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Create an unlimited supply of worksheets for adding fractions and mixed numbers (grades 4-7)! The worksheets can be made in html or PDF format — both are easy to print. You can also customize them using the generator below.

Addition of fractions is typically taught starting in 4th grade, with like fractions (same denominator, such as 3/8 + 2/8). Children start out by using manipulatives so they can understand the concept, and then they can go on to abstract problems.

Next, in 5th grade, students tackle adding unlike fractions (fractions with different denominators, such as 3/4 + 2/5) and mixed numbers with unlike fractional parts. The procedure for this involves converting the fractions to be added to equivalent fractions with a common denominator. After the conversion, you have like fractions (fractions with the same denominator) which you can add easily. To understand how this is done, please see this video on adding unlike fractions on my other site (MathMammoth.com)

In 6th and 7th grades, students simply practice addition of fractions using larger denominators and more complex problems.

### Basic instructions for the worksheets

Each worksheet is randomly generated and thus unique. The answer key is automatically generated and is placed on the second page of the file.

You can generate the worksheets either in html or PDF format — both are easy to print. To get the PDF worksheet, simply push the button titled “Create PDF” or “Make PDF worksheet“. To get the worksheet in html format, push the button “View in browser” or “Make html worksheet“. This has the advantage that you can save the worksheet directly from your browser (choose File → Save) and then edit it in Word or other word processing program.

Sometimes the generated worksheet is not exactly what you want. Just try again! To get a different worksheet using the same options:

• PDF format: come back to this page and push the button again.
• Html format: simply refresh the worksheet page in your browser window.

The fractions in grade 4 addition problems are limited to like fractions — fractions with a same denominator.

Here are some more fraction worksheets you can use in grade 4. They also use only fractions with a same denominator (like fractions).

In grade 5, students learn to add unlike fractions — fractions with different denominators.

Here are some more fraction worksheets for grade 5.

In grades 6 and 7, students simply practice addition with fractions that have larger denominators than in grade 5.

## Adding Fractions with Unlike Denominators

If the denominators are not the same, then you have to use equivalent fractions which do have a common denominator . To do this, you need to find the least common multiple (LCM) of the two denominators.

To add fractions with unlike denominators, rename the fractions with a common denominator. Then add and simplify.

For example, suppose you want to add:

The LCM of 3 and 11 is 33 . So, we need to find fractions equivalent to 1 11 and 2 3 which have 33 in the denominator. Multiply the numerator and denominator of 1 11 by 3 , and multiply the numerator and denominator of 2 3 by 11 .

( 1 × 3 11 × 3 ) + ( 2 × 11 3 × 11 ) = 3 33 + 22 33

Now we have like denominators, and we can add as described above.

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These grade 5 worksheets provide practice in adding and subtracting fractions with both like and unlike denominators .