How do you evaluate #-\frac { 11} { 27} - \frac { 7} { 18}#?

1 Answer
Sep 16, 2017

See a solution process below:

Explanation:

To add or subtract fractions they must be over a common denominator. To put each fraction over a common denominator multiply each fraction by the appropriate form of #1#:

#-11/27 - 7/18 =>#

#(2/2 xx -11/27) - (3/3 xx 7/18) =>#

#-22/54 - 21/54#

We can now subtract the numerators over the common denominator:

#-22/54 - 21/54 =>#

#(-22 - 21)/54#

#-43/54#