# 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

From here, it's simple subtraction: