Alright, let's solve this math problem step by step. First, we have the number 258. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 156. So, we're going to take the number 258 and add it to itself 156 times.
Step 1: 0 + 258 = 258
Step 2: 258 + 258 = 516
Step 3: 516 + 258 = 774
Step 4: 774 + 258 = 1032
Step 5: 1032 + 258 = 1290
Step 6: 1290 + 258 = 1548
Step 7: 1548 + 258 = 1806
Step 8: 1806 + 258 = 2064
Step 9: 2064 + 258 = 2322
Step 10: 2322 + 258 = 2580
Step 11: 2580 + 258 = 2838
Step 12: 2838 + 258 = 3096
Step 13: 3096 + 258 = 3354
Step 14: 3354 + 258 = 3612
Step 15: 3612 + 258 = 3870
Step 16: 3870 + 258 = 4128
Step 17: 4128 + 258 = 4386
Step 18: 4386 + 258 = 4644
Step 19: 4644 + 258 = 4902
Step 20: 4902 + 258 = 5160
Step 21: 5160 + 258 = 5418
Step 22: 5418 + 258 = 5676
Step 23: 5676 + 258 = 5934
Step 24: 5934 + 258 = 6192
Step 25: 6192 + 258 = 6450
Step 26: 6450 + 258 = 6708
Step 27: 6708 + 258 = 6966
Step 28: 6966 + 258 = 7224
Step 29: 7224 + 258 = 7482
Step 30: 7482 + 258 = 7740
Step 31: 7740 + 258 = 7998
Step 32: 7998 + 258 = 8256
Step 33: 8256 + 258 = 8514
Step 34: 8514 + 258 = 8772
Step 35: 8772 + 258 = 9030
Step 36: 9030 + 258 = 9288
Step 37: 9288 + 258 = 9546
Step 38: 9546 + 258 = 9804
Step 39: 9804 + 258 = 10062
Step 40: 10062 + 258 = 10320
Step 41: 10320 + 258 = 10578
Step 42: 10578 + 258 = 10836
Step 43: 10836 + 258 = 11094
Step 44: 11094 + 258 = 11352
Step 45: 11352 + 258 = 11610
Step 46: 11610 + 258 = 11868
Step 47: 11868 + 258 = 12126
Step 48: 12126 + 258 = 12384
Step 49: 12384 + 258 = 12642
Step 50: 12642 + 258 = 12900
Step 51: 12900 + 258 = 13158
Step 52: 13158 + 258 = 13416
Step 53: 13416 + 258 = 13674
Step 54: 13674 + 258 = 13932
Step 55: 13932 + 258 = 14190
Step 56: 14190 + 258 = 14448
Step 57: 14448 + 258 = 14706
Step 58: 14706 + 258 = 14964
Step 59: 14964 + 258 = 15222
Step 60: 15222 + 258 = 15480
Step 61: 15480 + 258 = 15738
Step 62: 15738 + 258 = 15996
Step 63: 15996 + 258 = 16254
Step 64: 16254 + 258 = 16512
Step 65: 16512 + 258 = 16770
Step 66: 16770 + 258 = 17028
Step 67: 17028 + 258 = 17286
Step 68: 17286 + 258 = 17544
Step 69: 17544 + 258 = 17802
Step 70: 17802 + 258 = 18060
Step 71: 18060 + 258 = 18318
Step 72: 18318 + 258 = 18576
Step 73: 18576 + 258 = 18834
Step 74: 18834 + 258 = 19092
Step 75: 19092 + 258 = 19350
Step 76: 19350 + 258 = 19608
Step 77: 19608 + 258 = 19866
Step 78: 19866 + 258 = 20124
Step 79: 20124 + 258 = 20382
Step 80: 20382 + 258 = 20640
Step 81: 20640 + 258 = 20898
Step 82: 20898 + 258 = 21156
Step 83: 21156 + 258 = 21414
Step 84: 21414 + 258 = 21672
Step 85: 21672 + 258 = 21930
Step 86: 21930 + 258 = 22188
Step 87: 22188 + 258 = 22446
Step 88: 22446 + 258 = 22704
Step 89: 22704 + 258 = 22962
Step 90: 22962 + 258 = 23220
Step 91: 23220 + 258 = 23478
Step 92: 23478 + 258 = 23736
Step 93: 23736 + 258 = 23994
Step 94: 23994 + 258 = 24252
Step 95: 24252 + 258 = 24510
Step 96: 24510 + 258 = 24768
Step 97: 24768 + 258 = 25026
Step 98: 25026 + 258 = 25284
Step 99: 25284 + 258 = 25542
Step 100: 25542 + 258 = 25800
Step 101: 25800 + 258 = 26058
Step 102: 26058 + 258 = 26316
Step 103: 26316 + 258 = 26574
Step 104: 26574 + 258 = 26832
Step 105: 26832 + 258 = 27090
Step 106: 27090 + 258 = 27348
Step 107: 27348 + 258 = 27606
Step 108: 27606 + 258 = 27864
Step 109: 27864 + 258 = 28122
Step 110: 28122 + 258 = 28380
Step 111: 28380 + 258 = 28638
Step 112: 28638 + 258 = 28896
Step 113: 28896 + 258 = 29154
Step 114: 29154 + 258 = 29412
Step 115: 29412 + 258 = 29670
Step 116: 29670 + 258 = 29928
Step 117: 29928 + 258 = 30186
Step 118: 30186 + 258 = 30444
Step 119: 30444 + 258 = 30702
Step 120: 30702 + 258 = 30960
Step 121: 30960 + 258 = 31218
Step 122: 31218 + 258 = 31476
Step 123: 31476 + 258 = 31734
Step 124: 31734 + 258 = 31992
Step 125: 31992 + 258 = 32250
Step 126: 32250 + 258 = 32508
Step 127: 32508 + 258 = 32766
Step 128: 32766 + 258 = 33024
Step 129: 33024 + 258 = 33282
Step 130: 33282 + 258 = 33540
Step 131: 33540 + 258 = 33798
Step 132: 33798 + 258 = 34056
Step 133: 34056 + 258 = 34314
Step 134: 34314 + 258 = 34572
Step 135: 34572 + 258 = 34830
Step 136: 34830 + 258 = 35088
Step 137: 35088 + 258 = 35346
Step 138: 35346 + 258 = 35604
Step 139: 35604 + 258 = 35862
Step 140: 35862 + 258 = 36120
Step 141: 36120 + 258 = 36378
Step 142: 36378 + 258 = 36636
Step 143: 36636 + 258 = 36894
Step 144: 36894 + 258 = 37152
Step 145: 37152 + 258 = 37410
Step 146: 37410 + 258 = 37668
Step 147: 37668 + 258 = 37926
Step 148: 37926 + 258 = 38184
Step 149: 38184 + 258 = 38442
Step 150: 38442 + 258 = 38700
Step 151: 38700 + 258 = 38958
Step 152: 38958 + 258 = 39216
Step 153: 39216 + 258 = 39474
Step 154: 39474 + 258 = 39732
Step 155: 39732 + 258 = 39990
Step 156: 39990 + 258 = 40248

So, 258*156 = 40248