Alright, let's solve this math problem step by step. First, we have the number 406. 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 406 and add it to itself 138 times.
Step 1: 0 + 406 = 406
Step 2: 406 + 406 = 812
Step 3: 812 + 406 = 1218
Step 4: 1218 + 406 = 1624
Step 5: 1624 + 406 = 2030
Step 6: 2030 + 406 = 2436
Step 7: 2436 + 406 = 2842
Step 8: 2842 + 406 = 3248
Step 9: 3248 + 406 = 3654
Step 10: 3654 + 406 = 4060
Step 11: 4060 + 406 = 4466
Step 12: 4466 + 406 = 4872
Step 13: 4872 + 406 = 5278
Step 14: 5278 + 406 = 5684
Step 15: 5684 + 406 = 6090
Step 16: 6090 + 406 = 6496
Step 17: 6496 + 406 = 6902
Step 18: 6902 + 406 = 7308
Step 19: 7308 + 406 = 7714
Step 20: 7714 + 406 = 8120
Step 21: 8120 + 406 = 8526
Step 22: 8526 + 406 = 8932
Step 23: 8932 + 406 = 9338
Step 24: 9338 + 406 = 9744
Step 25: 9744 + 406 = 10150
Step 26: 10150 + 406 = 10556
Step 27: 10556 + 406 = 10962
Step 28: 10962 + 406 = 11368
Step 29: 11368 + 406 = 11774
Step 30: 11774 + 406 = 12180
Step 31: 12180 + 406 = 12586
Step 32: 12586 + 406 = 12992
Step 33: 12992 + 406 = 13398
Step 34: 13398 + 406 = 13804
Step 35: 13804 + 406 = 14210
Step 36: 14210 + 406 = 14616
Step 37: 14616 + 406 = 15022
Step 38: 15022 + 406 = 15428
Step 39: 15428 + 406 = 15834
Step 40: 15834 + 406 = 16240
Step 41: 16240 + 406 = 16646
Step 42: 16646 + 406 = 17052
Step 43: 17052 + 406 = 17458
Step 44: 17458 + 406 = 17864
Step 45: 17864 + 406 = 18270
Step 46: 18270 + 406 = 18676
Step 47: 18676 + 406 = 19082
Step 48: 19082 + 406 = 19488
Step 49: 19488 + 406 = 19894
Step 50: 19894 + 406 = 20300
Step 51: 20300 + 406 = 20706
Step 52: 20706 + 406 = 21112
Step 53: 21112 + 406 = 21518
Step 54: 21518 + 406 = 21924
Step 55: 21924 + 406 = 22330
Step 56: 22330 + 406 = 22736
Step 57: 22736 + 406 = 23142
Step 58: 23142 + 406 = 23548
Step 59: 23548 + 406 = 23954
Step 60: 23954 + 406 = 24360
Step 61: 24360 + 406 = 24766
Step 62: 24766 + 406 = 25172
Step 63: 25172 + 406 = 25578
Step 64: 25578 + 406 = 25984
Step 65: 25984 + 406 = 26390
Step 66: 26390 + 406 = 26796
Step 67: 26796 + 406 = 27202
Step 68: 27202 + 406 = 27608
Step 69: 27608 + 406 = 28014
Step 70: 28014 + 406 = 28420
Step 71: 28420 + 406 = 28826
Step 72: 28826 + 406 = 29232
Step 73: 29232 + 406 = 29638
Step 74: 29638 + 406 = 30044
Step 75: 30044 + 406 = 30450
Step 76: 30450 + 406 = 30856
Step 77: 30856 + 406 = 31262
Step 78: 31262 + 406 = 31668
Step 79: 31668 + 406 = 32074
Step 80: 32074 + 406 = 32480
Step 81: 32480 + 406 = 32886
Step 82: 32886 + 406 = 33292
Step 83: 33292 + 406 = 33698
Step 84: 33698 + 406 = 34104
Step 85: 34104 + 406 = 34510
Step 86: 34510 + 406 = 34916
Step 87: 34916 + 406 = 35322
Step 88: 35322 + 406 = 35728
Step 89: 35728 + 406 = 36134
Step 90: 36134 + 406 = 36540
Step 91: 36540 + 406 = 36946
Step 92: 36946 + 406 = 37352
Step 93: 37352 + 406 = 37758
Step 94: 37758 + 406 = 38164
Step 95: 38164 + 406 = 38570
Step 96: 38570 + 406 = 38976
Step 97: 38976 + 406 = 39382
Step 98: 39382 + 406 = 39788
Step 99: 39788 + 406 = 40194
Step 100: 40194 + 406 = 40600
Step 101: 40600 + 406 = 41006
Step 102: 41006 + 406 = 41412
Step 103: 41412 + 406 = 41818
Step 104: 41818 + 406 = 42224
Step 105: 42224 + 406 = 42630
Step 106: 42630 + 406 = 43036
Step 107: 43036 + 406 = 43442
Step 108: 43442 + 406 = 43848
Step 109: 43848 + 406 = 44254
Step 110: 44254 + 406 = 44660
Step 111: 44660 + 406 = 45066
Step 112: 45066 + 406 = 45472
Step 113: 45472 + 406 = 45878
Step 114: 45878 + 406 = 46284
Step 115: 46284 + 406 = 46690
Step 116: 46690 + 406 = 47096
Step 117: 47096 + 406 = 47502
Step 118: 47502 + 406 = 47908
Step 119: 47908 + 406 = 48314
Step 120: 48314 + 406 = 48720
Step 121: 48720 + 406 = 49126
Step 122: 49126 + 406 = 49532
Step 123: 49532 + 406 = 49938
Step 124: 49938 + 406 = 50344
Step 125: 50344 + 406 = 50750
Step 126: 50750 + 406 = 51156
Step 127: 51156 + 406 = 51562
Step 128: 51562 + 406 = 51968
Step 129: 51968 + 406 = 52374
Step 130: 52374 + 406 = 52780
Step 131: 52780 + 406 = 53186
Step 132: 53186 + 406 = 53592
Step 133: 53592 + 406 = 53998
Step 134: 53998 + 406 = 54404
Step 135: 54404 + 406 = 54810
Step 136: 54810 + 406 = 55216
Step 137: 55216 + 406 = 55622
Step 138: 55622 + 406 = 56028

So, 406*138 = 56028