Alright, let's solve this math problem step by step. First, we have the number 42. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 189. So, we're going to take the number 42 and add it to itself 189 times.
Step 1: 0 + 42 = 42
Step 2: 42 + 42 = 84
Step 3: 84 + 42 = 126
Step 4: 126 + 42 = 168
Step 5: 168 + 42 = 210
Step 6: 210 + 42 = 252
Step 7: 252 + 42 = 294
Step 8: 294 + 42 = 336
Step 9: 336 + 42 = 378
Step 10: 378 + 42 = 420
Step 11: 420 + 42 = 462
Step 12: 462 + 42 = 504
Step 13: 504 + 42 = 546
Step 14: 546 + 42 = 588
Step 15: 588 + 42 = 630
Step 16: 630 + 42 = 672
Step 17: 672 + 42 = 714
Step 18: 714 + 42 = 756
Step 19: 756 + 42 = 798
Step 20: 798 + 42 = 840
Step 21: 840 + 42 = 882
Step 22: 882 + 42 = 924
Step 23: 924 + 42 = 966
Step 24: 966 + 42 = 1008
Step 25: 1008 + 42 = 1050
Step 26: 1050 + 42 = 1092
Step 27: 1092 + 42 = 1134
Step 28: 1134 + 42 = 1176
Step 29: 1176 + 42 = 1218
Step 30: 1218 + 42 = 1260
Step 31: 1260 + 42 = 1302
Step 32: 1302 + 42 = 1344
Step 33: 1344 + 42 = 1386
Step 34: 1386 + 42 = 1428
Step 35: 1428 + 42 = 1470
Step 36: 1470 + 42 = 1512
Step 37: 1512 + 42 = 1554
Step 38: 1554 + 42 = 1596
Step 39: 1596 + 42 = 1638
Step 40: 1638 + 42 = 1680
Step 41: 1680 + 42 = 1722
Step 42: 1722 + 42 = 1764
Step 43: 1764 + 42 = 1806
Step 44: 1806 + 42 = 1848
Step 45: 1848 + 42 = 1890
Step 46: 1890 + 42 = 1932
Step 47: 1932 + 42 = 1974
Step 48: 1974 + 42 = 2016
Step 49: 2016 + 42 = 2058
Step 50: 2058 + 42 = 2100
Step 51: 2100 + 42 = 2142
Step 52: 2142 + 42 = 2184
Step 53: 2184 + 42 = 2226
Step 54: 2226 + 42 = 2268
Step 55: 2268 + 42 = 2310
Step 56: 2310 + 42 = 2352
Step 57: 2352 + 42 = 2394
Step 58: 2394 + 42 = 2436
Step 59: 2436 + 42 = 2478
Step 60: 2478 + 42 = 2520
Step 61: 2520 + 42 = 2562
Step 62: 2562 + 42 = 2604
Step 63: 2604 + 42 = 2646
Step 64: 2646 + 42 = 2688
Step 65: 2688 + 42 = 2730
Step 66: 2730 + 42 = 2772
Step 67: 2772 + 42 = 2814
Step 68: 2814 + 42 = 2856
Step 69: 2856 + 42 = 2898
Step 70: 2898 + 42 = 2940
Step 71: 2940 + 42 = 2982
Step 72: 2982 + 42 = 3024
Step 73: 3024 + 42 = 3066
Step 74: 3066 + 42 = 3108
Step 75: 3108 + 42 = 3150
Step 76: 3150 + 42 = 3192
Step 77: 3192 + 42 = 3234
Step 78: 3234 + 42 = 3276
Step 79: 3276 + 42 = 3318
Step 80: 3318 + 42 = 3360
Step 81: 3360 + 42 = 3402
Step 82: 3402 + 42 = 3444
Step 83: 3444 + 42 = 3486
Step 84: 3486 + 42 = 3528
Step 85: 3528 + 42 = 3570
Step 86: 3570 + 42 = 3612
Step 87: 3612 + 42 = 3654
Step 88: 3654 + 42 = 3696
Step 89: 3696 + 42 = 3738
Step 90: 3738 + 42 = 3780
Step 91: 3780 + 42 = 3822
Step 92: 3822 + 42 = 3864
Step 93: 3864 + 42 = 3906
Step 94: 3906 + 42 = 3948
