Virtual Nerd: How Do You Subtract Fractions With Different Denominators?

You've got three fractions to add together. Wait! They have unlike denominators. So the first thing you have to do is find the least common denominator. Now multiply the terms so they all have the same denominator. Don't forget to...

Having a common denominator is the best thing to have when subtracting fractions. If you have a common denominator then all you have to do is subtract the numbers in the numerator.

Having a common denominator is the best thing to have when subtracting fractions. If you have a common denominator then all you have to do is subtract the numbers in the numerator.

Combine fractions that have unlike denominators and a variable. As usual the variable needs to get isolated. Then find the least common denominator so you can combine the fractions. Finally put it all back together.

Want to add fractions? Well, if they have the same denominator it's going to be so easy. Just add the numerator values together and keep the denominator the same. Easy as that.

Combining terms that have fraction coefficients means you have to use your prior knowledge of adding and subtracting fractions. Find the least common denominator so you can combine the fractions. Finally put it all back together.

Watch this video tutorial to see how to add fractions with different denominators together. First, you're going to need a common denominator. [1:57]

Rational expressions that are in the form of fractions. Yuk! The teacher demonstrates how to subtract one rational expression from the other when the expressions have a common denominator. Combine like terms and write it in simplest form.

Rational expressions that are in the form of fractions. Yuk! The teacher demonstrates how to subtract one rational expression from the other when the expressions have a common denominator. Combine like terms and write it in simplest form.

Put fractions with different original denominators in order using the least common denominator. Once she has shown how to find the least common denominator, an instructor constructs equivalent fractions that are more easily compared to...