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Greatest Common Factor

Calculate the Greatest Common Factor or GCF of 22, 44, 66 and 88

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The instructions to find the GCF of 22, 44, 66 and 88 are the next:

1. Decompose all numbers into prime factors

222
1111
1
442
222
1111
1
662
333
1111
1
882
442
222
1111
1

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

Prime factors of 22=2 . 11
Prime factors of 44=22 . 11
Prime factors of 66=2 . 3 . 11
Prime factors of 88=23 . 11

3. Choose the common prime factors with the lowest exponent

Common prime factors: 2 , 11

Common prime factors with the lowest exponent: 21, 111

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. 111 = 22

Also calculates the:

Least Common Multiple or LCM of 22, 44, 66 and 88

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