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If you ask for the highest common factor, then you only get one of them. If
I gave you two of them and told you that they're both the highest, then you'd
ask me which one is the bigger highest and which one is the smaller highest.
All of the common factors of 12, 18, 24, and 30 are: 1, 2, 3, and 6 .
The highest one is 6 .
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How do you find out the HCF of 12 18?
The prime numbers of 2 and 3 are common to 12 and 18 and so 2*3 = 6 which is their highest common factor
What is a common factor of 18 and 63?
The highest common factor is 9
What is the highest common factor of 15 and 36?
Factors for 15: 3, 5 Factors for 36: 2, 3, 4, 6, 9, 12, 18 Highest common Factor: 3
Why is the greatest common factor of 18 and 48 not 12?
Because 12 isn't a factor of 18.
What is the common factor of 18 36?
You need at least two numbers to find a GCF.
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