Sure thing, let's get straight to it. We start with 204 and we're going to multiply it by 138, which means adding 204 to itself 138 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
Step 67: 13464 + 204 = 13668
Step 68: 13668 + 204 = 13872
Step 69: 13872 + 204 = 14076
Step 70: 14076 + 204 = 14280
Step 71: 14280 + 204 = 14484
Step 72: 14484 + 204 = 14688
Step 73: 14688 + 204 = 14892
Step 74: 14892 + 204 = 15096
Step 75: 15096 + 204 = 15300
Step 76: 15300 + 204 = 15504
Step 77: 15504 + 204 = 15708
Step 78: 15708 + 204 = 15912
Step 79: 15912 + 204 = 16116
Step 80: 16116 + 204 = 16320
Step 81: 16320 + 204 = 16524
Step 82: 16524 + 204 = 16728
Step 83: 16728 + 204 = 16932
Step 84: 16932 + 204 = 17136
Step 85: 17136 + 204 = 17340
Step 86: 17340 + 204 = 17544
Step 87: 17544 + 204 = 17748
Step 88: 17748 + 204 = 17952
Step 89: 17952 + 204 = 18156
Step 90: 18156 + 204 = 18360
Step 91: 18360 + 204 = 18564
Step 92: 18564 + 204 = 18768
Step 93: 18768 + 204 = 18972
Step 94: 18972 + 204 = 19176
Step 95: 19176 + 204 = 19380
Step 96: 19380 + 204 = 19584
Step 97: 19584 + 204 = 19788
Step 98: 19788 + 204 = 19992
Step 99: 19992 + 204 = 20196
Step 100: 20196 + 204 = 20400
Step 101: 20400 + 204 = 20604
Step 102: 20604 + 204 = 20808
Step 103: 20808 + 204 = 21012
Step 104: 21012 + 204 = 21216
Step 105: 21216 + 204 = 21420
Step 106: 21420 + 204 = 21624
Step 107: 21624 + 204 = 21828
Step 108: 21828 + 204 = 22032
Step 109: 22032 + 204 = 22236
Step 110: 22236 + 204 = 22440
Step 111: 22440 + 204 = 22644
Step 112: 22644 + 204 = 22848
Step 113: 22848 + 204 = 23052
Step 114: 23052 + 204 = 23256
Step 115: 23256 + 204 = 23460
Step 116: 23460 + 204 = 23664
Step 117: 23664 + 204 = 23868
Step 118: 23868 + 204 = 24072
Step 119: 24072 + 204 = 24276
Step 120: 24276 + 204 = 24480
Step 121: 24480 + 204 = 24684
Step 122: 24684 + 204 = 24888
Step 123: 24888 + 204 = 25092
Step 124: 25092 + 204 = 25296
Step 125: 25296 + 204 = 25500
Step 126: 25500 + 204 = 25704
Step 127: 25704 + 204 = 25908
Step 128: 25908 + 204 = 26112
Step 129: 26112 + 204 = 26316
Step 130: 26316 + 204 = 26520
Step 131: 26520 + 204 = 26724
Step 132: 26724 + 204 = 26928
Step 133: 26928 + 204 = 27132
Step 134: 27132 + 204 = 27336
Step 135: 27336 + 204 = 27540
Step 136: 27540 + 204 = 27744
Step 137: 27744 + 204 = 27948
Step 138: 27948 + 204 = 28152

So, 204*138 = 28152