Let's roll up our sleeves and solve this. We have 0 and we're going to multiply it by 124, essentially adding 0 to itself 124 times.
Step 1: 0 + 0 = 0
Step 2: 0 + 0 = 0
Step 3: 0 + 0 = 0
Step 4: 0 + 0 = 0
Step 5: 0 + 0 = 0
Step 6: 0 + 0 = 0
Step 7: 0 + 0 = 0
Step 8: 0 + 0 = 0
Step 9: 0 + 0 = 0
Step 10: 0 + 0 = 0
Step 11: 0 + 0 = 0
Step 12: 0 + 0 = 0
Step 13: 0 + 0 = 0
Step 14: 0 + 0 = 0
Step 15: 0 + 0 = 0
Step 16: 0 + 0 = 0
Step 17: 0 + 0 = 0
Step 18: 0 + 0 = 0
Step 19: 0 + 0 = 0
Step 20: 0 + 0 = 0
Step 21: 0 + 0 = 0
Step 22: 0 + 0 = 0
Step 23: 0 + 0 = 0
Step 24: 0 + 0 = 0
Step 25: 0 + 0 = 0
Step 26: 0 + 0 = 0
Step 27: 0 + 0 = 0
Step 28: 0 + 0 = 0
Step 29: 0 + 0 = 0
Step 30: 0 + 0 = 0
Step 31: 0 + 0 = 0
Step 32: 0 + 0 = 0
Step 33: 0 + 0 = 0
Step 34: 0 + 0 = 0
Step 35: 0 + 0 = 0
Step 36: 0 + 0 = 0
Step 37: 0 + 0 = 0
Step 38: 0 + 0 = 0
Step 39: 0 + 0 = 0
Step 40: 0 + 0 = 0
Step 41: 0 + 0 = 0
Step 42: 0 + 0 = 0
Step 43: 0 + 0 = 0
Step 44: 0 + 0 = 0
Step 45: 0 + 0 = 0
Step 46: 0 + 0 = 0
Step 47: 0 + 0 = 0
Step 48: 0 + 0 = 0
Step 49: 0 + 0 = 0
Step 50: 0 + 0 = 0
Step 51: 0 + 0 = 0
Step 52: 0 + 0 = 0
Step 53: 0 + 0 = 0
Step 54: 0 + 0 = 0
Step 55: 0 + 0 = 0
Step 56: 0 + 0 = 0
Step 57: 0 + 0 = 0
Step 58: 0 + 0 = 0
Step 59: 0 + 0 = 0
Step 60: 0 + 0 = 0
Step 61: 0 + 0 = 0
Step 62: 0 + 0 = 0
Step 63: 0 + 0 = 0
Step 64: 0 + 0 = 0
Step 65: 0 + 0 = 0
Step 66: 0 + 0 = 0
Step 67: 0 + 0 = 0
Step 68: 0 + 0 = 0
Step 69: 0 + 0 = 0
Step 70: 0 + 0 = 0
Step 71: 0 + 0 = 0
Step 72: 0 + 0 = 0
Step 73: 0 + 0 = 0
Step 74: 0 + 0 = 0
Step 75: 0 + 0 = 0
Step 76: 0 + 0 = 0
Step 77: 0 + 0 = 0
Step 78: 0 + 0 = 0
Step 79: 0 + 0 = 0
Step 80: 0 + 0 = 0
Step 81: 0 + 0 = 0
Step 82: 0 + 0 = 0
Step 83: 0 + 0 = 0
Step 84: 0 + 0 = 0
Step 85: 0 + 0 = 0
Step 86: 0 + 0 = 0
Step 87: 0 + 0 = 0
Step 88: 0 + 0 = 0
Step 89: 0 + 0 = 0
Step 90: 0 + 0 = 0
Step 91: 0 + 0 = 0
Step 92: 0 + 0 = 0
Step 93: 0 + 0 = 0
Step 94: 0 + 0 = 0
Step 95: 0 + 0 = 0
Step 96: 0 + 0 = 0
Step 97: 0 + 0 = 0
Step 98: 0 + 0 = 0
Step 99: 0 + 0 = 0
Step 100: 0 + 0 = 0
Step 101: 0 + 0 = 0
Step 102: 0 + 0 = 0
Step 103: 0 + 0 = 0
Step 104: 0 + 0 = 0
Step 105: 0 + 0 = 0
Step 106: 0 + 0 = 0
Step 107: 0 + 0 = 0
Step 108: 0 + 0 = 0
Step 109: 0 + 0 = 0
Step 110: 0 + 0 = 0
Step 111: 0 + 0 = 0
Step 112: 0 + 0 = 0
Step 113: 0 + 0 = 0
Step 114: 0 + 0 = 0
Step 115: 0 + 0 = 0
Step 116: 0 + 0 = 0
Step 117: 0 + 0 = 0
Step 118: 0 + 0 = 0
Step 119: 0 + 0 = 0
Step 120: 0 + 0 = 0
Step 121: 0 + 0 = 0
Step 122: 0 + 0 = 0
Step 123: 0 + 0 = 0
Step 124: 0 + 0 = 0

So, 0*124 = 0