Let's roll up our sleeves and solve this. We have 0 and we're going to multiply it by 67, essentially adding 0 to itself 67 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

So, 0*67 = 0