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The common factors are 1 and 7. (7 = 1 x 7 and 21 = 3 x 7)
The only common prime factor is 7, which is also the largest common factor.
Wiki User
∙ 7y ago
Wiki User
∙ 6y agoMultiples of 21 include 21, 42, 63, 84 and so on. For them to be common, they need to be compared to another set of multiples.
Wiki User
∙ 11y agoYou need at least two numbers to find a GCF.
Wiki User
∙ 6y agoMultiples of 21 include 21, 42, 63, 84 and 105. For them to be common, they need to be compared to another set of multiples.
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What are the least common multiples of 72 and 21?
The least common multiple of the numbers 72 and 21 is 504.
What are the multiples of 7 and 3?
Multiples of 3 are 3, 6, 9 and so on. Multiples of 7 are 7, 14, 21 and so on. The common multiples of 3 and 7 include 21, 42, 63 and so on.
What to do to find the least common multiples of 21 and 25?
Multiply them together.
What are common multiples of 7 and 3?
21, 42, 63 and so on.
How many common multiples of 2 and 3 are there between 20 and 80?
There are 10 multiples of 6 in that range.
Common multiples of 21 and 49?
LCM of 21 & 49 is 147, so all multiples of 147 are common multiples of 21 & 49.
What are the Common multiples of 21 and 18?
there are infinite amount of common multiples.
What are common multiples of 9 21?
The common multiples of 9 and 21 are 63, 126, 189 and so on.
What are the two common multiples of 21 and 15?
Two common multiples of 21 and 15 are 105 and 315.
What are the multiples of 3and 21?
The common multiples of 3 and 21 are 21, 42, 63 and so on.
What are the common multiples of 21 and 11?
Multiply 21 and 11 to get a common multiple. Since 21 and 11 have no common factors, that also happens to be the least common multiple.All other common multiples are multiples of this least common multiple.
What are the common multiples of 21 and 9?
Any pair of numbers has an infinite set of common multiples. The lowest common multiple of 9 and 21 is 63 and the others are multiples of this, e.g. 63, 126, 189, 252, 315, ...
What are the common multiples of 3 7 but not 6?
Odd multiples of 21.
What is another common multiple of 21?
Multiples of 21 include 21, 42, 63, 84 and so on. For them to be common, they need to be compared to another set of multiples.
What are common multiples of 3 and 21?
Any multiple of 21.
What is the common multiples of 21 and 15?
105
