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Calculate the Greatest Common Factor or GCF of 47, 48, 81 and 128

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The instructions to find the GCF of 47, 48, 81 and 128 are the next:

1. Decompose all numbers into prime factors

4747
1
482
242
122
62
33
1
813
273
93
33
1
1282
642
322
162
82
42
22
1

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

Prime factors of 47=47
Prime factors of 48=24 . 3
Prime factors of 81=34
Prime factors of 128=27

3. Choose the common prime factors with the lowest exponent

Common prime factors: None

Common prime factors with the lowest exponent: None

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.

Since there are not common prime factors the GCF is 1


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