IXL | Add and subtract fractions with unlike denominators using models | 4th grade math

or

Add. Simplify your answer.

1

3

+

7

12

=

Use the model to help you.

1

3

+

1

12

1

12

1

12

1

12

1

12

1

12

1

12

ref_doc_title.

or

Learn with an example

question

Subtract. Simplify your answer.

3

6

–

5

12

=

Use the model to help you.

1

6

1

6

1

6

–

1

12

1

12

1

12

1

12

1

12

solution

The model shows

3

6

–

5

12

.

1

6

1

6

1

6

–

1

12

1

12

1

12

1

12

1

12

Rename the fractions using a common denominator.

3

6

is the same size as

6

12

.

1

6

1

6

1

6

1

12

1

12

1

12

1

12

1

12

1

12

So,

3

6

–

5

12

is the same as

6

12

–

5

12

.

Now subtract.

1

12

1

12

1

12

1

12

1

12

1

12

–

1

12

1

12

1

12

1

12

1

12

1

12

3

6

–

5

12

=

1

12

1

12

is written in simplest form.

Looking for more? Try these:

Lesson: Adding fractions with unlike denominators

Lesson: Subtracting fractions with unlike denominators

or

$Confetti$

Excellent!

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Teacher tools

Work it out

Not feeling ready yet? These can help:

Add and subtract fractions with like denominators using area models

U.3Add fractions with unlike denominators using models

U.5Subtract fractions with unlike denominators using models

P.7Identify equivalent fractions

Lesson: Adding fractions with unlike denominators

Lesson: Subtracting fractions with unlike denominators