Let's get this math done. We have 723 and we're going to multiply it by 27. This is the same as taking 723 and adding it to itself 27 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

So, 723*27 = 19521