OK, let's work through this together. We're starting with 429 and we're going to multiply it by 89, which means we add 429 to itself 89 times.
Step 1: 0 + 429 = 429
Step 2: 429 + 429 = 858
Step 3: 858 + 429 = 1287
Step 4: 1287 + 429 = 1716
Step 5: 1716 + 429 = 2145
Step 6: 2145 + 429 = 2574
Step 7: 2574 + 429 = 3003
Step 8: 3003 + 429 = 3432
Step 9: 3432 + 429 = 3861
Step 10: 3861 + 429 = 4290
Step 11: 4290 + 429 = 4719
Step 12: 4719 + 429 = 5148
Step 13: 5148 + 429 = 5577
Step 14: 5577 + 429 = 6006
Step 15: 6006 + 429 = 6435
Step 16: 6435 + 429 = 6864
Step 17: 6864 + 429 = 7293
Step 18: 7293 + 429 = 7722
Step 19: 7722 + 429 = 8151
Step 20: 8151 + 429 = 8580
Step 21: 8580 + 429 = 9009
Step 22: 9009 + 429 = 9438
Step 23: 9438 + 429 = 9867
Step 24: 9867 + 429 = 10296
Step 25: 10296 + 429 = 10725
Step 26: 10725 + 429 = 11154
Step 27: 11154 + 429 = 11583
Step 28: 11583 + 429 = 12012
Step 29: 12012 + 429 = 12441
Step 30: 12441 + 429 = 12870
Step 31: 12870 + 429 = 13299
Step 32: 13299 + 429 = 13728
Step 33: 13728 + 429 = 14157
Step 34: 14157 + 429 = 14586
Step 35: 14586 + 429 = 15015
Step 36: 15015 + 429 = 15444
Step 37: 15444 + 429 = 15873
Step 38: 15873 + 429 = 16302
Step 39: 16302 + 429 = 16731
Step 40: 16731 + 429 = 17160
Step 41: 17160 + 429 = 17589
Step 42: 17589 + 429 = 18018
Step 43: 18018 + 429 = 18447
Step 44: 18447 + 429 = 18876
Step 45: 18876 + 429 = 19305
Step 46: 19305 + 429 = 19734
Step 47: 19734 + 429 = 20163
Step 48: 20163 + 429 = 20592
Step 49: 20592 + 429 = 21021
Step 50: 21021 + 429 = 21450
Step 51: 21450 + 429 = 21879
Step 52: 21879 + 429 = 22308
Step 53: 22308 + 429 = 22737
Step 54: 22737 + 429 = 23166
Step 55: 23166 + 429 = 23595
Step 56: 23595 + 429 = 24024
Step 57: 24024 + 429 = 24453
Step 58: 24453 + 429 = 24882
Step 59: 24882 + 429 = 25311
Step 60: 25311 + 429 = 25740
Step 61: 25740 + 429 = 26169
Step 62: 26169 + 429 = 26598
Step 63: 26598 + 429 = 27027
Step 64: 27027 + 429 = 27456
Step 65: 27456 + 429 = 27885
Step 66: 27885 + 429 = 28314
Step 67: 28314 + 429 = 28743
Step 68: 28743 + 429 = 29172
Step 69: 29172 + 429 = 29601
Step 70: 29601 + 429 = 30030
Step 71: 30030 + 429 = 30459
Step 72: 30459 + 429 = 30888
Step 73: 30888 + 429 = 31317
Step 74: 31317 + 429 = 31746
Step 75: 31746 + 429 = 32175
Step 76: 32175 + 429 = 32604
Step 77: 32604 + 429 = 33033
Step 78: 33033 + 429 = 33462
Step 79: 33462 + 429 = 33891
Step 80: 33891 + 429 = 34320
Step 81: 34320 + 429 = 34749
Step 82: 34749 + 429 = 35178
Step 83: 35178 + 429 = 35607
Step 84: 35607 + 429 = 36036
Step 85: 36036 + 429 = 36465
Step 86: 36465 + 429 = 36894
Step 87: 36894 + 429 = 37323
Step 88: 37323 + 429 = 37752
Step 89: 37752 + 429 = 38181

So, 429*89 = 38181