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Add Fractions with Unlike Denominators

Subject Area: Mathematics (B.E.S.T.) | Grade Level: 5
Lesson Length: 30 minutes
Keywords/Tags: Add fractions with unlike denominators
Lesson Description: When fractions have different denominators, you have to find a common denominator before you can add or subtract. Find your common denominator with these tools: least common multiple or greatest common factor.

MA.5.FR.2.1 Add and subtract fractions with unlike denominators, including mixed numbers and fractions greater than 1, with procedural reliability.

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Video : Add Fractions with Unlike Denominators

Instructions: Please watch the following video as many times as needed before starting to go through other lesson pages. Understanding the content of the video is very important since the lesson activities will be all about this video content.

Quiz : Quiz

Instructions: Please complete this quiz by choosing the correct answer for each question. You can take this quiz as many times needed.

Question #1

1/2 + 2/5 =

A) 3/7

B) 3/10

C) 9/10

D) 5/10

Question #2

1/4 + 3/8 =

A) 4/8

B) 5/8

C) 1/6

D) 4/12

Question #3

5/6 + 2/12 =

A) 1

B) 7/18

C) 10/12

D) 8/12

Question #4

4/5 + 4/15 =

A) 8/20

B) 18/15

C) 1 1/15

D) 1 2/15

Question #5

3/7 + 2/3 =

A) 1 2/21

B) 5/10

C) 1/2

D) 1 5/21

Question #6

1 2/5 + 2 4/7 =

A) 3 6/12

B) 3 1/2

C) 3 32/35

D) 3 34/35

Question #7

1 1/2 + 2 1/3 =

A) 2 5/6

B) 3 5/6

C) 3 2/5

D) 3 2/6

Question #8

5/6 + 4/12 =

A) 7/10

B) 1 1/6

C) 1/8

D) 1 1/12

Question #9

5/12 + 2/3 =

A) 1 1/12

B) 7/10

C) 1 1/6

D) 1 1/20

Question #10

9/20 + 3/5 =

A) 2 1/20

B) 2 3/10

C) 1 3/10

D) 1 1/20

Resources : Resources

Instructions: Please see additional external resources below. Feel free visit each link to learn more about this lesson.

Game: Adding Fractions with Unlike Denominators

Standards: MA.5.FR.2.1

Video : Add Fractions with Unlike Denominators

Quiz : Quiz

Resources : Resources