How do you simplify #9/10 - 1/5#?

1 Answer
Aug 5, 2016

Answer:

Find a common denominator, then subtract.

Explanation:

To find a common denominator, we need to find the least common multiple between the two denominators. In our case, the LCM (last common multiple) is 10 because #10*1=10# and #5*2=10#. Our expression now looks like this:

#9/10-2/10#

From here, it's simple subtraction:

#9-2=7#

#9/10-2/10=7/10#