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Finding Common Denominators

A Grade 4 math worksheet focused on understanding and finding common denominators for fractions.

Grade 4 Math FractionsCommon Denominators
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Includes

Fill in the BlanksMultiple Choice2 Short AnswerTrue / FalseMatching

Standards

CCSS.MATH.CONTENT.4.NF.A.1CCSS.MATH.CONTENT.4.NF.A.2

Topics

fractionscommon denominatorsmathgrade 4
8 sections · Free to use · Printable
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Finding Common Denominators Worksheet

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Read each question carefully and follow the instructions to find common denominators and compare fractions.

1. To add or subtract fractions, they must have a  .

2. The common denominator is a common   of all the denominators.

3. When you find a common denominator, you need to change both the denominator and the   of the fraction.

4. Which of these is a common denominator for 1/2 and 1/3?

a

2

b

3

c

5

d

6

5. Find a common denominator for 1/4 and 2/6. Then rewrite both fractions with the common denominator.

1/4
2/6

6. The least common multiple (LCM) of two denominators is always their common denominator.

T

True

F

False

Match the fractions on the left with their equivalent fractions using a common denominator on the right.

7. 1/3

 

a. 2/8

8. 1/4

 

b. 4/12

9. 1/2

 

c. 3/6

10. Write an equivalent fraction for 3/5 and 2/3 using a common denominator.