# How do you simplify #4/5-4/7#?

##### 1 Answer

Jun 18, 2018

#### Explanation:

Whenever we do addition or subtraction with fractions, we must have a common denominator.

The easiest way to achieve a common denominator is to multiply the top and bottom of the first by

Notice, we are not changing the value since we are essentially multiplying by

Now that we have common denominators, we can just subtract the numerators. We'll get

Since the numerator and denominator have no common factors, this fraction is in simplest form.

Hope this helps!