Just 1.
1,2,4,8,16
1, 2, 4, 8, 16
The GCF is 4.
Five common factors.
Five over sixteen cannot be reduced. Sixteen is not evenly divisible by five.
GCD: 1 LCM: 400
1. That is to say, they have no prime factors in common.
The next square number after ten (which is not a square number) is 16. Sixteen has five factors.
five hundred sixteen or five hundred and sixteen
Sixteen and a half.
Since 5 is a factor of 15, all of its factors are common.
There cannot be a greatest common factor of just one number. To be common there need to be at least two numbers. If you find all the factors of two or more numbers, and you find some factors are the same ("common"), then the largest of those common factors is the Greatest Common Factor.