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A factor is a divisor - a number that will evenly divide into another number. The greatest common factor of two or more numbers is the largest factor that both numbers have in common. One 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 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.
To find the greatest common factor, or GCF, you must first identify the factors for each number.For 24, its factors are 1, 2, 3, 4, 6, 8, 12, and 24.For 108, its factors are 1, 2, 3, 4, 6, 9, 12, 18, 27, 36, 54, and 108.12 is the highest (or greatest) factor they have in common, so the GCF for 24 and 108 is 12.
The greatest common factor of 27,54 and 63 is 9.
The highest common factor of 54 and 27 is 27
The ONLY common factor of 25 & 27 is... 1