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The Greatest Common Factor (GCF) is: 3
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∙ 13y ago
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What is the greatest common factor of 9and18 and 21?
The greatest common factor is 3: Factors of 9: 1, 3, 9 Factors of 18: 1, 2, 3, 6, 9, 18 Factors of 21: 1, 3, 7, 21 The two common factors are 1 and 3 and the greatest of these two is 3.
What are the common factors and greatest common factor of 21 and 42?
The common factors of 21 and 42 are 3, 7 and 21. The greatest common factor (GCF) is 21.
Why are greatest common factors always even numbers?
They aren't. The GCF of 18 and 21 is 3.
What is the greatest common factor for 21 and 36?
The factors of 21 are 1, 3, 7, and 21. The factors of 36 are 1, 2, 3, 4, 6, 9, 12, 18, and 36. The factors they have in common are 1 and 3, the largest of which is 3, so 3 is the greatest common factor. Or, you can calculate the greatest common factor by looking at the prime factors. The prime factors of 21 are 3 and 7. The prime factors of 36 are 2, 2, 3, and 3. The prime factors they have in common are a single 3, so 3 is the greatest common factor.
What is the greatest common factor of 9 18 and 21?
The Greatest Common Factor of 9, 18, 21: 3
What are the greatest common factors of 21 and 36?
The greatest common factor is 3
What is the greatest common factor of 21 and 306?
The GCF of 21 and 306 is 3. One way to determine the greatest common factor is to find all the factors of the numbers and compare them. The factors of 21 are 1, 3, 7, and 21. The factors of 306 are 1, 2, 3, 6, 9, 17, 18, 34, 51, 102, 153, and 306. The common factors are 1 and 3. Therefore, the greatest common factor is 3. The greatest common factor can also be calculated by identifying the common prime factors and multiplying them together. The prime factors of 21 are 3 and 7. The prime factors of 306 are 2, 3, 3, and 17. The prime factors in common are a single 3, so the greatest common factor is 3.
What is the greatest common factors of 63 and 147?
The greatest common factor of 63 and 147 is 21.
What is the greatest common factor of 20 and 54?
The greatest common factor of 21 and 54 is 3. The greatest common factor is the highest number that divides exactly into two or more numbers. factors of 21: 1, 3, 7, 21 factors of 54: 1, 2, 3, 6, 9, 18, 27, 54 The greatest common factor of 21 and 54 is 3.
What are the greatest common factors of 21?
The factors of 21 are 1, 3, 7, and 21. For them to be common, they need to be compared to another set of factors.
Common factors of 18 and 21?
The factors of 21 are 1, 3, 7 and 21. The factors of 18 are 1, 2, 3, 6, 14 and 18. Therefore the common factors are 1 and 3.
The greater common factor of 18 21?
The greatest common factor of 18 and 21 is 3.
