Let's get this math done. We have 66 and we're going to multiply it by 108. This is the same as taking 66 and adding it to itself 108 times.
Step 1: 0 + 66 = 66
Step 2: 66 + 66 = 132
Step 3: 132 + 66 = 198
Step 4: 198 + 66 = 264
Step 5: 264 + 66 = 330
Step 6: 330 + 66 = 396
Step 7: 396 + 66 = 462
Step 8: 462 + 66 = 528
Step 9: 528 + 66 = 594
Step 10: 594 + 66 = 660
Step 11: 660 + 66 = 726
Step 12: 726 + 66 = 792
Step 13: 792 + 66 = 858
Step 14: 858 + 66 = 924
Step 15: 924 + 66 = 990
Step 16: 990 + 66 = 1056
Step 17: 1056 + 66 = 1122
Step 18: 1122 + 66 = 1188
Step 19: 1188 + 66 = 1254
Step 20: 1254 + 66 = 1320
Step 21: 1320 + 66 = 1386
Step 22: 1386 + 66 = 1452
Step 23: 1452 + 66 = 1518
Step 24: 1518 + 66 = 1584
Step 25: 1584 + 66 = 1650
Step 26: 1650 + 66 = 1716
Step 27: 1716 + 66 = 1782
Step 28: 1782 + 66 = 1848
Step 29: 1848 + 66 = 1914
Step 30: 1914 + 66 = 1980
Step 31: 1980 + 66 = 2046
Step 32: 2046 + 66 = 2112
Step 33: 2112 + 66 = 2178
Step 34: 2178 + 66 = 2244
Step 35: 2244 + 66 = 2310
Step 36: 2310 + 66 = 2376
Step 37: 2376 + 66 = 2442
Step 38: 2442 + 66 = 2508
Step 39: 2508 + 66 = 2574
Step 40: 2574 + 66 = 2640
Step 41: 2640 + 66 = 2706
Step 42: 2706 + 66 = 2772
Step 43: 2772 + 66 = 2838
Step 44: 2838 + 66 = 2904
Step 45: 2904 + 66 = 2970
Step 46: 2970 + 66 = 3036
Step 47: 3036 + 66 = 3102
Step 48: 3102 + 66 = 3168
Step 49: 3168 + 66 = 3234
Step 50: 3234 + 66 = 3300
Step 51: 3300 + 66 = 3366
Step 52: 3366 + 66 = 3432
Step 53: 3432 + 66 = 3498
Step 54: 3498 + 66 = 3564
Step 55: 3564 + 66 = 3630
Step 56: 3630 + 66 = 3696
Step 57: 3696 + 66 = 3762
Step 58: 3762 + 66 = 3828
Step 59: 3828 + 66 = 3894
Step 60: 3894 + 66 = 3960
Step 61: 3960 + 66 = 4026
Step 62: 4026 + 66 = 4092
Step 63: 4092 + 66 = 4158
Step 64: 4158 + 66 = 4224
Step 65: 4224 + 66 = 4290
Step 66: 4290 + 66 = 4356
Step 67: 4356 + 66 = 4422
Step 68: 4422 + 66 = 4488
Step 69: 4488 + 66 = 4554
Step 70: 4554 + 66 = 4620
Step 71: 4620 + 66 = 4686
Step 72: 4686 + 66 = 4752
Step 73: 4752 + 66 = 4818
Step 74: 4818 + 66 = 4884
Step 75: 4884 + 66 = 4950
Step 76: 4950 + 66 = 5016
Step 77: 5016 + 66 = 5082
Step 78: 5082 + 66 = 5148
Step 79: 5148 + 66 = 5214
Step 80: 5214 + 66 = 5280
Step 81: 5280 + 66 = 5346
Step 82: 5346 + 66 = 5412
Step 83: 5412 + 66 = 5478
Step 84: 5478 + 66 = 5544
Step 85: 5544 + 66 = 5610
Step 86: 5610 + 66 = 5676
Step 87: 5676 + 66 = 5742
Step 88: 5742 + 66 = 5808
Step 89: 5808 + 66 = 5874
Step 90: 5874 + 66 = 5940
Step 91: 5940 + 66 = 6006
Step 92: 6006 + 66 = 6072
Step 93: 6072 + 66 = 6138
Step 94: 6138 + 66 = 6204
Step 95: 6204 + 66 = 6270
Step 96: 6270 + 66 = 6336
Step 97: 6336 + 66 = 6402
Step 98: 6402 + 66 = 6468
Step 99: 6468 + 66 = 6534
Step 100: 6534 + 66 = 6600
Step 101: 6600 + 66 = 6666
Step 102: 6666 + 66 = 6732
Step 103: 6732 + 66 = 6798
Step 104: 6798 + 66 = 6864
Step 105: 6864 + 66 = 6930
Step 106: 6930 + 66 = 6996
Step 107: 6996 + 66 = 7062
Step 108: 7062 + 66 = 7128

So, 66*108 = 7128