# Adding and subtracting fractions with unlike denominators

6 videos

4 skills

We've already had some good practice adding fractions with like denominators. We'll now add fractions with unlike denominators. This is a very big deal. After this tutorial, you'll be able to add, pretty much, any two (or three or four or... ) fractions!

### Adding fractions with unlike denominators: units of 10

VIDEO
4:25 minutes

A great way to learn how to add fractions with unlike demoninators is to do so with denominators in units of 10 and 100. Like this...

### Adding fractions with 10 and 100 as denominators

PRACTICE PROBLEMS

Practice adding fractions that have denominators of 10 and 100.

### How to add fractions that have different denominators

VIDEO
4:06 minutes

To solve this problem, we need to find the least common multiple to get at the common denominator. Can you help? We bet you can!

### Example of adding fractions with unlike denominators

VIDEO
2:33 minutes

To add these fractions we need to find a common denominator. The answer can be expressed as a mixed number. Let's try together.

### Adding fractions with unlike denominators

PRACTICE PROBLEMS

Practice adding fractions that have different denominators.

### Example of subtracting fractions with unlike denominators

VIDEO
4:24 minutes

If you conquered adding fractions with different denominators, then subtracting fractions will be a snap. Don't worry...we'll take it slow and explain every step.

### Subtracting fractions with unlike denominators

PRACTICE PROBLEMS

Practice subtracting fractions that have different denominators.

### Adding fractions with different signs

VIDEO
6:22 minutes

Use a number line to add fractions with different signs.

### Adding and subtracting negative fractions

PRACTICE PROBLEMS

Practice adding and subtracting positive and negative fractions.