The prime factorization of 54 is 2 * 3 3 The prime factorization of 90 is 2 * 3 2 * 5 What do they have in common? 2 * 3², which is 18.
The greatest common factor of 54 and 90 is 18
The greatest common factor (GCF) of 54 and 90 is 18. This is found by identifying the prime factors of each number and determining the highest powers of the shared factors. The calculation shows that GCF = 2 1 × 3 2 = 18 .
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