OK, let's work through this together. We're starting with 77 and we're going to multiply it by 84, which means we add 77 to itself 84 times.
Step 1: 0 + 77 = 77
Step 2: 77 + 77 = 154
Step 3: 154 + 77 = 231
Step 4: 231 + 77 = 308
Step 5: 308 + 77 = 385
Step 6: 385 + 77 = 462
Step 7: 462 + 77 = 539
Step 8: 539 + 77 = 616
Step 9: 616 + 77 = 693
Step 10: 693 + 77 = 770
Step 11: 770 + 77 = 847
Step 12: 847 + 77 = 924
Step 13: 924 + 77 = 1001
Step 14: 1001 + 77 = 1078
Step 15: 1078 + 77 = 1155
Step 16: 1155 + 77 = 1232
Step 17: 1232 + 77 = 1309
Step 18: 1309 + 77 = 1386
Step 19: 1386 + 77 = 1463
Step 20: 1463 + 77 = 1540
Step 21: 1540 + 77 = 1617
Step 22: 1617 + 77 = 1694
Step 23: 1694 + 77 = 1771
Step 24: 1771 + 77 = 1848
Step 25: 1848 + 77 = 1925
Step 26: 1925 + 77 = 2002
Step 27: 2002 + 77 = 2079
Step 28: 2079 + 77 = 2156
Step 29: 2156 + 77 = 2233
Step 30: 2233 + 77 = 2310
Step 31: 2310 + 77 = 2387
Step 32: 2387 + 77 = 2464
Step 33: 2464 + 77 = 2541
Step 34: 2541 + 77 = 2618
Step 35: 2618 + 77 = 2695
Step 36: 2695 + 77 = 2772
Step 37: 2772 + 77 = 2849
Step 38: 2849 + 77 = 2926
Step 39: 2926 + 77 = 3003
Step 40: 3003 + 77 = 3080
Step 41: 3080 + 77 = 3157
Step 42: 3157 + 77 = 3234
Step 43: 3234 + 77 = 3311
Step 44: 3311 + 77 = 3388
Step 45: 3388 + 77 = 3465
Step 46: 3465 + 77 = 3542
Step 47: 3542 + 77 = 3619
Step 48: 3619 + 77 = 3696
Step 49: 3696 + 77 = 3773
Step 50: 3773 + 77 = 3850
Step 51: 3850 + 77 = 3927
Step 52: 3927 + 77 = 4004
Step 53: 4004 + 77 = 4081
Step 54: 4081 + 77 = 4158
Step 55: 4158 + 77 = 4235
Step 56: 4235 + 77 = 4312
Step 57: 4312 + 77 = 4389
Step 58: 4389 + 77 = 4466
Step 59: 4466 + 77 = 4543
Step 60: 4543 + 77 = 4620
Step 61: 4620 + 77 = 4697
Step 62: 4697 + 77 = 4774
Step 63: 4774 + 77 = 4851
Step 64: 4851 + 77 = 4928
Step 65: 4928 + 77 = 5005
Step 66: 5005 + 77 = 5082
Step 67: 5082 + 77 = 5159
Step 68: 5159 + 77 = 5236
Step 69: 5236 + 77 = 5313
Step 70: 5313 + 77 = 5390
Step 71: 5390 + 77 = 5467
Step 72: 5467 + 77 = 5544
Step 73: 5544 + 77 = 5621
Step 74: 5621 + 77 = 5698
Step 75: 5698 + 77 = 5775
Step 76: 5775 + 77 = 5852
Step 77: 5852 + 77 = 5929
Step 78: 5929 + 77 = 6006
Step 79: 6006 + 77 = 6083
Step 80: 6083 + 77 = 6160
Step 81: 6160 + 77 = 6237
Step 82: 6237 + 77 = 6314
Step 83: 6314 + 77 = 6391
Step 84: 6391 + 77 = 6468

So, 77*84 = 6468