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All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. The largest of these is known as the greatest common factor, or GCF.
The factors of 30 are:
1, 2, 3, 5, 6, 10, 15, 30
The factors of 42 are:
1, 2, 3, 6, 7, 14, 21, 42
The common factors are:
1, 2, 3, 6
The Greatest Common Factor:
GCF = 6
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What is the HCF OF 81?
You need at least two numbers to find a GCF.
What is the highest common factor of 350 and 385?
There is no "common factor" of 350, to have a common factor you must have more than one number, so there is no common factor of 350.
What is the greatest common factors of 65 156 and 169?
The highest common factor (HCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! The highest factor of any number is itself.
What is the highest common factor of 112?
There cannot be a common or greatest common factor of just one number. You need two or more numbers.
What is the highest factor for 95 and 115?
95 and 115's highest common factor is five.
