You need at least two numbers to find a GCF.
is 8
1,3,7,9,21,63 1,2,3,4,8,9,18,24,36,72 The factors in common are 1,3,9 The largest (greatest) common factor is 9
the greatest common factor of 28 and another number is 7 the second number is between 60 and 70 what is it show your work
8 = 1 * 8 24 = 3 * 8 GCF is 8.
To work out the greatest common factor, you need two numbers. In this case there is only one number so there is no GCF.
List the factors. 1,7 1,2,4,5,10,20 The only, and therefore the greatest common factor is 1.
1, 2, 4, 81, 2, 5, 10The GCF is 2.
There's no work to show. 24 is a factor of 48, so it has to be the GCF.
6 and 12 will work.
The factors of 184 are: 1, 2, 4, 8, 23, 46, 92, 184 The factors of 207 are: 1, 3, 9, 23, 69, 207 The common factors are: 1, 23 The Greatest Common Factor: GCF = 23
Two or more numbers are needed to work out their GCF
If you construct them correctly, factor trees always work to determine the prime factorization of a number. Once you compare the prime factorizations of two or more numbers, it is relatively easy to find the greatest common factor of them from there.