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Take 30/42, for example.

The prime factorization of the numerator (30) is 2 x 3 x 5.

The prime factorization of the denominator (42) is 2 x 3 x 7.

This will help you find the GCF or the LCM.

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Q: What is the prime factorization of both the numerator and the denominator of the fraction?
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