Alright, let's solve this math problem step by step. First, we have the number 431. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 129. So, we're going to take the number 431 and add it to itself 129 times.
Step 1: 0 + 431 = 431
Step 2: 431 + 431 = 862
Step 3: 862 + 431 = 1293
Step 4: 1293 + 431 = 1724
Step 5: 1724 + 431 = 2155
Step 6: 2155 + 431 = 2586
Step 7: 2586 + 431 = 3017
Step 8: 3017 + 431 = 3448
Step 9: 3448 + 431 = 3879
Step 10: 3879 + 431 = 4310
Step 11: 4310 + 431 = 4741
Step 12: 4741 + 431 = 5172
Step 13: 5172 + 431 = 5603
Step 14: 5603 + 431 = 6034
Step 15: 6034 + 431 = 6465
Step 16: 6465 + 431 = 6896
Step 17: 6896 + 431 = 7327
Step 18: 7327 + 431 = 7758
Step 19: 7758 + 431 = 8189
Step 20: 8189 + 431 = 8620
Step 21: 8620 + 431 = 9051
Step 22: 9051 + 431 = 9482
Step 23: 9482 + 431 = 9913
Step 24: 9913 + 431 = 10344
Step 25: 10344 + 431 = 10775
Step 26: 10775 + 431 = 11206
Step 27: 11206 + 431 = 11637
Step 28: 11637 + 431 = 12068
Step 29: 12068 + 431 = 12499
Step 30: 12499 + 431 = 12930
Step 31: 12930 + 431 = 13361
Step 32: 13361 + 431 = 13792
Step 33: 13792 + 431 = 14223
Step 34: 14223 + 431 = 14654
Step 35: 14654 + 431 = 15085
Step 36: 15085 + 431 = 15516
Step 37: 15516 + 431 = 15947
Step 38: 15947 + 431 = 16378
Step 39: 16378 + 431 = 16809
Step 40: 16809 + 431 = 17240
Step 41: 17240 + 431 = 17671
Step 42: 17671 + 431 = 18102
Step 43: 18102 + 431 = 18533
Step 44: 18533 + 431 = 18964
Step 45: 18964 + 431 = 19395
Step 46: 19395 + 431 = 19826
Step 47: 19826 + 431 = 20257
Step 48: 20257 + 431 = 20688
Step 49: 20688 + 431 = 21119
Step 50: 21119 + 431 = 21550
Step 51: 21550 + 431 = 21981
Step 52: 21981 + 431 = 22412
Step 53: 22412 + 431 = 22843
Step 54: 22843 + 431 = 23274
Step 55: 23274 + 431 = 23705
Step 56: 23705 + 431 = 24136
Step 57: 24136 + 431 = 24567
Step 58: 24567 + 431 = 24998
Step 59: 24998 + 431 = 25429
Step 60: 25429 + 431 = 25860
Step 61: 25860 + 431 = 26291
Step 62: 26291 + 431 = 26722
Step 63: 26722 + 431 = 27153
Step 64: 27153 + 431 = 27584
Step 65: 27584 + 431 = 28015
Step 66: 28015 + 431 = 28446
Step 67: 28446 + 431 = 28877
Step 68: 28877 + 431 = 29308
Step 69: 29308 + 431 = 29739
Step 70: 29739 + 431 = 30170
Step 71: 30170 + 431 = 30601
Step 72: 30601 + 431 = 31032
Step 73: 31032 + 431 = 31463
Step 74: 31463 + 431 = 31894
Step 75: 31894 + 431 = 32325
Step 76: 32325 + 431 = 32756
Step 77: 32756 + 431 = 33187
Step 78: 33187 + 431 = 33618
Step 79: 33618 + 431 = 34049
Step 80: 34049 + 431 = 34480
Step 81: 34480 + 431 = 34911
Step 82: 34911 + 431 = 35342
Step 83: 35342 + 431 = 35773
Step 84: 35773 + 431 = 36204
Step 85: 36204 + 431 = 36635
Step 86: 36635 + 431 = 37066
Step 87: 37066 + 431 = 37497
Step 88: 37497 + 431 = 37928
Step 89: 37928 + 431 = 38359
Step 90: 38359 + 431 = 38790
Step 91: 38790 + 431 = 39221
Step 92: 39221 + 431 = 39652
Step 93: 39652 + 431 = 40083
Step 94: 40083 + 431 = 40514
Step 95: 40514 + 431 = 40945
Step 96: 40945 + 431 = 41376
Step 97: 41376 + 431 = 41807
Step 98: 41807 + 431 = 42238
Step 99: 42238 + 431 = 42669
Step 100: 42669 + 431 = 43100
Step 101: 43100 + 431 = 43531
Step 102: 43531 + 431 = 43962
Step 103: 43962 + 431 = 44393
Step 104: 44393 + 431 = 44824
Step 105: 44824 + 431 = 45255
Step 106: 45255 + 431 = 45686
Step 107: 45686 + 431 = 46117
Step 108: 46117 + 431 = 46548
Step 109: 46548 + 431 = 46979
Step 110: 46979 + 431 = 47410
Step 111: 47410 + 431 = 47841
Step 112: 47841 + 431 = 48272
Step 113: 48272 + 431 = 48703
Step 114: 48703 + 431 = 49134
Step 115: 49134 + 431 = 49565
Step 116: 49565 + 431 = 49996
Step 117: 49996 + 431 = 50427
Step 118: 50427 + 431 = 50858
Step 119: 50858 + 431 = 51289
Step 120: 51289 + 431 = 51720
Step 121: 51720 + 431 = 52151
Step 122: 52151 + 431 = 52582
Step 123: 52582 + 431 = 53013
Step 124: 53013 + 431 = 53444
Step 125: 53444 + 431 = 53875
Step 126: 53875 + 431 = 54306
Step 127: 54306 + 431 = 54737
Step 128: 54737 + 431 = 55168
Step 129: 55168 + 431 = 55599

So, 431*129 = 55599