll be adding 723 to itself 71 times.
Step 1: 0 + 723 = 723
Step 2: 723 + 723 = 1446
Step 3: 1446 + 723 = 2169
Step 4: 2169 + 723 = 2892
Step 5: 2892 + 723 = 3615
Step 6: 3615 + 723 = 4338
Step 7: 4338 + 723 = 5061
Step 8: 5061 + 723 = 5784
Step 9: 5784 + 723 = 6507
Step 10: 6507 + 723 = 7230
Step 11: 7230 + 723 = 7953
Step 12: 7953 + 723 = 8676
Step 13: 8676 + 723 = 9399
Step 14: 9399 + 723 = 10122
Step 15: 10122 + 723 = 10845
Step 16: 10845 + 723 = 11568
Step 17: 11568 + 723 = 12291
Step 18: 12291 + 723 = 13014
Step 19: 13014 + 723 = 13737
Step 20: 13737 + 723 = 14460
Step 21: 14460 + 723 = 15183
Step 22: 15183 + 723 = 15906
Step 23: 15906 + 723 = 16629
Step 24: 16629 + 723 = 17352
Step 25: 17352 + 723 = 18075
Step 26: 18075 + 723 = 18798
Step 27: 18798 + 723 = 19521
Step 28: 19521 + 723 = 20244
Step 29: 20244 + 723 = 20967
Step 30: 20967 + 723 = 21690
Step 31: 21690 + 723 = 22413
Step 32: 22413 + 723 = 23136
Step 33: 23136 + 723 = 23859
Step 34: 23859 + 723 = 24582
Step 35: 24582 + 723 = 25305
Step 36: 25305 + 723 = 26028
Step 37: 26028 + 723 = 26751
Step 38: 26751 + 723 = 27474
Step 39: 27474 + 723 = 28197
Step 40: 28197 + 723 = 28920
Step 41: 28920 + 723 = 29643
Step 42: 29643 + 723 = 30366
Step 43: 30366 + 723 = 31089
Step 44: 31089 + 723 = 31812
Step 45: 31812 + 723 = 32535
Step 46: 32535 + 723 = 33258
Step 47: 33258 + 723 = 33981
Step 48: 33981 + 723 = 34704
Step 49: 34704 + 723 = 35427
Step 50: 35427 + 723 = 36150
Step 51: 36150 + 723 = 36873
Step 52: 36873 + 723 = 37596
Step 53: 37596 + 723 = 38319
Step 54: 38319 + 723 = 39042
Step 55: 39042 + 723 = 39765
Step 56: 39765 + 723 = 40488
Step 57: 40488 + 723 = 41211
Step 58: 41211 + 723 = 41934
Step 59: 41934 + 723 = 42657
Step 60: 42657 + 723 = 43380
Step 61: 43380 + 723 = 44103
Step 62: 44103 + 723 = 44826
Step 63: 44826 + 723 = 45549
Step 64: 45549 + 723 = 46272
Step 65: 46272 + 723 = 46995
Step 66: 46995 + 723 = 47718
Step 67: 47718 + 723 = 48441
Step 68: 48441 + 723 = 49164
Step 69: 49164 + 723 = 49887
Step 70: 49887 + 723 = 50610
Step 71: 50610 + 723 = 51333

So, 723*71 = 51333