Alright, let's solve this math problem step by step. First, we have the number 149. 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 149 and add it to itself 142 times.
Step 1: 0 + 149 = 149
Step 2: 149 + 149 = 298
Step 3: 298 + 149 = 447
Step 4: 447 + 149 = 596
Step 5: 596 + 149 = 745
Step 6: 745 + 149 = 894
Step 7: 894 + 149 = 1043
Step 8: 1043 + 149 = 1192
Step 9: 1192 + 149 = 1341
Step 10: 1341 + 149 = 1490
Step 11: 1490 + 149 = 1639
Step 12: 1639 + 149 = 1788
Step 13: 1788 + 149 = 1937
Step 14: 1937 + 149 = 2086
Step 15: 2086 + 149 = 2235
Step 16: 2235 + 149 = 2384
Step 17: 2384 + 149 = 2533
Step 18: 2533 + 149 = 2682
Step 19: 2682 + 149 = 2831
Step 20: 2831 + 149 = 2980
Step 21: 2980 + 149 = 3129
Step 22: 3129 + 149 = 3278
Step 23: 3278 + 149 = 3427
Step 24: 3427 + 149 = 3576
Step 25: 3576 + 149 = 3725
Step 26: 3725 + 149 = 3874
Step 27: 3874 + 149 = 4023
Step 28: 4023 + 149 = 4172
Step 29: 4172 + 149 = 4321
Step 30: 4321 + 149 = 4470
Step 31: 4470 + 149 = 4619
Step 32: 4619 + 149 = 4768
Step 33: 4768 + 149 = 4917
Step 34: 4917 + 149 = 5066
Step 35: 5066 + 149 = 5215
Step 36: 5215 + 149 = 5364
Step 37: 5364 + 149 = 5513
Step 38: 5513 + 149 = 5662
Step 39: 5662 + 149 = 5811
Step 40: 5811 + 149 = 5960
Step 41: 5960 + 149 = 6109
Step 42: 6109 + 149 = 6258
Step 43: 6258 + 149 = 6407
Step 44: 6407 + 149 = 6556
Step 45: 6556 + 149 = 6705
Step 46: 6705 + 149 = 6854
Step 47: 6854 + 149 = 7003
Step 48: 7003 + 149 = 7152
Step 49: 7152 + 149 = 7301
Step 50: 7301 + 149 = 7450
Step 51: 7450 + 149 = 7599
Step 52: 7599 + 149 = 7748
Step 53: 7748 + 149 = 7897
Step 54: 7897 + 149 = 8046
Step 55: 8046 + 149 = 8195
Step 56: 8195 + 149 = 8344
Step 57: 8344 + 149 = 8493
Step 58: 8493 + 149 = 8642
Step 59: 8642 + 149 = 8791
Step 60: 8791 + 149 = 8940
Step 61: 8940 + 149 = 9089
Step 62: 9089 + 149 = 9238
Step 63: 9238 + 149 = 9387
Step 64: 9387 + 149 = 9536
Step 65: 9536 + 149 = 9685
Step 66: 9685 + 149 = 9834
Step 67: 9834 + 149 = 9983
Step 68: 9983 + 149 = 10132
Step 69: 10132 + 149 = 10281
Step 70: 10281 + 149 = 10430
Step 71: 10430 + 149 = 10579
Step 72: 10579 + 149 = 10728
Step 73: 10728 + 149 = 10877
Step 74: 10877 + 149 = 11026
Step 75: 11026 + 149 = 11175
Step 76: 11175 + 149 = 11324
Step 77: 11324 + 149 = 11473
Step 78: 11473 + 149 = 11622
Step 79: 11622 + 149 = 11771
Step 80: 11771 + 149 = 11920
Step 81: 11920 + 149 = 12069
Step 82: 12069 + 149 = 12218
Step 83: 12218 + 149 = 12367
Step 84: 12367 + 149 = 12516
Step 85: 12516 + 149 = 12665
Step 86: 12665 + 149 = 12814
Step 87: 12814 + 149 = 12963
Step 88: 12963 + 149 = 13112
Step 89: 13112 + 149 = 13261
Step 90: 13261 + 149 = 13410
Step 91: 13410 + 149 = 13559
Step 92: 13559 + 149 = 13708
Step 93: 13708 + 149 = 13857
Step 94: 13857 + 149 = 14006
Step 95: 14006 + 149 = 14155
Step 96: 14155 + 149 = 14304
Step 97: 14304 + 149 = 14453
Step 98: 14453 + 149 = 14602
Step 99: 14602 + 149 = 14751
Step 100: 14751 + 149 = 14900
Step 101: 14900 + 149 = 15049
Step 102: 15049 + 149 = 15198
Step 103: 15198 + 149 = 15347
Step 104: 15347 + 149 = 15496
Step 105: 15496 + 149 = 15645
Step 106: 15645 + 149 = 15794
Step 107: 15794 + 149 = 15943
Step 108: 15943 + 149 = 16092
Step 109: 16092 + 149 = 16241
Step 110: 16241 + 149 = 16390
Step 111: 16390 + 149 = 16539
Step 112: 16539 + 149 = 16688
Step 113: 16688 + 149 = 16837
Step 114: 16837 + 149 = 16986
Step 115: 16986 + 149 = 17135
Step 116: 17135 + 149 = 17284
Step 117: 17284 + 149 = 17433
Step 118: 17433 + 149 = 17582
Step 119: 17582 + 149 = 17731
Step 120: 17731 + 149 = 17880
Step 121: 17880 + 149 = 18029
Step 122: 18029 + 149 = 18178
Step 123: 18178 + 149 = 18327
Step 124: 18327 + 149 = 18476
Step 125: 18476 + 149 = 18625
Step 126: 18625 + 149 = 18774
Step 127: 18774 + 149 = 18923
Step 128: 18923 + 149 = 19072
Step 129: 19072 + 149 = 19221
Step 130: 19221 + 149 = 19370
Step 131: 19370 + 149 = 19519
Step 132: 19519 + 149 = 19668
Step 133: 19668 + 149 = 19817
Step 134: 19817 + 149 = 19966
Step 135: 19966 + 149 = 20115
Step 136: 20115 + 149 = 20264
Step 137: 20264 + 149 = 20413
Step 138: 20413 + 149 = 20562
Step 139: 20562 + 149 = 20711
Step 140: 20711 + 149 = 20860
Step 141: 20860 + 149 = 21009
Step 142: 21009 + 149 = 21158

So, 149*142 = 21158