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.
Multiply the numerator of the fraction by the same amount that you multiply the denominator of that fraction.
When a the GCF of the numerator and denominator of a fraction is 1, the fraction is in its simplest form.
First, find a common denominator for the two (or more) fractions. Then, for each fraction, multiply numerator and denominator by the same number (different numbers for different fractions, though), to convert to the common denominator.
That is why it is called an improper fraction because a proper or a common fraction always has its numerator less than its denominator.
That's one fraction. You need at least two to find something in common between them.
fraction having a common denominator
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.
Dividing the numerator and denominator by a common factor is how you simplify a fraction.
You don't need a common denominator to divide fractions.
You need at least two denominators to find something in common between them.
If a fraction's numerator and denominator have no factors other than one in common, the fraction cannot be simplified except if the denominator is 1, in which case the fraction can be simplified to the whole number of the numerator.
fraction having a common denominator
If the numerator and denominator of a fraction have a common factor (except for '1'), divide both numerator and denominator by their common factor. The fraction is in the simplest form when the numerator and denominator have no common factors.
Multiply the numerator of the fraction by the same amount that you multiply the denominator of that fraction.
To convert it to a common denominator.
Find a common denominator.