Since 9 is a factor of 18, it is automatically the GCF.
The Greatest Common Factor (GCF) is: 9
The factors of 18 are 1, 2, 3, 6, 9, and 18. The factors of 81 are 1, 3, 9, 27, and 81. The common factors are 1, 3, and 9. Therefore, the greatest common factor is 9. You can also determine the greatest common factor from the prime factors. The prime factors of 18 are 2, 3, and 3. The prime factors of 81 are 3, 3, 3, and 3. The prime factors in common are 3 and 3, so the greatest common factor is 3 x 3 = 9.
The greatest common factor of 18 and 27 is 9.The common factors of 18 and 27 are 1, 3, and 9.Methods:One way is to make an educated guess. If you recognize that both numbers are divisible by 9, check whether the corresponding factors of the factor pairs have common factors. Note: When the sum of the digits of a number add up to 9 or a multiple of 9, that number is divisible by 9.9 x 3 = 27Since the corresponding factors of the factor pairs, 2 and 3, do not have any common factors, the greatest common factor is 9.Another way to determine the common factors and greatest common factor is to find all the factors of the numbers and compare them.The factors of 18 are 1, 2, 3, 6, 9, and 18.The factors of 27 are 1, 3, 9, and 27.The common factors are 1, 3, and 9. Therefore, the greatest common factor is 9.The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.The prime factors of 18 are 2, 3, and 3.The prime factors of 27 are 3, 3, and 3.The prime factors they have in common are 3 and 3, so the greatest common factor is 3 x 3 = 9.
The greatest common factor of 18 and 54 is 18One way to determine the greatest common factor is to find all the factors of the numbers and compare them.The factors of 18 are 1, 2, 3, 6, 9, and 18.The factors of 54 are 1, 2, 3, 6, 9, 18, 27, and 54.The common factors are 1, 2, 3, 6, 9, and 18. Therefore, the greatest common factor is 18.The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together.The prime factors of 18 are 2, 3, and 3.The prime factors of 54 are 2, 3, 3, and 3.The prime factors in common are 2, 3, and 3, so the greatest common factor is 2 x 3 x 3 = 18.Common factors of 54 and 18 are: 1, 2, 3, 6, 9, and 18.Common factors of 54 and 18 are: 1, 2, 3, 6, 9, and 18.
To find the greatest common factor for any group of numbers you must make a list of all the factors for each number. The factors of 18 are: 1, 2, 3, 6, 9, 18 The factors of 9 are: 1, 3, 9 Therefore, the greatest common factor of 18 and 9 is 9.
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The GCF is 9.
Short answer: There are none. There is neither a greatest common factor nor common factors of a single number, such as 18, because there cannot be any form of common factor without two or more numbers to compare. Common factors are factors that the numbers being compared have in common. The greatest common factor is the largest factor that all the numbers being compared have in common. Thus, since there are not two or more numbers to compare, there are neither common factors nor a greatest common factor. The factors of 18 are 1, 2, 3, 6, 9, and 18. Examples: The common factors of 18 and 24 are 1, 2, 3, and 6; the greatest common factor is 6. The common factors of 18 and 81 are 1, 3, and 9; the greatest common factor is 9. The common factors of 18 and 54 are 1, 2, 3, 6, 9, and 18; the greatest common factor is 18.
Any set of factors that had 18 as a common multiple would also have multiples of 18 in common, so 18 can't be greatest. 9 and 6 have 18 as their least common multiple.
The greatest common factor of 18 and 45 is 9.
The factors of 18 are 1, 2, 3, 6, 9, 18. The factors of 27 are 1, 3, 9, 27. The common factors of 18 and 27 are 1, 3 and 9. The greatest common factor of 18 and 27 is 9.
The factors of 9 are: 1, 3, 9The factors of 18 are: 1, 2, 3, 6, 9, 18The factors of 45 are: 1, 3, 5, 9, 15, 45The common factors are: 1, 3, 9The Greatest Common Factor (GCF) is: 9