Let's roll up our sleeves and solve this. We have 325 and we're going to multiply it by 129, essentially adding 325 to itself 129 times.
Step 1: 0 + 325 = 325
Step 2: 325 + 325 = 650
Step 3: 650 + 325 = 975
Step 4: 975 + 325 = 1300
Step 5: 1300 + 325 = 1625
Step 6: 1625 + 325 = 1950
Step 7: 1950 + 325 = 2275
Step 8: 2275 + 325 = 2600
Step 9: 2600 + 325 = 2925
Step 10: 2925 + 325 = 3250
Step 11: 3250 + 325 = 3575
Step 12: 3575 + 325 = 3900
Step 13: 3900 + 325 = 4225
Step 14: 4225 + 325 = 4550
Step 15: 4550 + 325 = 4875
Step 16: 4875 + 325 = 5200
Step 17: 5200 + 325 = 5525
Step 18: 5525 + 325 = 5850
Step 19: 5850 + 325 = 6175
Step 20: 6175 + 325 = 6500
Step 21: 6500 + 325 = 6825
Step 22: 6825 + 325 = 7150
Step 23: 7150 + 325 = 7475
Step 24: 7475 + 325 = 7800
Step 25: 7800 + 325 = 8125
Step 26: 8125 + 325 = 8450
Step 27: 8450 + 325 = 8775
Step 28: 8775 + 325 = 9100
Step 29: 9100 + 325 = 9425
Step 30: 9425 + 325 = 9750
Step 31: 9750 + 325 = 10075
Step 32: 10075 + 325 = 10400
Step 33: 10400 + 325 = 10725
Step 34: 10725 + 325 = 11050
Step 35: 11050 + 325 = 11375
Step 36: 11375 + 325 = 11700
Step 37: 11700 + 325 = 12025
Step 38: 12025 + 325 = 12350
Step 39: 12350 + 325 = 12675
Step 40: 12675 + 325 = 13000
Step 41: 13000 + 325 = 13325
Step 42: 13325 + 325 = 13650
Step 43: 13650 + 325 = 13975
Step 44: 13975 + 325 = 14300
Step 45: 14300 + 325 = 14625
Step 46: 14625 + 325 = 14950
Step 47: 14950 + 325 = 15275
Step 48: 15275 + 325 = 15600
Step 49: 15600 + 325 = 15925
Step 50: 15925 + 325 = 16250
Step 51: 16250 + 325 = 16575
Step 52: 16575 + 325 = 16900
Step 53: 16900 + 325 = 17225
Step 54: 17225 + 325 = 17550
Step 55: 17550 + 325 = 17875
Step 56: 17875 + 325 = 18200
Step 57: 18200 + 325 = 18525
Step 58: 18525 + 325 = 18850
Step 59: 18850 + 325 = 19175
Step 60: 19175 + 325 = 19500
Step 61: 19500 + 325 = 19825
Step 62: 19825 + 325 = 20150
Step 63: 20150 + 325 = 20475
Step 64: 20475 + 325 = 20800
Step 65: 20800 + 325 = 21125
Step 66: 21125 + 325 = 21450
Step 67: 21450 + 325 = 21775
Step 68: 21775 + 325 = 22100
Step 69: 22100 + 325 = 22425
Step 70: 22425 + 325 = 22750
Step 71: 22750 + 325 = 23075
Step 72: 23075 + 325 = 23400
Step 73: 23400 + 325 = 23725
Step 74: 23725 + 325 = 24050
Step 75: 24050 + 325 = 24375
Step 76: 24375 + 325 = 24700
Step 77: 24700 + 325 = 25025
Step 78: 25025 + 325 = 25350
Step 79: 25350 + 325 = 25675
Step 80: 25675 + 325 = 26000
Step 81: 26000 + 325 = 26325
Step 82: 26325 + 325 = 26650
Step 83: 26650 + 325 = 26975
Step 84: 26975 + 325 = 27300
Step 85: 27300 + 325 = 27625
Step 86: 27625 + 325 = 27950
Step 87: 27950 + 325 = 28275
Step 88: 28275 + 325 = 28600
Step 89: 28600 + 325 = 28925
Step 90: 28925 + 325 = 29250
Step 91: 29250 + 325 = 29575
Step 92: 29575 + 325 = 29900
Step 93: 29900 + 325 = 30225
Step 94: 30225 + 325 = 30550
Step 95: 30550 + 325 = 30875
Step 96: 30875 + 325 = 31200
Step 97: 31200 + 325 = 31525
Step 98: 31525 + 325 = 31850
Step 99: 31850 + 325 = 32175
Step 100: 32175 + 325 = 32500
Step 101: 32500 + 325 = 32825
Step 102: 32825 + 325 = 33150
Step 103: 33150 + 325 = 33475
Step 104: 33475 + 325 = 33800
Step 105: 33800 + 325 = 34125
Step 106: 34125 + 325 = 34450
Step 107: 34450 + 325 = 34775
Step 108: 34775 + 325 = 35100
Step 109: 35100 + 325 = 35425
Step 110: 35425 + 325 = 35750
Step 111: 35750 + 325 = 36075
Step 112: 36075 + 325 = 36400
Step 113: 36400 + 325 = 36725
Step 114: 36725 + 325 = 37050
Step 115: 37050 + 325 = 37375
Step 116: 37375 + 325 = 37700
Step 117: 37700 + 325 = 38025
Step 118: 38025 + 325 = 38350
Step 119: 38350 + 325 = 38675
Step 120: 38675 + 325 = 39000
Step 121: 39000 + 325 = 39325
Step 122: 39325 + 325 = 39650
Step 123: 39650 + 325 = 39975
Step 124: 39975 + 325 = 40300
Step 125: 40300 + 325 = 40625
Step 126: 40625 + 325 = 40950
Step 127: 40950 + 325 = 41275
Step 128: 41275 + 325 = 41600
Step 129: 41600 + 325 = 41925

So, 325*129 = 41925