When a the GCF of the numerator and denominator of a fraction is 1, the fraction is in its simplest form.
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It is 1.
When the numerator is less than the denominator then it is a common fraction but if the numerator is greater than the denominator then it is an improper fraction.
1 is the greatest common factor of any fraction in lowest terms.
Multiply the numerator of the fraction by the same amount that you multiply the denominator of that fraction.
That is why it is called an improper fraction because a proper or a common fraction always has its numerator less than its denominator.