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Greatest Common Factor

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Greatest Common Factor

Calculate the Greatest Common Factor or GCF of 8, 22, 38 and 122

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The instructions to find the GCF of 8, 22, 38 and 122 are the next:

1. Decompose all numbers into prime factors

8	2
4	2
2	2
1

22	2
11	11
1

38	2
19	19
1

122	2
61	61
1

2. Write all numbers as the product of its prime factors

Prime factors of 8	=	2³
Prime factors of 22	=	2 . 11
Prime factors of 38	=	2 . 19
Prime factors of 122	=	2 . 61

3. Choose the common prime factors with the lowest exponent

Common prime factors: 2

Common prime factors with the lowest exponent: 2¹

4. Calculate the Greatest Common Factor or GCF

Remember, to find the GCF of several numbers you must multiply the common prime factors with the lowest exponent.

GCF = 2¹ = 2

Also calculates the:

Least Common Multiple or LCM of 8, 22, 38 and 122

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