OK, let's work through this together. We're starting with 651 and we're going to multiply it by 77, which means we add 651 to itself 77 times.
Step 1: 0 + 651 = 651
Step 2: 651 + 651 = 1302
Step 3: 1302 + 651 = 1953
Step 4: 1953 + 651 = 2604
Step 5: 2604 + 651 = 3255
Step 6: 3255 + 651 = 3906
Step 7: 3906 + 651 = 4557
Step 8: 4557 + 651 = 5208
Step 9: 5208 + 651 = 5859
Step 10: 5859 + 651 = 6510
Step 11: 6510 + 651 = 7161
Step 12: 7161 + 651 = 7812
Step 13: 7812 + 651 = 8463
Step 14: 8463 + 651 = 9114
Step 15: 9114 + 651 = 9765
Step 16: 9765 + 651 = 10416
Step 17: 10416 + 651 = 11067
Step 18: 11067 + 651 = 11718
Step 19: 11718 + 651 = 12369
Step 20: 12369 + 651 = 13020
Step 21: 13020 + 651 = 13671
Step 22: 13671 + 651 = 14322
Step 23: 14322 + 651 = 14973
Step 24: 14973 + 651 = 15624
Step 25: 15624 + 651 = 16275
Step 26: 16275 + 651 = 16926
Step 27: 16926 + 651 = 17577
Step 28: 17577 + 651 = 18228
Step 29: 18228 + 651 = 18879
Step 30: 18879 + 651 = 19530
Step 31: 19530 + 651 = 20181
Step 32: 20181 + 651 = 20832
Step 33: 20832 + 651 = 21483
Step 34: 21483 + 651 = 22134
Step 35: 22134 + 651 = 22785
Step 36: 22785 + 651 = 23436
Step 37: 23436 + 651 = 24087
Step 38: 24087 + 651 = 24738
Step 39: 24738 + 651 = 25389
Step 40: 25389 + 651 = 26040
Step 41: 26040 + 651 = 26691
Step 42: 26691 + 651 = 27342
Step 43: 27342 + 651 = 27993
Step 44: 27993 + 651 = 28644
Step 45: 28644 + 651 = 29295
Step 46: 29295 + 651 = 29946
Step 47: 29946 + 651 = 30597
Step 48: 30597 + 651 = 31248
Step 49: 31248 + 651 = 31899
Step 50: 31899 + 651 = 32550
Step 51: 32550 + 651 = 33201
Step 52: 33201 + 651 = 33852
Step 53: 33852 + 651 = 34503
Step 54: 34503 + 651 = 35154
Step 55: 35154 + 651 = 35805
Step 56: 35805 + 651 = 36456
Step 57: 36456 + 651 = 37107
Step 58: 37107 + 651 = 37758
Step 59: 37758 + 651 = 38409
Step 60: 38409 + 651 = 39060
Step 61: 39060 + 651 = 39711
Step 62: 39711 + 651 = 40362
Step 63: 40362 + 651 = 41013
Step 64: 41013 + 651 = 41664
Step 65: 41664 + 651 = 42315
Step 66: 42315 + 651 = 42966
Step 67: 42966 + 651 = 43617
Step 68: 43617 + 651 = 44268
Step 69: 44268 + 651 = 44919
Step 70: 44919 + 651 = 45570
Step 71: 45570 + 651 = 46221
Step 72: 46221 + 651 = 46872
Step 73: 46872 + 651 = 47523
Step 74: 47523 + 651 = 48174
Step 75: 48174 + 651 = 48825
Step 76: 48825 + 651 = 49476
Step 77: 49476 + 651 = 50127

So, 651*77 = 50127