Example: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF
You need at least two numbers to find a GCF.
To work out the greatest common factor, you need two numbers. In this case there is only one number so there is no 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
6 and 12 will work.
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.
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
The greatest common factor (GCF) of two (or more) numbers is the greatest factor that divides two numbers. To find the GCF you must work out and list the prime factors of each of the numbers. You will see that the numbers have prime factors in common. Multiply those factors the numbers have in common together and this gives you the GCF for the numbers. eg Number A = 18, Prime factors = 2*3*3 Number B = 24, Prime factors = 2*2*2*3 The Prime factors that A and B have in common are 2 and 3 Multiply them together = 6 6= the GCF of 18 and 24
That would be 1. The only other factor of 49 is 7, and that doesn't work.
the greatest common factor of 2600 and 420 is 20. when 2600 is divided by 20 you get 130 and when 420 is divded by 20 uget 21. I tried using higher numbers but they did not work so the answer has to be 20.
List the factors. 1, 5, 13, 65 1, 2, 4, 7, 8, 14, 16, 28, 56, 112 The only and therefore greatest common factor is 1.