GCD and GCF are the same thing. Factors and divisors are interchangeable. The LCD and the LCM are the same process with different results. The LCD produces a denominator, the LCM produces a whole number.
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The LCD is 1. The GCD is 17.
You don't. LCM and GCF (HCF) refer to whole numbers. You can find the LCM of two whole numbers that happen to be denominators, but in that case we call it the LCD. You can find the GCF of two whole numbers that happen to be the numerator and denominator of a fraction, and that will let you know whether the fraction can be simplified.
LCD of 16 and 12 is 2 ( 2 x 8 = 16 and 2 x 6 = 12)
the lcd is the least common denominator but the LCM is the least common multiple.
The LCD for fractions is the LCM (least common multiple) of all of the denominators.