Adding Fractions with Unlike
To add fractions with unlike denominators,
you must first change the fractions so that
they have a common denominator.
To find a common denominator, you multiply
each fraction by the denominator of the other.
Then you find the sum by adding the
numerators of the fractions.
Simplify if possible by dividing by a common
First, find the product of the numerator.
The product of the numerator becomes the
Then find the product of the
denominators. This becomes the new
Simplify if necessary, by dividing by a
Switch the denominator and numerator
around so that the denominator of the
original fraction becomes the numerator
of the new fraction, and the numerator
of the original fraction becomes the
denominator of the new fraction.