Alright, let's solve this math problem step by step. First, we have the number 638. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 166. So, we're going to take the number 638 and add it to itself 166 times.
Step 1: 0 + 638 = 638
Step 2: 638 + 638 = 1276
Step 3: 1276 + 638 = 1914
Step 4: 1914 + 638 = 2552
Step 5: 2552 + 638 = 3190
Step 6: 3190 + 638 = 3828
Step 7: 3828 + 638 = 4466
Step 8: 4466 + 638 = 5104
Step 9: 5104 + 638 = 5742
Step 10: 5742 + 638 = 6380
Step 11: 6380 + 638 = 7018
Step 12: 7018 + 638 = 7656
Step 13: 7656 + 638 = 8294
Step 14: 8294 + 638 = 8932
Step 15: 8932 + 638 = 9570
Step 16: 9570 + 638 = 10208
Step 17: 10208 + 638 = 10846
Step 18: 10846 + 638 = 11484
Step 19: 11484 + 638 = 12122
Step 20: 12122 + 638 = 12760
Step 21: 12760 + 638 = 13398
Step 22: 13398 + 638 = 14036
Step 23: 14036 + 638 = 14674
Step 24: 14674 + 638 = 15312
Step 25: 15312 + 638 = 15950
Step 26: 15950 + 638 = 16588
Step 27: 16588 + 638 = 17226
Step 28: 17226 + 638 = 17864
Step 29: 17864 + 638 = 18502
Step 30: 18502 + 638 = 19140
Step 31: 19140 + 638 = 19778
Step 32: 19778 + 638 = 20416
Step 33: 20416 + 638 = 21054
Step 34: 21054 + 638 = 21692
Step 35: 21692 + 638 = 22330
Step 36: 22330 + 638 = 22968
Step 37: 22968 + 638 = 23606
Step 38: 23606 + 638 = 24244
Step 39: 24244 + 638 = 24882
Step 40: 24882 + 638 = 25520
Step 41: 25520 + 638 = 26158
Step 42: 26158 + 638 = 26796
Step 43: 26796 + 638 = 27434
Step 44: 27434 + 638 = 28072
Step 45: 28072 + 638 = 28710
Step 46: 28710 + 638 = 29348
Step 47: 29348 + 638 = 29986
Step 48: 29986 + 638 = 30624
Step 49: 30624 + 638 = 31262
Step 50: 31262 + 638 = 31900
Step 51: 31900 + 638 = 32538
Step 52: 32538 + 638 = 33176
Step 53: 33176 + 638 = 33814
Step 54: 33814 + 638 = 34452
Step 55: 34452 + 638 = 35090
Step 56: 35090 + 638 = 35728
Step 57: 35728 + 638 = 36366
Step 58: 36366 + 638 = 37004
Step 59: 37004 + 638 = 37642
Step 60: 37642 + 638 = 38280
Step 61: 38280 + 638 = 38918
Step 62: 38918 + 638 = 39556
Step 63: 39556 + 638 = 40194
Step 64: 40194 + 638 = 40832
Step 65: 40832 + 638 = 41470
Step 66: 41470 + 638 = 42108
Step 67: 42108 + 638 = 42746
Step 68: 42746 + 638 = 43384
Step 69: 43384 + 638 = 44022
Step 70: 44022 + 638 = 44660
Step 71: 44660 + 638 = 45298
Step 72: 45298 + 638 = 45936
Step 73: 45936 + 638 = 46574
Step 74: 46574 + 638 = 47212
Step 75: 47212 + 638 = 47850
Step 76: 47850 + 638 = 48488
Step 77: 48488 + 638 = 49126
Step 78: 49126 + 638 = 49764
Step 79: 49764 + 638 = 50402
Step 80: 50402 + 638 = 51040
Step 81: 51040 + 638 = 51678
Step 82: 51678 + 638 = 52316
Step 83: 52316 + 638 = 52954
Step 84: 52954 + 638 = 53592
Step 85: 53592 + 638 = 54230
Step 86: 54230 + 638 = 54868
Step 87: 54868 + 638 = 55506
Step 88: 55506 + 638 = 56144
Step 89: 56144 + 638 = 56782
Step 90: 56782 + 638 = 57420
Step 91: 57420 + 638 = 58058
Step 92: 58058 + 638 = 58696
Step 93: 58696 + 638 = 59334
Step 94: 59334 + 638 = 59972
Step 95: 59972 + 638 = 60610
Step 96: 60610 + 638 = 61248
Step 97: 61248 + 638 = 61886
Step 98: 61886 + 638 = 62524
Step 99: 62524 + 638 = 63162
Step 100: 63162 + 638 = 63800
Step 101: 63800 + 638 = 64438
Step 102: 64438 + 638 = 65076
Step 103: 65076 + 638 = 65714
Step 104: 65714 + 638 = 66352
Step 105: 66352 + 638 = 66990
Step 106: 66990 + 638 = 67628
Step 107: 67628 + 638 = 68266
Step 108: 68266 + 638 = 68904
Step 109: 68904 + 638 = 69542
Step 110: 69542 + 638 = 70180
Step 111: 70180 + 638 = 70818
Step 112: 70818 + 638 = 71456
Step 113: 71456 + 638 = 72094
Step 114: 72094 + 638 = 72732
Step 115: 72732 + 638 = 73370
Step 116: 73370 + 638 = 74008
Step 117: 74008 + 638 = 74646
Step 118: 74646 + 638 = 75284
Step 119: 75284 + 638 = 75922
Step 120: 75922 + 638 = 76560
Step 121: 76560 + 638 = 77198
Step 122: 77198 + 638 = 77836
Step 123: 77836 + 638 = 78474
Step 124: 78474 + 638 = 79112
Step 125: 79112 + 638 = 79750
Step 126: 79750 + 638 = 80388
Step 127: 80388 + 638 = 81026
Step 128: 81026 + 638 = 81664
Step 129: 81664 + 638 = 82302
Step 130: 82302 + 638 = 82940
Step 131: 82940 + 638 = 83578
Step 132: 83578 + 638 = 84216
Step 133: 84216 + 638 = 84854
Step 134: 84854 + 638 = 85492
Step 135: 85492 + 638 = 86130
Step 136: 86130 + 638 = 86768
Step 137: 86768 + 638 = 87406
Step 138: 87406 + 638 = 88044
Step 139: 88044 + 638 = 88682
Step 140: 88682 + 638 = 89320
Step 141: 89320 + 638 = 89958
Step 142: 89958 + 638 = 90596
Step 143: 90596 + 638 = 91234
Step 144: 91234 + 638 = 91872
Step 145: 91872 + 638 = 92510
Step 146: 92510 + 638 = 93148
Step 147: 93148 + 638 = 93786
Step 148: 93786 + 638 = 94424
Step 149: 94424 + 638 = 95062
Step 150: 95062 + 638 = 95700
Step 151: 95700 + 638 = 96338
Step 152: 96338 + 638 = 96976
Step 153: 96976 + 638 = 97614
Step 154: 97614 + 638 = 98252
Step 155: 98252 + 638 = 98890
Step 156: 98890 + 638 = 99528
Step 157: 99528 + 638 = 100166
Step 158: 100166 + 638 = 100804
Step 159: 100804 + 638 = 101442
Step 160: 101442 + 638 = 102080
Step 161: 102080 + 638 = 102718
Step 162: 102718 + 638 = 103356
Step 163: 103356 + 638 = 103994
Step 164: 103994 + 638 = 104632
Step 165: 104632 + 638 = 105270
Step 166: 105270 + 638 = 105908

So, 638*166 = 105908