Alright, let's solve this math problem step by step. First, we have the number 99. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 144. So, we're going to take the number 99 and add it to itself 144 times.
Step 1: 0 + 99 = 99
Step 2: 99 + 99 = 198
Step 3: 198 + 99 = 297
Step 4: 297 + 99 = 396
Step 5: 396 + 99 = 495
Step 6: 495 + 99 = 594
Step 7: 594 + 99 = 693
Step 8: 693 + 99 = 792
Step 9: 792 + 99 = 891
Step 10: 891 + 99 = 990
Step 11: 990 + 99 = 1089
Step 12: 1089 + 99 = 1188
Step 13: 1188 + 99 = 1287
Step 14: 1287 + 99 = 1386
Step 15: 1386 + 99 = 1485
Step 16: 1485 + 99 = 1584
Step 17: 1584 + 99 = 1683
Step 18: 1683 + 99 = 1782
Step 19: 1782 + 99 = 1881
Step 20: 1881 + 99 = 1980
Step 21: 1980 + 99 = 2079
Step 22: 2079 + 99 = 2178
Step 23: 2178 + 99 = 2277
Step 24: 2277 + 99 = 2376
Step 25: 2376 + 99 = 2475
Step 26: 2475 + 99 = 2574
Step 27: 2574 + 99 = 2673
Step 28: 2673 + 99 = 2772
Step 29: 2772 + 99 = 2871
Step 30: 2871 + 99 = 2970
Step 31: 2970 + 99 = 3069
Step 32: 3069 + 99 = 3168
Step 33: 3168 + 99 = 3267
Step 34: 3267 + 99 = 3366
Step 35: 3366 + 99 = 3465
Step 36: 3465 + 99 = 3564
Step 37: 3564 + 99 = 3663
Step 38: 3663 + 99 = 3762
Step 39: 3762 + 99 = 3861
Step 40: 3861 + 99 = 3960
Step 41: 3960 + 99 = 4059
Step 42: 4059 + 99 = 4158
Step 43: 4158 + 99 = 4257
Step 44: 4257 + 99 = 4356
Step 45: 4356 + 99 = 4455
Step 46: 4455 + 99 = 4554
Step 47: 4554 + 99 = 4653
Step 48: 4653 + 99 = 4752
Step 49: 4752 + 99 = 4851
Step 50: 4851 + 99 = 4950
Step 51: 4950 + 99 = 5049
Step 52: 5049 + 99 = 5148
Step 53: 5148 + 99 = 5247
Step 54: 5247 + 99 = 5346
Step 55: 5346 + 99 = 5445
Step 56: 5445 + 99 = 5544
Step 57: 5544 + 99 = 5643
Step 58: 5643 + 99 = 5742
Step 59: 5742 + 99 = 5841
Step 60: 5841 + 99 = 5940
Step 61: 5940 + 99 = 6039
Step 62: 6039 + 99 = 6138
Step 63: 6138 + 99 = 6237
Step 64: 6237 + 99 = 6336
Step 65: 6336 + 99 = 6435
Step 66: 6435 + 99 = 6534
Step 67: 6534 + 99 = 6633
Step 68: 6633 + 99 = 6732
Step 69: 6732 + 99 = 6831
Step 70: 6831 + 99 = 6930
Step 71: 6930 + 99 = 7029
Step 72: 7029 + 99 = 7128
Step 73: 7128 + 99 = 7227
Step 74: 7227 + 99 = 7326
Step 75: 7326 + 99 = 7425
Step 76: 7425 + 99 = 7524
Step 77: 7524 + 99 = 7623
Step 78: 7623 + 99 = 7722
Step 79: 7722 + 99 = 7821
Step 80: 7821 + 99 = 7920
Step 81: 7920 + 99 = 8019
Step 82: 8019 + 99 = 8118
Step 83: 8118 + 99 = 8217
Step 84: 8217 + 99 = 8316
Step 85: 8316 + 99 = 8415
Step 86: 8415 + 99 = 8514
Step 87: 8514 + 99 = 8613
Step 88: 8613 + 99 = 8712
Step 89: 8712 + 99 = 8811
Step 90: 8811 + 99 = 8910
Step 91: 8910 + 99 = 9009
Step 92: 9009 + 99 = 9108
Step 93: 9108 + 99 = 9207
Step 94: 9207 + 99 = 9306
Step 95: 9306 + 99 = 9405
Step 96: 9405 + 99 = 9504
Step 97: 9504 + 99 = 9603
Step 98: 9603 + 99 = 9702
Step 99: 9702 + 99 = 9801
Step 100: 9801 + 99 = 9900
Step 101: 9900 + 99 = 9999
Step 102: 9999 + 99 = 10098
Step 103: 10098 + 99 = 10197
Step 104: 10197 + 99 = 10296
Step 105: 10296 + 99 = 10395
Step 106: 10395 + 99 = 10494
Step 107: 10494 + 99 = 10593
Step 108: 10593 + 99 = 10692
Step 109: 10692 + 99 = 10791
Step 110: 10791 + 99 = 10890
Step 111: 10890 + 99 = 10989
Step 112: 10989 + 99 = 11088
Step 113: 11088 + 99 = 11187
Step 114: 11187 + 99 = 11286
Step 115: 11286 + 99 = 11385
Step 116: 11385 + 99 = 11484
Step 117: 11484 + 99 = 11583
Step 118: 11583 + 99 = 11682
Step 119: 11682 + 99 = 11781
Step 120: 11781 + 99 = 11880
Step 121: 11880 + 99 = 11979
Step 122: 11979 + 99 = 12078
Step 123: 12078 + 99 = 12177
Step 124: 12177 + 99 = 12276
Step 125: 12276 + 99 = 12375
Step 126: 12375 + 99 = 12474
Step 127: 12474 + 99 = 12573
Step 128: 12573 + 99 = 12672
Step 129: 12672 + 99 = 12771
Step 130: 12771 + 99 = 12870
Step 131: 12870 + 99 = 12969
Step 132: 12969 + 99 = 13068
Step 133: 13068 + 99 = 13167
Step 134: 13167 + 99 = 13266
Step 135: 13266 + 99 = 13365
Step 136: 13365 + 99 = 13464
Step 137: 13464 + 99 = 13563
Step 138: 13563 + 99 = 13662
Step 139: 13662 + 99 = 13761
Step 140: 13761 + 99 = 13860
Step 141: 13860 + 99 = 13959
Step 142: 13959 + 99 = 14058
Step 143: 14058 + 99 = 14157
Step 144: 14157 + 99 = 14256

So, 99*144 = 14256