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Calculate the Greatest Common Factor or GCF of 48, 20, 60 and 12

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The instructions to find the GCF of 48, 20, 60 and 12 are the next:

1. Decompose all numbers into prime factors

482
242
122
62
33
1
202
102
55
1
602
302
153
55
1
122
62
33
1

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

Prime factors of 48=24 . 3
Prime factors of 20=22 . 5
Prime factors of 60=22 . 3 . 5
Prime factors of 12=22 . 3

3. Choose the common prime factors with the lowest exponent

Common prime factors: 2

Common prime factors with the lowest exponent: 22

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 = 22 = 4


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