Without delay, let's solve this. We've got 204 and we will be multiplying it by 66, that is, adding 204 to itself 66 times.
Step 1: 0 + 204 = 204
Step 2: 204 + 204 = 408
Step 3: 408 + 204 = 612
Step 4: 612 + 204 = 816
Step 5: 816 + 204 = 1020
Step 6: 1020 + 204 = 1224
Step 7: 1224 + 204 = 1428
Step 8: 1428 + 204 = 1632
Step 9: 1632 + 204 = 1836
Step 10: 1836 + 204 = 2040
Step 11: 2040 + 204 = 2244
Step 12: 2244 + 204 = 2448
Step 13: 2448 + 204 = 2652
Step 14: 2652 + 204 = 2856
Step 15: 2856 + 204 = 3060
Step 16: 3060 + 204 = 3264
Step 17: 3264 + 204 = 3468
Step 18: 3468 + 204 = 3672
Step 19: 3672 + 204 = 3876
Step 20: 3876 + 204 = 4080
Step 21: 4080 + 204 = 4284
Step 22: 4284 + 204 = 4488
Step 23: 4488 + 204 = 4692
Step 24: 4692 + 204 = 4896
Step 25: 4896 + 204 = 5100
Step 26: 5100 + 204 = 5304
Step 27: 5304 + 204 = 5508
Step 28: 5508 + 204 = 5712
Step 29: 5712 + 204 = 5916
Step 30: 5916 + 204 = 6120
Step 31: 6120 + 204 = 6324
Step 32: 6324 + 204 = 6528
Step 33: 6528 + 204 = 6732
Step 34: 6732 + 204 = 6936
Step 35: 6936 + 204 = 7140
Step 36: 7140 + 204 = 7344
Step 37: 7344 + 204 = 7548
Step 38: 7548 + 204 = 7752
Step 39: 7752 + 204 = 7956
Step 40: 7956 + 204 = 8160
Step 41: 8160 + 204 = 8364
Step 42: 8364 + 204 = 8568
Step 43: 8568 + 204 = 8772
Step 44: 8772 + 204 = 8976
Step 45: 8976 + 204 = 9180
Step 46: 9180 + 204 = 9384
Step 47: 9384 + 204 = 9588
Step 48: 9588 + 204 = 9792
Step 49: 9792 + 204 = 9996
Step 50: 9996 + 204 = 10200
Step 51: 10200 + 204 = 10404
Step 52: 10404 + 204 = 10608
Step 53: 10608 + 204 = 10812
Step 54: 10812 + 204 = 11016
Step 55: 11016 + 204 = 11220
Step 56: 11220 + 204 = 11424
Step 57: 11424 + 204 = 11628
Step 58: 11628 + 204 = 11832
Step 59: 11832 + 204 = 12036
Step 60: 12036 + 204 = 12240
Step 61: 12240 + 204 = 12444
Step 62: 12444 + 204 = 12648
Step 63: 12648 + 204 = 12852
Step 64: 12852 + 204 = 13056
Step 65: 13056 + 204 = 13260
Step 66: 13260 + 204 = 13464

So, 204*66 = 13464