OK, let's work through this together. We're starting with 787 and we're going to multiply it by 79, which means we add 787 to itself 79 times.
Step 1: 0 + 787 = 787
Step 2: 787 + 787 = 1574
Step 3: 1574 + 787 = 2361
Step 4: 2361 + 787 = 3148
Step 5: 3148 + 787 = 3935
Step 6: 3935 + 787 = 4722
Step 7: 4722 + 787 = 5509
Step 8: 5509 + 787 = 6296
Step 9: 6296 + 787 = 7083
Step 10: 7083 + 787 = 7870
Step 11: 7870 + 787 = 8657
Step 12: 8657 + 787 = 9444
Step 13: 9444 + 787 = 10231
Step 14: 10231 + 787 = 11018
Step 15: 11018 + 787 = 11805
Step 16: 11805 + 787 = 12592
Step 17: 12592 + 787 = 13379
Step 18: 13379 + 787 = 14166
Step 19: 14166 + 787 = 14953
Step 20: 14953 + 787 = 15740
Step 21: 15740 + 787 = 16527
Step 22: 16527 + 787 = 17314
Step 23: 17314 + 787 = 18101
Step 24: 18101 + 787 = 18888
Step 25: 18888 + 787 = 19675
Step 26: 19675 + 787 = 20462
Step 27: 20462 + 787 = 21249
Step 28: 21249 + 787 = 22036
Step 29: 22036 + 787 = 22823
Step 30: 22823 + 787 = 23610
Step 31: 23610 + 787 = 24397
Step 32: 24397 + 787 = 25184
Step 33: 25184 + 787 = 25971
Step 34: 25971 + 787 = 26758
Step 35: 26758 + 787 = 27545
Step 36: 27545 + 787 = 28332
Step 37: 28332 + 787 = 29119
Step 38: 29119 + 787 = 29906
Step 39: 29906 + 787 = 30693
Step 40: 30693 + 787 = 31480
Step 41: 31480 + 787 = 32267
Step 42: 32267 + 787 = 33054
Step 43: 33054 + 787 = 33841
Step 44: 33841 + 787 = 34628
Step 45: 34628 + 787 = 35415
Step 46: 35415 + 787 = 36202
Step 47: 36202 + 787 = 36989
Step 48: 36989 + 787 = 37776
Step 49: 37776 + 787 = 38563
Step 50: 38563 + 787 = 39350
Step 51: 39350 + 787 = 40137
Step 52: 40137 + 787 = 40924
Step 53: 40924 + 787 = 41711
Step 54: 41711 + 787 = 42498
Step 55: 42498 + 787 = 43285
Step 56: 43285 + 787 = 44072
Step 57: 44072 + 787 = 44859
Step 58: 44859 + 787 = 45646
Step 59: 45646 + 787 = 46433
Step 60: 46433 + 787 = 47220
Step 61: 47220 + 787 = 48007
Step 62: 48007 + 787 = 48794
Step 63: 48794 + 787 = 49581
Step 64: 49581 + 787 = 50368
Step 65: 50368 + 787 = 51155
Step 66: 51155 + 787 = 51942
Step 67: 51942 + 787 = 52729
Step 68: 52729 + 787 = 53516
Step 69: 53516 + 787 = 54303
Step 70: 54303 + 787 = 55090
Step 71: 55090 + 787 = 55877
Step 72: 55877 + 787 = 56664
Step 73: 56664 + 787 = 57451
Step 74: 57451 + 787 = 58238
Step 75: 58238 + 787 = 59025
Step 76: 59025 + 787 = 59812
Step 77: 59812 + 787 = 60599
Step 78: 60599 + 787 = 61386
Step 79: 61386 + 787 = 62173

So, 787*79 = 62173