Alright, let's solve this math problem step by step. First, we have the number 256. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 138. So, we're going to take the number 256 and add it to itself 138 times.
Step 1: 0 + 256 = 256
Step 2: 256 + 256 = 512
Step 3: 512 + 256 = 768
Step 4: 768 + 256 = 1024
Step 5: 1024 + 256 = 1280
Step 6: 1280 + 256 = 1536
Step 7: 1536 + 256 = 1792
Step 8: 1792 + 256 = 2048
Step 9: 2048 + 256 = 2304
Step 10: 2304 + 256 = 2560
Step 11: 2560 + 256 = 2816
Step 12: 2816 + 256 = 3072
Step 13: 3072 + 256 = 3328
Step 14: 3328 + 256 = 3584
Step 15: 3584 + 256 = 3840
Step 16: 3840 + 256 = 4096
Step 17: 4096 + 256 = 4352
Step 18: 4352 + 256 = 4608
Step 19: 4608 + 256 = 4864
Step 20: 4864 + 256 = 5120
Step 21: 5120 + 256 = 5376
Step 22: 5376 + 256 = 5632
Step 23: 5632 + 256 = 5888
Step 24: 5888 + 256 = 6144
Step 25: 6144 + 256 = 6400
Step 26: 6400 + 256 = 6656
Step 27: 6656 + 256 = 6912
Step 28: 6912 + 256 = 7168
Step 29: 7168 + 256 = 7424
Step 30: 7424 + 256 = 7680
Step 31: 7680 + 256 = 7936
Step 32: 7936 + 256 = 8192
Step 33: 8192 + 256 = 8448
Step 34: 8448 + 256 = 8704
Step 35: 8704 + 256 = 8960
Step 36: 8960 + 256 = 9216
Step 37: 9216 + 256 = 9472
Step 38: 9472 + 256 = 9728
Step 39: 9728 + 256 = 9984
Step 40: 9984 + 256 = 10240
Step 41: 10240 + 256 = 10496
Step 42: 10496 + 256 = 10752
Step 43: 10752 + 256 = 11008
Step 44: 11008 + 256 = 11264
Step 45: 11264 + 256 = 11520
Step 46: 11520 + 256 = 11776
Step 47: 11776 + 256 = 12032
Step 48: 12032 + 256 = 12288
Step 49: 12288 + 256 = 12544
Step 50: 12544 + 256 = 12800
Step 51: 12800 + 256 = 13056
Step 52: 13056 + 256 = 13312
Step 53: 13312 + 256 = 13568
Step 54: 13568 + 256 = 13824
Step 55: 13824 + 256 = 14080
Step 56: 14080 + 256 = 14336
Step 57: 14336 + 256 = 14592
Step 58: 14592 + 256 = 14848
Step 59: 14848 + 256 = 15104
Step 60: 15104 + 256 = 15360
Step 61: 15360 + 256 = 15616
Step 62: 15616 + 256 = 15872
Step 63: 15872 + 256 = 16128
Step 64: 16128 + 256 = 16384
Step 65: 16384 + 256 = 16640
Step 66: 16640 + 256 = 16896
Step 67: 16896 + 256 = 17152
Step 68: 17152 + 256 = 17408
Step 69: 17408 + 256 = 17664
Step 70: 17664 + 256 = 17920
Step 71: 17920 + 256 = 18176
Step 72: 18176 + 256 = 18432
Step 73: 18432 + 256 = 18688
Step 74: 18688 + 256 = 18944
Step 75: 18944 + 256 = 19200
Step 76: 19200 + 256 = 19456
Step 77: 19456 + 256 = 19712
Step 78: 19712 + 256 = 19968
Step 79: 19968 + 256 = 20224
Step 80: 20224 + 256 = 20480
Step 81: 20480 + 256 = 20736
Step 82: 20736 + 256 = 20992
Step 83: 20992 + 256 = 21248
Step 84: 21248 + 256 = 21504
Step 85: 21504 + 256 = 21760
Step 86: 21760 + 256 = 22016
Step 87: 22016 + 256 = 22272
Step 88: 22272 + 256 = 22528
Step 89: 22528 + 256 = 22784
Step 90: 22784 + 256 = 23040
Step 91: 23040 + 256 = 23296
Step 92: 23296 + 256 = 23552
Step 93: 23552 + 256 = 23808
Step 94: 23808 + 256 = 24064
Step 95: 24064 + 256 = 24320
Step 96: 24320 + 256 = 24576
Step 97: 24576 + 256 = 24832
Step 98: 24832 + 256 = 25088
Step 99: 25088 + 256 = 25344
Step 100: 25344 + 256 = 25600
Step 101: 25600 + 256 = 25856
Step 102: 25856 + 256 = 26112
Step 103: 26112 + 256 = 26368
Step 104: 26368 + 256 = 26624
Step 105: 26624 + 256 = 26880
Step 106: 26880 + 256 = 27136
Step 107: 27136 + 256 = 27392
Step 108: 27392 + 256 = 27648
Step 109: 27648 + 256 = 27904
Step 110: 27904 + 256 = 28160
Step 111: 28160 + 256 = 28416
Step 112: 28416 + 256 = 28672
Step 113: 28672 + 256 = 28928
Step 114: 28928 + 256 = 29184
Step 115: 29184 + 256 = 29440
Step 116: 29440 + 256 = 29696
Step 117: 29696 + 256 = 29952
Step 118: 29952 + 256 = 30208
Step 119: 30208 + 256 = 30464
Step 120: 30464 + 256 = 30720
Step 121: 30720 + 256 = 30976
Step 122: 30976 + 256 = 31232
Step 123: 31232 + 256 = 31488
Step 124: 31488 + 256 = 31744
Step 125: 31744 + 256 = 32000
Step 126: 32000 + 256 = 32256
Step 127: 32256 + 256 = 32512
Step 128: 32512 + 256 = 32768
Step 129: 32768 + 256 = 33024
Step 130: 33024 + 256 = 33280
Step 131: 33280 + 256 = 33536
Step 132: 33536 + 256 = 33792
Step 133: 33792 + 256 = 34048
Step 134: 34048 + 256 = 34304
Step 135: 34304 + 256 = 34560
Step 136: 34560 + 256 = 34816
Step 137: 34816 + 256 = 35072
Step 138: 35072 + 256 = 35328

So, 256*138 = 35328