6 and 9
To find a pair of numbers with a given GCF, take the GCF number and double it. The pair of numbers is the GCF, and two times the GCF. For instance, two numbers with a GCF of 3 are 3 and 6.
3 and 18
3 and 36 9 and 12
6 and 9, among many others.
The GCF is a single number so there cannot be any pair of numbers in the answer.
If the least common multiple (LCM) of two numbers is 36 and the greatest common factor (GCF) is 3, then the two numbers can be found by multiplying the GCF by the LCM. In this case, the pair of numbers would be 3 and 36, as 3 * 36 = 108.
A number pair whose GCF is the same as one of the numbers is i , i x j where i and j are integers greater than zero. If i=3 and j=5 then the number pair will be 3,15. The GCF is 3. If i=7 and j=11 the number pair will be 7,77 and the GCF 7. The number of possible solutions is infinite.
Any consecutive even numbers have a GCF of 2.
9 and 12
The product of the GCF and LCM of a pair of numbers is equal to the product of the numbers.
Any pair of prime numbers as for example 19 and 23
The greatest common factor, or GCF, is the largest positive integer that will divide evenly with no remainder into all the members of a given set of numbers. The GCF of 6 and 9 is 3.