Let's get this math done. We have 923 and we're going to multiply it by 72. This is the same as taking 923 and adding it to itself 72 times.
Step 1: 0 + 923 = 923
Step 2: 923 + 923 = 1846
Step 3: 1846 + 923 = 2769
Step 4: 2769 + 923 = 3692
Step 5: 3692 + 923 = 4615
Step 6: 4615 + 923 = 5538
Step 7: 5538 + 923 = 6461
Step 8: 6461 + 923 = 7384
Step 9: 7384 + 923 = 8307
Step 10: 8307 + 923 = 9230
Step 11: 9230 + 923 = 10153
Step 12: 10153 + 923 = 11076
Step 13: 11076 + 923 = 11999
Step 14: 11999 + 923 = 12922
Step 15: 12922 + 923 = 13845
Step 16: 13845 + 923 = 14768
Step 17: 14768 + 923 = 15691
Step 18: 15691 + 923 = 16614
Step 19: 16614 + 923 = 17537
Step 20: 17537 + 923 = 18460
Step 21: 18460 + 923 = 19383
Step 22: 19383 + 923 = 20306
Step 23: 20306 + 923 = 21229
Step 24: 21229 + 923 = 22152
Step 25: 22152 + 923 = 23075
Step 26: 23075 + 923 = 23998
Step 27: 23998 + 923 = 24921
Step 28: 24921 + 923 = 25844
Step 29: 25844 + 923 = 26767
Step 30: 26767 + 923 = 27690
Step 31: 27690 + 923 = 28613
Step 32: 28613 + 923 = 29536
Step 33: 29536 + 923 = 30459
Step 34: 30459 + 923 = 31382
Step 35: 31382 + 923 = 32305
Step 36: 32305 + 923 = 33228
Step 37: 33228 + 923 = 34151
Step 38: 34151 + 923 = 35074
Step 39: 35074 + 923 = 35997
Step 40: 35997 + 923 = 36920
Step 41: 36920 + 923 = 37843
Step 42: 37843 + 923 = 38766
Step 43: 38766 + 923 = 39689
Step 44: 39689 + 923 = 40612
Step 45: 40612 + 923 = 41535
Step 46: 41535 + 923 = 42458
Step 47: 42458 + 923 = 43381
Step 48: 43381 + 923 = 44304
Step 49: 44304 + 923 = 45227
Step 50: 45227 + 923 = 46150
Step 51: 46150 + 923 = 47073
Step 52: 47073 + 923 = 47996
Step 53: 47996 + 923 = 48919
Step 54: 48919 + 923 = 49842
Step 55: 49842 + 923 = 50765
Step 56: 50765 + 923 = 51688
Step 57: 51688 + 923 = 52611
Step 58: 52611 + 923 = 53534
Step 59: 53534 + 923 = 54457
Step 60: 54457 + 923 = 55380
Step 61: 55380 + 923 = 56303
Step 62: 56303 + 923 = 57226
Step 63: 57226 + 923 = 58149
Step 64: 58149 + 923 = 59072
Step 65: 59072 + 923 = 59995
Step 66: 59995 + 923 = 60918
Step 67: 60918 + 923 = 61841
Step 68: 61841 + 923 = 62764
Step 69: 62764 + 923 = 63687
Step 70: 63687 + 923 = 64610
Step 71: 64610 + 923 = 65533
Step 72: 65533 + 923 = 66456

So, 923*72 = 66456