Alright, let's solve this math problem step by step. First, we have the number 154. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 142. So, we're going to take the number 154 and add it to itself 142 times.
Step 1: 0 + 154 = 154
Step 2: 154 + 154 = 308
Step 3: 308 + 154 = 462
Step 4: 462 + 154 = 616
Step 5: 616 + 154 = 770
Step 6: 770 + 154 = 924
Step 7: 924 + 154 = 1078
Step 8: 1078 + 154 = 1232
Step 9: 1232 + 154 = 1386
Step 10: 1386 + 154 = 1540
Step 11: 1540 + 154 = 1694
Step 12: 1694 + 154 = 1848
Step 13: 1848 + 154 = 2002
Step 14: 2002 + 154 = 2156
Step 15: 2156 + 154 = 2310
Step 16: 2310 + 154 = 2464
Step 17: 2464 + 154 = 2618
Step 18: 2618 + 154 = 2772
Step 19: 2772 + 154 = 2926
Step 20: 2926 + 154 = 3080
Step 21: 3080 + 154 = 3234
Step 22: 3234 + 154 = 3388
Step 23: 3388 + 154 = 3542
Step 24: 3542 + 154 = 3696
Step 25: 3696 + 154 = 3850
Step 26: 3850 + 154 = 4004
Step 27: 4004 + 154 = 4158
Step 28: 4158 + 154 = 4312
Step 29: 4312 + 154 = 4466
Step 30: 4466 + 154 = 4620
Step 31: 4620 + 154 = 4774
Step 32: 4774 + 154 = 4928
Step 33: 4928 + 154 = 5082
Step 34: 5082 + 154 = 5236
Step 35: 5236 + 154 = 5390
Step 36: 5390 + 154 = 5544
Step 37: 5544 + 154 = 5698
Step 38: 5698 + 154 = 5852
Step 39: 5852 + 154 = 6006
Step 40: 6006 + 154 = 6160
Step 41: 6160 + 154 = 6314
Step 42: 6314 + 154 = 6468
Step 43: 6468 + 154 = 6622
Step 44: 6622 + 154 = 6776
Step 45: 6776 + 154 = 6930
Step 46: 6930 + 154 = 7084
Step 47: 7084 + 154 = 7238
Step 48: 7238 + 154 = 7392
Step 49: 7392 + 154 = 7546
Step 50: 7546 + 154 = 7700
Step 51: 7700 + 154 = 7854
Step 52: 7854 + 154 = 8008
Step 53: 8008 + 154 = 8162
Step 54: 8162 + 154 = 8316
Step 55: 8316 + 154 = 8470
Step 56: 8470 + 154 = 8624
Step 57: 8624 + 154 = 8778
Step 58: 8778 + 154 = 8932
Step 59: 8932 + 154 = 9086
Step 60: 9086 + 154 = 9240
Step 61: 9240 + 154 = 9394
Step 62: 9394 + 154 = 9548
Step 63: 9548 + 154 = 9702
Step 64: 9702 + 154 = 9856
Step 65: 9856 + 154 = 10010
Step 66: 10010 + 154 = 10164
Step 67: 10164 + 154 = 10318
Step 68: 10318 + 154 = 10472
Step 69: 10472 + 154 = 10626
Step 70: 10626 + 154 = 10780
Step 71: 10780 + 154 = 10934
Step 72: 10934 + 154 = 11088
Step 73: 11088 + 154 = 11242
Step 74: 11242 + 154 = 11396
Step 75: 11396 + 154 = 11550
Step 76: 11550 + 154 = 11704
Step 77: 11704 + 154 = 11858
Step 78: 11858 + 154 = 12012
Step 79: 12012 + 154 = 12166
Step 80: 12166 + 154 = 12320
Step 81: 12320 + 154 = 12474
Step 82: 12474 + 154 = 12628
Step 83: 12628 + 154 = 12782
Step 84: 12782 + 154 = 12936
Step 85: 12936 + 154 = 13090
Step 86: 13090 + 154 = 13244
Step 87: 13244 + 154 = 13398
Step 88: 13398 + 154 = 13552
Step 89: 13552 + 154 = 13706
Step 90: 13706 + 154 = 13860
Step 91: 13860 + 154 = 14014
Step 92: 14014 + 154 = 14168
Step 93: 14168 + 154 = 14322
Step 94: 14322 + 154 = 14476
Step 95: 14476 + 154 = 14630
Step 96: 14630 + 154 = 14784
Step 97: 14784 + 154 = 14938
Step 98: 14938 + 154 = 15092
Step 99: 15092 + 154 = 15246
Step 100: 15246 + 154 = 15400
Step 101: 15400 + 154 = 15554
Step 102: 15554 + 154 = 15708
Step 103: 15708 + 154 = 15862
Step 104: 15862 + 154 = 16016
Step 105: 16016 + 154 = 16170
Step 106: 16170 + 154 = 16324
Step 107: 16324 + 154 = 16478
Step 108: 16478 + 154 = 16632
Step 109: 16632 + 154 = 16786
Step 110: 16786 + 154 = 16940
Step 111: 16940 + 154 = 17094
Step 112: 17094 + 154 = 17248
Step 113: 17248 + 154 = 17402
Step 114: 17402 + 154 = 17556
Step 115: 17556 + 154 = 17710
Step 116: 17710 + 154 = 17864
Step 117: 17864 + 154 = 18018
Step 118: 18018 + 154 = 18172
Step 119: 18172 + 154 = 18326
Step 120: 18326 + 154 = 18480
Step 121: 18480 + 154 = 18634
Step 122: 18634 + 154 = 18788
Step 123: 18788 + 154 = 18942
Step 124: 18942 + 154 = 19096
Step 125: 19096 + 154 = 19250
Step 126: 19250 + 154 = 19404
Step 127: 19404 + 154 = 19558
Step 128: 19558 + 154 = 19712
Step 129: 19712 + 154 = 19866
Step 130: 19866 + 154 = 20020
Step 131: 20020 + 154 = 20174
Step 132: 20174 + 154 = 20328
Step 133: 20328 + 154 = 20482
Step 134: 20482 + 154 = 20636
Step 135: 20636 + 154 = 20790
Step 136: 20790 + 154 = 20944
Step 137: 20944 + 154 = 21098
Step 138: 21098 + 154 = 21252
Step 139: 21252 + 154 = 21406
Step 140: 21406 + 154 = 21560
Step 141: 21560 + 154 = 21714
Step 142: 21714 + 154 = 21868

So, 154*142 = 21868