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Knowing the greatest common factor (GCF) of 12 and 42, which is 6, allows you to divide both the numerator and the denominator by 6 directly. This immediately yields the simplest form $2/7$, bypassing intermediate steps like dividing by 2 first.

Conditions: The fraction is $12/42$.; The GCF of 12 and 42 is known to be 6.

Knowing the greatest common factor (GCF) of 12 and 42, which is 6, allows you to divide both the numerator and the denominator by 6 directly. This immediately yields the simplest form $2/7$, bypassing intermediate steps like dividing by 2 first.

Conditions: The fraction is $12/42$.; The GCF of 12 and 42 is known to be 6.