Alright, let's solve this math problem step by step. First, we have the number 141. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 145. So, we're going to take the number 141 and add it to itself 145 times.
Step 1: 0 + 141 = 141
Step 2: 141 + 141 = 282
Step 3: 282 + 141 = 423
Step 4: 423 + 141 = 564
Step 5: 564 + 141 = 705
Step 6: 705 + 141 = 846
Step 7: 846 + 141 = 987
Step 8: 987 + 141 = 1128
Step 9: 1128 + 141 = 1269
Step 10: 1269 + 141 = 1410
Step 11: 1410 + 141 = 1551
Step 12: 1551 + 141 = 1692
Step 13: 1692 + 141 = 1833
Step 14: 1833 + 141 = 1974
Step 15: 1974 + 141 = 2115
Step 16: 2115 + 141 = 2256
Step 17: 2256 + 141 = 2397
Step 18: 2397 + 141 = 2538
Step 19: 2538 + 141 = 2679
Step 20: 2679 + 141 = 2820
Step 21: 2820 + 141 = 2961
Step 22: 2961 + 141 = 3102
Step 23: 3102 + 141 = 3243
Step 24: 3243 + 141 = 3384
Step 25: 3384 + 141 = 3525
Step 26: 3525 + 141 = 3666
Step 27: 3666 + 141 = 3807
Step 28: 3807 + 141 = 3948
Step 29: 3948 + 141 = 4089
Step 30: 4089 + 141 = 4230
Step 31: 4230 + 141 = 4371
Step 32: 4371 + 141 = 4512
Step 33: 4512 + 141 = 4653
Step 34: 4653 + 141 = 4794
Step 35: 4794 + 141 = 4935
Step 36: 4935 + 141 = 5076
Step 37: 5076 + 141 = 5217
Step 38: 5217 + 141 = 5358
Step 39: 5358 + 141 = 5499
Step 40: 5499 + 141 = 5640
Step 41: 5640 + 141 = 5781
Step 42: 5781 + 141 = 5922
Step 43: 5922 + 141 = 6063
Step 44: 6063 + 141 = 6204
Step 45: 6204 + 141 = 6345
Step 46: 6345 + 141 = 6486
Step 47: 6486 + 141 = 6627
Step 48: 6627 + 141 = 6768
Step 49: 6768 + 141 = 6909
Step 50: 6909 + 141 = 7050
Step 51: 7050 + 141 = 7191
Step 52: 7191 + 141 = 7332
Step 53: 7332 + 141 = 7473
Step 54: 7473 + 141 = 7614
Step 55: 7614 + 141 = 7755
Step 56: 7755 + 141 = 7896
Step 57: 7896 + 141 = 8037
Step 58: 8037 + 141 = 8178
Step 59: 8178 + 141 = 8319
Step 60: 8319 + 141 = 8460
Step 61: 8460 + 141 = 8601
Step 62: 8601 + 141 = 8742
Step 63: 8742 + 141 = 8883
Step 64: 8883 + 141 = 9024
Step 65: 9024 + 141 = 9165
Step 66: 9165 + 141 = 9306
Step 67: 9306 + 141 = 9447
Step 68: 9447 + 141 = 9588
Step 69: 9588 + 141 = 9729
Step 70: 9729 + 141 = 9870
Step 71: 9870 + 141 = 10011
Step 72: 10011 + 141 = 10152
Step 73: 10152 + 141 = 10293
Step 74: 10293 + 141 = 10434
Step 75: 10434 + 141 = 10575
Step 76: 10575 + 141 = 10716
Step 77: 10716 + 141 = 10857
Step 78: 10857 + 141 = 10998
Step 79: 10998 + 141 = 11139
Step 80: 11139 + 141 = 11280
Step 81: 11280 + 141 = 11421
Step 82: 11421 + 141 = 11562
Step 83: 11562 + 141 = 11703
Step 84: 11703 + 141 = 11844
Step 85: 11844 + 141 = 11985
Step 86: 11985 + 141 = 12126
Step 87: 12126 + 141 = 12267
Step 88: 12267 + 141 = 12408
Step 89: 12408 + 141 = 12549
Step 90: 12549 + 141 = 12690
Step 91: 12690 + 141 = 12831
Step 92: 12831 + 141 = 12972
Step 93: 12972 + 141 = 13113
Step 94: 13113 + 141 = 13254
Step 95: 13254 + 141 = 13395
Step 96: 13395 + 141 = 13536
Step 97: 13536 + 141 = 13677
Step 98: 13677 + 141 = 13818
Step 99: 13818 + 141 = 13959
Step 100: 13959 + 141 = 14100
Step 101: 14100 + 141 = 14241
Step 102: 14241 + 141 = 14382
Step 103: 14382 + 141 = 14523
Step 104: 14523 + 141 = 14664
Step 105: 14664 + 141 = 14805
Step 106: 14805 + 141 = 14946
Step 107: 14946 + 141 = 15087
Step 108: 15087 + 141 = 15228
Step 109: 15228 + 141 = 15369
Step 110: 15369 + 141 = 15510
Step 111: 15510 + 141 = 15651
Step 112: 15651 + 141 = 15792
Step 113: 15792 + 141 = 15933
Step 114: 15933 + 141 = 16074
Step 115: 16074 + 141 = 16215
Step 116: 16215 + 141 = 16356
Step 117: 16356 + 141 = 16497
Step 118: 16497 + 141 = 16638
Step 119: 16638 + 141 = 16779
Step 120: 16779 + 141 = 16920
Step 121: 16920 + 141 = 17061
Step 122: 17061 + 141 = 17202
Step 123: 17202 + 141 = 17343
Step 124: 17343 + 141 = 17484
Step 125: 17484 + 141 = 17625
Step 126: 17625 + 141 = 17766
Step 127: 17766 + 141 = 17907
Step 128: 17907 + 141 = 18048
Step 129: 18048 + 141 = 18189
Step 130: 18189 + 141 = 18330
Step 131: 18330 + 141 = 18471
Step 132: 18471 + 141 = 18612
Step 133: 18612 + 141 = 18753
Step 134: 18753 + 141 = 18894
Step 135: 18894 + 141 = 19035
Step 136: 19035 + 141 = 19176
Step 137: 19176 + 141 = 19317
Step 138: 19317 + 141 = 19458
Step 139: 19458 + 141 = 19599
Step 140: 19599 + 141 = 19740
Step 141: 19740 + 141 = 19881
Step 142: 19881 + 141 = 20022
Step 143: 20022 + 141 = 20163
Step 144: 20163 + 141 = 20304
Step 145: 20304 + 141 = 20445

So, 141*145 = 20445