OK, let's crack this. We're given 511 and our task is to multiply it by 79. Essentially, we'll be adding 511 to itself 79 times.
Step 1: 0 + 511 = 511
Step 2: 511 + 511 = 1022
Step 3: 1022 + 511 = 1533
Step 4: 1533 + 511 = 2044
Step 5: 2044 + 511 = 2555
Step 6: 2555 + 511 = 3066
Step 7: 3066 + 511 = 3577
Step 8: 3577 + 511 = 4088
Step 9: 4088 + 511 = 4599
Step 10: 4599 + 511 = 5110
Step 11: 5110 + 511 = 5621
Step 12: 5621 + 511 = 6132
Step 13: 6132 + 511 = 6643
Step 14: 6643 + 511 = 7154
Step 15: 7154 + 511 = 7665
Step 16: 7665 + 511 = 8176
Step 17: 8176 + 511 = 8687
Step 18: 8687 + 511 = 9198
Step 19: 9198 + 511 = 9709
Step 20: 9709 + 511 = 10220
Step 21: 10220 + 511 = 10731
Step 22: 10731 + 511 = 11242
Step 23: 11242 + 511 = 11753
Step 24: 11753 + 511 = 12264
Step 25: 12264 + 511 = 12775
Step 26: 12775 + 511 = 13286
Step 27: 13286 + 511 = 13797
Step 28: 13797 + 511 = 14308
Step 29: 14308 + 511 = 14819
Step 30: 14819 + 511 = 15330
Step 31: 15330 + 511 = 15841
Step 32: 15841 + 511 = 16352
Step 33: 16352 + 511 = 16863
Step 34: 16863 + 511 = 17374
Step 35: 17374 + 511 = 17885
Step 36: 17885 + 511 = 18396
Step 37: 18396 + 511 = 18907
Step 38: 18907 + 511 = 19418
Step 39: 19418 + 511 = 19929
Step 40: 19929 + 511 = 20440
Step 41: 20440 + 511 = 20951
Step 42: 20951 + 511 = 21462
Step 43: 21462 + 511 = 21973
Step 44: 21973 + 511 = 22484
Step 45: 22484 + 511 = 22995
Step 46: 22995 + 511 = 23506
Step 47: 23506 + 511 = 24017
Step 48: 24017 + 511 = 24528
Step 49: 24528 + 511 = 25039
Step 50: 25039 + 511 = 25550
Step 51: 25550 + 511 = 26061
Step 52: 26061 + 511 = 26572
Step 53: 26572 + 511 = 27083
Step 54: 27083 + 511 = 27594
Step 55: 27594 + 511 = 28105
Step 56: 28105 + 511 = 28616
Step 57: 28616 + 511 = 29127
Step 58: 29127 + 511 = 29638
Step 59: 29638 + 511 = 30149
Step 60: 30149 + 511 = 30660
Step 61: 30660 + 511 = 31171
Step 62: 31171 + 511 = 31682
Step 63: 31682 + 511 = 32193
Step 64: 32193 + 511 = 32704
Step 65: 32704 + 511 = 33215
Step 66: 33215 + 511 = 33726
Step 67: 33726 + 511 = 34237
Step 68: 34237 + 511 = 34748
Step 69: 34748 + 511 = 35259
Step 70: 35259 + 511 = 35770
Step 71: 35770 + 511 = 36281
Step 72: 36281 + 511 = 36792
Step 73: 36792 + 511 = 37303
Step 74: 37303 + 511 = 37814
Step 75: 37814 + 511 = 38325
Step 76: 38325 + 511 = 38836
Step 77: 38836 + 511 = 39347
Step 78: 39347 + 511 = 39858
Step 79: 39858 + 511 = 40369

So, 511*79 = 40369