Our goal is to add/subtract two fractions with the same denominator. In the previous examples and practice problems we found a common denominator.
Now we will find the least common
denominator (LCD). For example in 
, we could compute.
But we really only need to
rewrite ⅓:
While 18 is a common denominator
in the above example, 6 is the smallest common denominator. When denominators
get more complicated, either by being large or having variables in them, you
will find it easier to use the LCD o add or subtract fractions. The solution
might require less reducing, too.
In the following practice
problems one of the denominators will be the LCD; you only need to rewrite the
other.
Practice
Solutions
“Sumber Informasi”
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