Let's get this math done. We have 384 and we're going to multiply it by 129. This is the same as taking 384 and adding it to itself 129 times.
Step 1: 0 + 384 = 384
Step 2: 384 + 384 = 768
Step 3: 768 + 384 = 1152
Step 4: 1152 + 384 = 1536
Step 5: 1536 + 384 = 1920
Step 6: 1920 + 384 = 2304
Step 7: 2304 + 384 = 2688
Step 8: 2688 + 384 = 3072
Step 9: 3072 + 384 = 3456
Step 10: 3456 + 384 = 3840
Step 11: 3840 + 384 = 4224
Step 12: 4224 + 384 = 4608
Step 13: 4608 + 384 = 4992
Step 14: 4992 + 384 = 5376
Step 15: 5376 + 384 = 5760
Step 16: 5760 + 384 = 6144
Step 17: 6144 + 384 = 6528
Step 18: 6528 + 384 = 6912
Step 19: 6912 + 384 = 7296
Step 20: 7296 + 384 = 7680
Step 21: 7680 + 384 = 8064
Step 22: 8064 + 384 = 8448
Step 23: 8448 + 384 = 8832
Step 24: 8832 + 384 = 9216
Step 25: 9216 + 384 = 9600
Step 26: 9600 + 384 = 9984
Step 27: 9984 + 384 = 10368
Step 28: 10368 + 384 = 10752
Step 29: 10752 + 384 = 11136
Step 30: 11136 + 384 = 11520
Step 31: 11520 + 384 = 11904
Step 32: 11904 + 384 = 12288
Step 33: 12288 + 384 = 12672
Step 34: 12672 + 384 = 13056
Step 35: 13056 + 384 = 13440
Step 36: 13440 + 384 = 13824
Step 37: 13824 + 384 = 14208
Step 38: 14208 + 384 = 14592
Step 39: 14592 + 384 = 14976
Step 40: 14976 + 384 = 15360
Step 41: 15360 + 384 = 15744
Step 42: 15744 + 384 = 16128
Step 43: 16128 + 384 = 16512
Step 44: 16512 + 384 = 16896
Step 45: 16896 + 384 = 17280
Step 46: 17280 + 384 = 17664
Step 47: 17664 + 384 = 18048
Step 48: 18048 + 384 = 18432
Step 49: 18432 + 384 = 18816
Step 50: 18816 + 384 = 19200
Step 51: 19200 + 384 = 19584
Step 52: 19584 + 384 = 19968
Step 53: 19968 + 384 = 20352
Step 54: 20352 + 384 = 20736
Step 55: 20736 + 384 = 21120
Step 56: 21120 + 384 = 21504
Step 57: 21504 + 384 = 21888
Step 58: 21888 + 384 = 22272
Step 59: 22272 + 384 = 22656
Step 60: 22656 + 384 = 23040
Step 61: 23040 + 384 = 23424
Step 62: 23424 + 384 = 23808
Step 63: 23808 + 384 = 24192
Step 64: 24192 + 384 = 24576
Step 65: 24576 + 384 = 24960
Step 66: 24960 + 384 = 25344
Step 67: 25344 + 384 = 25728
Step 68: 25728 + 384 = 26112
Step 69: 26112 + 384 = 26496
Step 70: 26496 + 384 = 26880
Step 71: 26880 + 384 = 27264
Step 72: 27264 + 384 = 27648
Step 73: 27648 + 384 = 28032
Step 74: 28032 + 384 = 28416
Step 75: 28416 + 384 = 28800
Step 76: 28800 + 384 = 29184
Step 77: 29184 + 384 = 29568
Step 78: 29568 + 384 = 29952
Step 79: 29952 + 384 = 30336
Step 80: 30336 + 384 = 30720
Step 81: 30720 + 384 = 31104
Step 82: 31104 + 384 = 31488
Step 83: 31488 + 384 = 31872
Step 84: 31872 + 384 = 32256
Step 85: 32256 + 384 = 32640
Step 86: 32640 + 384 = 33024
Step 87: 33024 + 384 = 33408
Step 88: 33408 + 384 = 33792
Step 89: 33792 + 384 = 34176
Step 90: 34176 + 384 = 34560
Step 91: 34560 + 384 = 34944
Step 92: 34944 + 384 = 35328
Step 93: 35328 + 384 = 35712
Step 94: 35712 + 384 = 36096
Step 95: 36096 + 384 = 36480
Step 96: 36480 + 384 = 36864
Step 97: 36864 + 384 = 37248
Step 98: 37248 + 384 = 37632
Step 99: 37632 + 384 = 38016
Step 100: 38016 + 384 = 38400
Step 101: 38400 + 384 = 38784
Step 102: 38784 + 384 = 39168
Step 103: 39168 + 384 = 39552
Step 104: 39552 + 384 = 39936
Step 105: 39936 + 384 = 40320
Step 106: 40320 + 384 = 40704
Step 107: 40704 + 384 = 41088
Step 108: 41088 + 384 = 41472
Step 109: 41472 + 384 = 41856
Step 110: 41856 + 384 = 42240
Step 111: 42240 + 384 = 42624
Step 112: 42624 + 384 = 43008
Step 113: 43008 + 384 = 43392
Step 114: 43392 + 384 = 43776
Step 115: 43776 + 384 = 44160
Step 116: 44160 + 384 = 44544
Step 117: 44544 + 384 = 44928
Step 118: 44928 + 384 = 45312
Step 119: 45312 + 384 = 45696
Step 120: 45696 + 384 = 46080
Step 121: 46080 + 384 = 46464
Step 122: 46464 + 384 = 46848
Step 123: 46848 + 384 = 47232
Step 124: 47232 + 384 = 47616
Step 125: 47616 + 384 = 48000
Step 126: 48000 + 384 = 48384
Step 127: 48384 + 384 = 48768
Step 128: 48768 + 384 = 49152
Step 129: 49152 + 384 = 49536

So, 384*129 = 49536