OK, let's crack this. We're given 709 and our task is to multiply it by 77. Essentially, we'll be adding 709 to itself 77 times.
Step 1: 0 + 709 = 709
Step 2: 709 + 709 = 1418
Step 3: 1418 + 709 = 2127
Step 4: 2127 + 709 = 2836
Step 5: 2836 + 709 = 3545
Step 6: 3545 + 709 = 4254
Step 7: 4254 + 709 = 4963
Step 8: 4963 + 709 = 5672
Step 9: 5672 + 709 = 6381
Step 10: 6381 + 709 = 7090
Step 11: 7090 + 709 = 7799
Step 12: 7799 + 709 = 8508
Step 13: 8508 + 709 = 9217
Step 14: 9217 + 709 = 9926
Step 15: 9926 + 709 = 10635
Step 16: 10635 + 709 = 11344
Step 17: 11344 + 709 = 12053
Step 18: 12053 + 709 = 12762
Step 19: 12762 + 709 = 13471
Step 20: 13471 + 709 = 14180
Step 21: 14180 + 709 = 14889
Step 22: 14889 + 709 = 15598
Step 23: 15598 + 709 = 16307
Step 24: 16307 + 709 = 17016
Step 25: 17016 + 709 = 17725
Step 26: 17725 + 709 = 18434
Step 27: 18434 + 709 = 19143
Step 28: 19143 + 709 = 19852
Step 29: 19852 + 709 = 20561
Step 30: 20561 + 709 = 21270
Step 31: 21270 + 709 = 21979
Step 32: 21979 + 709 = 22688
Step 33: 22688 + 709 = 23397
Step 34: 23397 + 709 = 24106
Step 35: 24106 + 709 = 24815
Step 36: 24815 + 709 = 25524
Step 37: 25524 + 709 = 26233
Step 38: 26233 + 709 = 26942
Step 39: 26942 + 709 = 27651
Step 40: 27651 + 709 = 28360
Step 41: 28360 + 709 = 29069
Step 42: 29069 + 709 = 29778
Step 43: 29778 + 709 = 30487
Step 44: 30487 + 709 = 31196
Step 45: 31196 + 709 = 31905
Step 46: 31905 + 709 = 32614
Step 47: 32614 + 709 = 33323
Step 48: 33323 + 709 = 34032
Step 49: 34032 + 709 = 34741
Step 50: 34741 + 709 = 35450
Step 51: 35450 + 709 = 36159
Step 52: 36159 + 709 = 36868
Step 53: 36868 + 709 = 37577
Step 54: 37577 + 709 = 38286
Step 55: 38286 + 709 = 38995
Step 56: 38995 + 709 = 39704
Step 57: 39704 + 709 = 40413
Step 58: 40413 + 709 = 41122
Step 59: 41122 + 709 = 41831
Step 60: 41831 + 709 = 42540
Step 61: 42540 + 709 = 43249
Step 62: 43249 + 709 = 43958
Step 63: 43958 + 709 = 44667
Step 64: 44667 + 709 = 45376
Step 65: 45376 + 709 = 46085
Step 66: 46085 + 709 = 46794
Step 67: 46794 + 709 = 47503
Step 68: 47503 + 709 = 48212
Step 69: 48212 + 709 = 48921
Step 70: 48921 + 709 = 49630
Step 71: 49630 + 709 = 50339
Step 72: 50339 + 709 = 51048
Step 73: 51048 + 709 = 51757
Step 74: 51757 + 709 = 52466
Step 75: 52466 + 709 = 53175
Step 76: 53175 + 709 = 53884
Step 77: 53884 + 709 = 54593

So, 709*77 = 54593