5 and 10, among others.
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Factor both numbers. Select the factors they both have in common. Choose the largest (greatest) one.
You need at least two numbers to find a GCF.
A single number cannot have a highest common factor because "common" refers to factors that two or more numbers have in common. You have only one number.
You need at least two numbers to find a GCF.
Greatest Common Factor or Highest Common Factor (GCF or GCD or HCF) of 6 and 160 is 2.