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Answer: The HCF of 18, 54, and 81 is 9.
The full form of the HCF is the highest common factor.
The highest common factor is located by finding all common elements of 2 numbers and choosing the most extensive one.
For instance, you have three common factors of 8 and 12, are 1, 2 and 4. In all, the common factors the highest common factor of 8 and 12 is 4.
Moreover, you can calculate the HCF from the two or more given numbers.
The HCF is the greatest or highest value of their common factors. Another name for the highest common factor is Greatest Common Divisor.
You can calculate the HCF of 18, 54, and 81 with the prime factorization method.
18 = 2 x 3 x 3
54 = 2 x 3 x 3 x 3
81 = 3 x 3 x 3 x 3
The greatest and most common factor of all factors is 3 x 3. So, you will multiply it i.e 3 x 3 = 9.
