Let's roll up our sleeves and solve this. We have 772 and we're going to multiply it by 72, essentially adding 772 to itself 72 times.
Step 1: 0 + 772 = 772
Step 2: 772 + 772 = 1544
Step 3: 1544 + 772 = 2316
Step 4: 2316 + 772 = 3088
Step 5: 3088 + 772 = 3860
Step 6: 3860 + 772 = 4632
Step 7: 4632 + 772 = 5404
Step 8: 5404 + 772 = 6176
Step 9: 6176 + 772 = 6948
Step 10: 6948 + 772 = 7720
Step 11: 7720 + 772 = 8492
Step 12: 8492 + 772 = 9264
Step 13: 9264 + 772 = 10036
Step 14: 10036 + 772 = 10808
Step 15: 10808 + 772 = 11580
Step 16: 11580 + 772 = 12352
Step 17: 12352 + 772 = 13124
Step 18: 13124 + 772 = 13896
Step 19: 13896 + 772 = 14668
Step 20: 14668 + 772 = 15440
Step 21: 15440 + 772 = 16212
Step 22: 16212 + 772 = 16984
Step 23: 16984 + 772 = 17756
Step 24: 17756 + 772 = 18528
Step 25: 18528 + 772 = 19300
Step 26: 19300 + 772 = 20072
Step 27: 20072 + 772 = 20844
Step 28: 20844 + 772 = 21616
Step 29: 21616 + 772 = 22388
Step 30: 22388 + 772 = 23160
Step 31: 23160 + 772 = 23932
Step 32: 23932 + 772 = 24704
Step 33: 24704 + 772 = 25476
Step 34: 25476 + 772 = 26248
Step 35: 26248 + 772 = 27020
Step 36: 27020 + 772 = 27792
Step 37: 27792 + 772 = 28564
Step 38: 28564 + 772 = 29336
Step 39: 29336 + 772 = 30108
Step 40: 30108 + 772 = 30880
Step 41: 30880 + 772 = 31652
Step 42: 31652 + 772 = 32424
Step 43: 32424 + 772 = 33196
Step 44: 33196 + 772 = 33968
Step 45: 33968 + 772 = 34740
Step 46: 34740 + 772 = 35512
Step 47: 35512 + 772 = 36284
Step 48: 36284 + 772 = 37056
Step 49: 37056 + 772 = 37828
Step 50: 37828 + 772 = 38600
Step 51: 38600 + 772 = 39372
Step 52: 39372 + 772 = 40144
Step 53: 40144 + 772 = 40916
Step 54: 40916 + 772 = 41688
Step 55: 41688 + 772 = 42460
Step 56: 42460 + 772 = 43232
Step 57: 43232 + 772 = 44004
Step 58: 44004 + 772 = 44776
Step 59: 44776 + 772 = 45548
Step 60: 45548 + 772 = 46320
Step 61: 46320 + 772 = 47092
Step 62: 47092 + 772 = 47864
Step 63: 47864 + 772 = 48636
Step 64: 48636 + 772 = 49408
Step 65: 49408 + 772 = 50180
Step 66: 50180 + 772 = 50952
Step 67: 50952 + 772 = 51724
Step 68: 51724 + 772 = 52496
Step 69: 52496 + 772 = 53268
Step 70: 53268 + 772 = 54040
Step 71: 54040 + 772 = 54812
Step 72: 54812 + 772 = 55584

So, 772*72 = 55584