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How to find the highest common factor
Using a factor tree to find the highest common factor
Keywords: HCF | | Lowest common multiple | GCF
| Math| Greatest Common Factor
The highest common factor ( HCF) is the largest number that will divide exactly into two or more numbers.
You can find the HCF by creating a factor tree for each number and look for common numbers on each factor tree.
Find the highest common factor of 9 and 27
When you create a factor tree for 9 you get the prime numbers
3 3
With 27 you get the prime numbers 3 3 3 after creating a factor tree.
9 = 3 3
27 = 3 3 3
Notice that you have 3 and 3 on both list.
In order to find the HCF you multiply 3 times 3 which equals 9
This process works for two or more numbers also.
The video works several examples.