GCF - Greatest Common Factor (GCF is always smaller or equal to at least one of the numbers)
LCM - Least Common Multiple (LCM is always greater or equal to at least one of the numbers)
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The GCF is 68, the LCM is 68
the highest number that a numerator increased by its GCF
Find the GCF of the numerator and the denominator and divide them both by it. If the GCF is 1, the fraction is in its simplest form.
The GCF and LCM of 24 and 42 are 6 and 168 respectively.
The GCF is 10. The LCM is 30.