OK, let's work through this together. We're starting with 844 and we're going to multiply it by 77, which means we add 844 to itself 77 times.
Step 1: 0 + 844 = 844
Step 2: 844 + 844 = 1688
Step 3: 1688 + 844 = 2532
Step 4: 2532 + 844 = 3376
Step 5: 3376 + 844 = 4220
Step 6: 4220 + 844 = 5064
Step 7: 5064 + 844 = 5908
Step 8: 5908 + 844 = 6752
Step 9: 6752 + 844 = 7596
Step 10: 7596 + 844 = 8440
Step 11: 8440 + 844 = 9284
Step 12: 9284 + 844 = 10128
Step 13: 10128 + 844 = 10972
Step 14: 10972 + 844 = 11816
Step 15: 11816 + 844 = 12660
Step 16: 12660 + 844 = 13504
Step 17: 13504 + 844 = 14348
Step 18: 14348 + 844 = 15192
Step 19: 15192 + 844 = 16036
Step 20: 16036 + 844 = 16880
Step 21: 16880 + 844 = 17724
Step 22: 17724 + 844 = 18568
Step 23: 18568 + 844 = 19412
Step 24: 19412 + 844 = 20256
Step 25: 20256 + 844 = 21100
Step 26: 21100 + 844 = 21944
Step 27: 21944 + 844 = 22788
Step 28: 22788 + 844 = 23632
Step 29: 23632 + 844 = 24476
Step 30: 24476 + 844 = 25320
Step 31: 25320 + 844 = 26164
Step 32: 26164 + 844 = 27008
Step 33: 27008 + 844 = 27852
Step 34: 27852 + 844 = 28696
Step 35: 28696 + 844 = 29540
Step 36: 29540 + 844 = 30384
Step 37: 30384 + 844 = 31228
Step 38: 31228 + 844 = 32072
Step 39: 32072 + 844 = 32916
Step 40: 32916 + 844 = 33760
Step 41: 33760 + 844 = 34604
Step 42: 34604 + 844 = 35448
Step 43: 35448 + 844 = 36292
Step 44: 36292 + 844 = 37136
Step 45: 37136 + 844 = 37980
Step 46: 37980 + 844 = 38824
Step 47: 38824 + 844 = 39668
Step 48: 39668 + 844 = 40512
Step 49: 40512 + 844 = 41356
Step 50: 41356 + 844 = 42200
Step 51: 42200 + 844 = 43044
Step 52: 43044 + 844 = 43888
Step 53: 43888 + 844 = 44732
Step 54: 44732 + 844 = 45576
Step 55: 45576 + 844 = 46420
Step 56: 46420 + 844 = 47264
Step 57: 47264 + 844 = 48108
Step 58: 48108 + 844 = 48952
Step 59: 48952 + 844 = 49796
Step 60: 49796 + 844 = 50640
Step 61: 50640 + 844 = 51484
Step 62: 51484 + 844 = 52328
Step 63: 52328 + 844 = 53172
Step 64: 53172 + 844 = 54016
Step 65: 54016 + 844 = 54860
Step 66: 54860 + 844 = 55704
Step 67: 55704 + 844 = 56548
Step 68: 56548 + 844 = 57392
Step 69: 57392 + 844 = 58236
Step 70: 58236 + 844 = 59080
Step 71: 59080 + 844 = 59924
Step 72: 59924 + 844 = 60768
Step 73: 60768 + 844 = 61612
Step 74: 61612 + 844 = 62456
Step 75: 62456 + 844 = 63300
Step 76: 63300 + 844 = 64144
Step 77: 64144 + 844 = 64988

So, 844*77 = 64988