Step 95: 3948 + 42 = 3990
Step 96: 3990 + 42 = 4032
Step 97: 4032 + 42 = 4074
Step 98: 4074 + 42 = 4116
Step 99: 4116 + 42 = 4158
Step 100: 4158 + 42 = 4200
Step 101: 4200 + 42 = 4242
Step 102: 4242 + 42 = 4284
Step 103: 4284 + 42 = 4326
Step 104: 4326 + 42 = 4368
Step 105: 4368 + 42 = 4410
Step 106: 4410 + 42 = 4452
Step 107: 4452 + 42 = 4494
Step 108: 4494 + 42 = 4536
Step 109: 4536 + 42 = 4578
Step 110: 4578 + 42 = 4620
Step 111: 4620 + 42 = 4662
Step 112: 4662 + 42 = 4704
Step 113: 4704 + 42 = 4746
Step 114: 4746 + 42 = 4788
Step 115: 4788 + 42 = 4830
Step 116: 4830 + 42 = 4872
Step 117: 4872 + 42 = 4914
Step 118: 4914 + 42 = 4956
Step 119: 4956 + 42 = 4998
Step 120: 4998 + 42 = 5040
Step 121: 5040 + 42 = 5082
Step 122: 5082 + 42 = 5124
Step 123: 5124 + 42 = 5166
Step 124: 5166 + 42 = 5208
Step 125: 5208 + 42 = 5250
Step 126: 5250 + 42 = 5292
Step 127: 5292 + 42 = 5334
Step 128: 5334 + 42 = 5376
Step 129: 5376 + 42 = 5418
Step 130: 5418 + 42 = 5460
Step 131: 5460 + 42 = 5502
Step 132: 5502 + 42 = 5544
Step 133: 5544 + 42 = 5586
Step 134: 5586 + 42 = 5628
Step 135: 5628 + 42 = 5670
Step 136: 5670 + 42 = 5712
Step 137: 5712 + 42 = 5754
Step 138: 5754 + 42 = 5796
Step 139: 5796 + 42 = 5838
Step 140: 5838 + 42 = 5880
Step 141: 5880 + 42 = 5922
Step 142: 5922 + 42 = 5964
Step 143: 5964 + 42 = 6006
Step 144: 6006 + 42 = 6048
Step 145: 6048 + 42 = 6090
Step 146: 6090 + 42 = 6132
Step 147: 6132 + 42 = 6174
Step 148: 6174 + 42 = 6216
Step 149: 6216 + 42 = 6258
Step 150: 6258 + 42 = 6300
Step 151: 6300 + 42 = 6342
Step 152: 6342 + 42 = 6384
Step 153: 6384 + 42 = 6426
Step 154: 6426 + 42 = 6468
Step 155: 6468 + 42 = 6510
Step 156: 6510 + 42 = 6552
Step 157: 6552 + 42 = 6594
Step 158: 6594 + 42 = 6636
Step 159: 6636 + 42 = 6678
Step 160: 6678 + 42 = 6720
Step 161: 6720 + 42 = 6762
Step 162: 6762 + 42 = 6804
Step 163: 6804 + 42 = 6846
Step 164: 6846 + 42 = 6888
Step 165: 6888 + 42 = 6930
Step 166: 6930 + 42 = 6972
Step 167: 6972 + 42 = 7014
Step 168: 7014 + 42 = 7056
Step 169: 7056 + 42 = 7098
Step 170: 7098 + 42 = 7140
Step 171: 7140 + 42 = 7182
Step 172: 7182 + 42 = 7224
Step 173: 7224 + 42 = 7266
Step 174: 7266 + 42 = 7308
Step 175: 7308 + 42 = 7350
Step 176: 7350 + 42 = 7392
Step 177: 7392 + 42 = 7434
Step 178: 7434 + 42 = 7476
Step 179: 7476 + 42 = 7518
Step 180: 7518 + 42 = 7560
Step 181: 7560 + 42 = 7602
Step 182: 7602 + 42 = 7644
Step 183: 7644 + 42 = 7686
Step 184: 7686 + 42 = 7728
Step 185: 7728 + 42 = 7770
Step 186: 7770 + 42 = 7812
Step 187: 7812 + 42 = 7854
Step 188: 7854 + 42 = 7896
Step 189: 7896 + 42 = 7938

So, 42*189 = 7938