The GCF of 63, 171, and 306 is 9.
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Here are pairs of numbers with 6 as their greatest common factor: 6, 18 12, 30 120, 126 306, 318 6 and 12
Short answer: There are none. There is neither a greatest common factor nor common factors of a single number, such as 145, 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 145 are 1, 5, 29, and 145. Examples: The common factors of 30 and 145 are 1 and 5; the greatest common factor is 5. The common factors of 145 and 149 are only 1; the greatest common factor is 1. The common factors of 145 and 174 are 1 and 29; the greatest common factor is 29.
No, 51 isn't prime. 17 is the largest prime factor of 306.
Least common multiple of 18 and 34 is 306.
The greatest common factor of 30 and 48 is 6.6 x 5 = 306 x 8 = 48