The factors of 27 are:
1, 3, 9, 27
The factors of 54 are:
1, 2, 3, 6, 9, 18, 27, 54
The Greatest Common Factor:
GCF = 27
It is: 2
The greatest common factor of two numbers has to show up on the lists of factors of both numbers.
The factors of 49 are:1, 7, 49The factors of 63 are:1, 3, 7, 9, 21, 63The Greatest Common Factor:GCF = 7
listing method , factor tree
You don't. You could find the greatest common factor by listing all the factors of a given set of numbers and selecting the largest one common to all the lists. I find the prime factorization method to be faster and easier.
121: 11-11 132: 2-2-3-11 Great common factor: 11 Method(s) used: # (used) The method to find the greatest common factor of numbers is to find the prime factorizations of each one, select all matching prime factors, and then multiply. # An alternative method is to find all of the factors of each, and then select the greatest number that appears in each list. # The final method only applies to some numbers; if one of the number is a factor of the other, then that number is the greatest common factor. This is because all numbers are factors of themselves, and that is their greatest factor. If it is also a factor of the other number, then it is definitely the greatest common factor.
196: 2-2-2-2-11 1078: 2-7-7-11 Greatest common factor: 22 Method(s) used: # The method to find the greatest common factor of numbers is to find the prime factorizations of each one, select all matching prime factors, and then multiply. # An alternative method is to find all of the factors of each, and then select the greatest number that appears in each list. # The final method only applies to some numbers; if one of the number is a factor of the other, then that number is the greatest common factor. This is because all numbers are factors of themselves, and that is their greatest factor. If it is also a factor of the other number, then it is definitely the greatest common factor.
The great common factor of 16 and 18 is 2.Method 1: Listing FactorsList all the factors of both numbers and the highest factor that is the same is the greatest common factor.Factors of 16: 1, 2, 4, 8Factors of 18: 1, 2, 3, 6, 9The greatest common factor is 2.Method 2: Prime FactorizationFind the prime factorization of each number. The prime numbers that the numbers all share multiply to the great common factor.16 = 2 * 2 * 2 * 218 = 2 * 3 * 316 and 18 share one 2 as a prime factor. Therefore, the greatest common factor is 2.
The factors of 18 are:1, 2, 3, 6, 9, 18The factors of 20 are:1, 2, 4, 5, 10, 20The Greatest Common Factor:GCF = 2
The highest common factor of two numbers is their highest common factor. The method that is used to find it is irrelevant.
The greatest common factor of 42 and 45 is 3.Method 1: Listing Factors List all the factors of both numbers and the highest factor that is the same is the greatest common factor.Factors of 42: 1, 2, 3, 6, 7, 14, 21Factors of 45: 1, 3, 5, 9, 15The greatest common factor is 3.Method 2: Prime FactorizationFind the prime factorization of each number. The prime numbers that the numbers all share multiply to the great common factor.42=2*3*745=3*3*542 and 45 share one 3. Therefore, the greatest common factor is 3.
It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers. You have only one number in the question! There can, therefore, be no method for a question that has no meaning.