The Highest Common Factor (HCF) of the numbers 1, 2, and 012 (which is the same as 12) is 1.
Explanation:
To find the HCF, we first need to identify the factors of each number:
- Factors of 1: 1
- Factors of 2: 1, 2
- Factors of 12 (or 012): 1, 2, 3, 4, 6, 12
Then, we look for the highest number that appears in each list of factors. The only common factor among all three numbers is 1.
Therefore, the HCF of 1, 2, and 12 is 1.