Alright, let's solve this math problem step by step. First, we have the number 858. 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 858 and add it to itself 138 times.
Step 1: 0 + 858 = 858
Step 2: 858 + 858 = 1716
Step 3: 1716 + 858 = 2574
Step 4: 2574 + 858 = 3432
Step 5: 3432 + 858 = 4290
Step 6: 4290 + 858 = 5148
Step 7: 5148 + 858 = 6006
Step 8: 6006 + 858 = 6864
Step 9: 6864 + 858 = 7722
Step 10: 7722 + 858 = 8580
Step 11: 8580 + 858 = 9438
Step 12: 9438 + 858 = 10296
Step 13: 10296 + 858 = 11154
Step 14: 11154 + 858 = 12012
Step 15: 12012 + 858 = 12870
Step 16: 12870 + 858 = 13728
Step 17: 13728 + 858 = 14586
Step 18: 14586 + 858 = 15444
Step 19: 15444 + 858 = 16302
Step 20: 16302 + 858 = 17160
Step 21: 17160 + 858 = 18018
Step 22: 18018 + 858 = 18876
Step 23: 18876 + 858 = 19734
Step 24: 19734 + 858 = 20592
Step 25: 20592 + 858 = 21450
Step 26: 21450 + 858 = 22308
Step 27: 22308 + 858 = 23166
Step 28: 23166 + 858 = 24024
Step 29: 24024 + 858 = 24882
Step 30: 24882 + 858 = 25740
Step 31: 25740 + 858 = 26598
Step 32: 26598 + 858 = 27456
Step 33: 27456 + 858 = 28314
Step 34: 28314 + 858 = 29172
Step 35: 29172 + 858 = 30030
Step 36: 30030 + 858 = 30888
Step 37: 30888 + 858 = 31746
Step 38: 31746 + 858 = 32604
Step 39: 32604 + 858 = 33462
Step 40: 33462 + 858 = 34320
Step 41: 34320 + 858 = 35178
Step 42: 35178 + 858 = 36036
Step 43: 36036 + 858 = 36894
Step 44: 36894 + 858 = 37752
Step 45: 37752 + 858 = 38610
Step 46: 38610 + 858 = 39468
Step 47: 39468 + 858 = 40326
Step 48: 40326 + 858 = 41184
Step 49: 41184 + 858 = 42042
Step 50: 42042 + 858 = 42900
Step 51: 42900 + 858 = 43758
Step 52: 43758 + 858 = 44616
Step 53: 44616 + 858 = 45474
Step 54: 45474 + 858 = 46332
Step 55: 46332 + 858 = 47190
Step 56: 47190 + 858 = 48048
Step 57: 48048 + 858 = 48906
Step 58: 48906 + 858 = 49764
Step 59: 49764 + 858 = 50622
Step 60: 50622 + 858 = 51480
Step 61: 51480 + 858 = 52338
Step 62: 52338 + 858 = 53196
Step 63: 53196 + 858 = 54054
Step 64: 54054 + 858 = 54912
Step 65: 54912 + 858 = 55770
Step 66: 55770 + 858 = 56628
Step 67: 56628 + 858 = 57486
Step 68: 57486 + 858 = 58344
Step 69: 58344 + 858 = 59202
Step 70: 59202 + 858 = 60060
Step 71: 60060 + 858 = 60918
Step 72: 60918 + 858 = 61776
Step 73: 61776 + 858 = 62634
Step 74: 62634 + 858 = 63492
Step 75: 63492 + 858 = 64350
Step 76: 64350 + 858 = 65208
Step 77: 65208 + 858 = 66066
Step 78: 66066 + 858 = 66924
Step 79: 66924 + 858 = 67782
Step 80: 67782 + 858 = 68640
Step 81: 68640 + 858 = 69498
Step 82: 69498 + 858 = 70356
Step 83: 70356 + 858 = 71214
Step 84: 71214 + 858 = 72072
Step 85: 72072 + 858 = 72930
Step 86: 72930 + 858 = 73788
Step 87: 73788 + 858 = 74646
Step 88: 74646 + 858 = 75504
Step 89: 75504 + 858 = 76362
Step 90: 76362 + 858 = 77220
Step 91: 77220 + 858 = 78078
Step 92: 78078 + 858 = 78936
Step 93: 78936 + 858 = 79794
Step 94: 79794 + 858 = 80652
Step 95: 80652 + 858 = 81510
Step 96: 81510 + 858 = 82368
Step 97: 82368 + 858 = 83226
Step 98: 83226 + 858 = 84084
Step 99: 84084 + 858 = 84942
Step 100: 84942 + 858 = 85800
Step 101: 85800 + 858 = 86658
Step 102: 86658 + 858 = 87516
Step 103: 87516 + 858 = 88374
Step 104: 88374 + 858 = 89232
Step 105: 89232 + 858 = 90090
Step 106: 90090 + 858 = 90948
Step 107: 90948 + 858 = 91806
Step 108: 91806 + 858 = 92664
Step 109: 92664 + 858 = 93522
Step 110: 93522 + 858 = 94380
Step 111: 94380 + 858 = 95238
Step 112: 95238 + 858 = 96096
Step 113: 96096 + 858 = 96954
Step 114: 96954 + 858 = 97812
Step 115: 97812 + 858 = 98670
Step 116: 98670 + 858 = 99528
Step 117: 99528 + 858 = 100386
Step 118: 100386 + 858 = 101244
Step 119: 101244 + 858 = 102102
Step 120: 102102 + 858 = 102960
Step 121: 102960 + 858 = 103818
Step 122: 103818 + 858 = 104676
Step 123: 104676 + 858 = 105534
Step 124: 105534 + 858 = 106392
Step 125: 106392 + 858 = 107250
Step 126: 107250 + 858 = 108108
Step 127: 108108 + 858 = 108966
Step 128: 108966 + 858 = 109824
Step 129: 109824 + 858 = 110682
Step 130: 110682 + 858 = 111540
Step 131: 111540 + 858 = 112398
Step 132: 112398 + 858 = 113256
Step 133: 113256 + 858 = 114114
Step 134: 114114 + 858 = 114972
Step 135: 114972 + 858 = 115830
Step 136: 115830 + 858 = 116688
Step 137: 116688 + 858 = 117546
Step 138: 117546 + 858 = 118404

So, 858*138 = 118404