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Finding Common Denominator - Printable Mathematics Worksheets - Wayground

Finding Common Denominator

10 questions

5th - 5th Grade

Mathematics

This Grade 5 mathematics worksheet gives students focused practice finding common denominators and identifying the least common denominator. It includes 10 questions: 2 multiple-select items in which students choose every valid common denominator, followed by 8 multiple-choice items that ask them to select the least common denominator from a set of options. The worksheet builds accuracy with recognizing multiples and distinguishing any common denominator from the least one. Students work through denominator sets that include straightforward and less immediate relationships, such as selecting 35 as the least common denominator from 15, 21, and 35 or 24 from 16, 24, 36, and 48. It is useful for Grade 5 fraction instruction, independent practice, review, or a quick check of understanding before students apply common denominators to fraction problems. This free printable worksheet includes a complete answer key for efficient checking and feedback.

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Finding Common Denominator

Total questions: 10

Name
Class
Date
1.

Select all that could be common denominators for:

35and 34\frac{3}{5}and\ \frac{3}{4}  

a)

10

b)

20

c)

30

d)

40

2.

Select all that could be common denominators for:

23and 56\frac{2}{3}and\ \frac{5}{6}  

a)

6

b)

9

c)

12

d)

18

3.

What is the least common denominator for

25 and 37\frac{2}{5}\ and\ \frac{3}{7}  

a)

15

b)

21

c)

35

d)

40

4.

What is the least common denominator for

13 and 46\frac{1}{3}\ and\ \frac{4}{6}  

a)

3

b)

6

c)

12

d)

18

5.

What is the least common denominator for

57 and 13\frac{5}{7}\ and\ \frac{1}{3}  

a)

3

b)

7

c)

18

d)

21

6.

What is the least common denominator for

411 and 23\frac{4}{11}\ and\ \frac{2}{3}  

a)

11

b)

30

c)

33

d)

66

7.

What is the least common denominator for

18 and 29\frac{1}{8}\ and\ \frac{2}{9}  

a)

24

b)

36

c)

54

d)

72

8.

What is the least common denominator for

610 and 26\frac{6}{10}\ and\ \frac{2}{6}  

a)

20

b)

30

c)

60

d)

120

9.

What is the least common denominator for

12 and 47\frac{1}{2}\ and\ \frac{4}{7}  

a)

14

b)

12

c)

10

d)

8

10.

What is the least common denominator for

38 and 16\frac{3}{8}\ and\ \frac{1}{6}  

a)

16

b)

24

c)

36

d)

48

Answer Key

Finding Common Denominator

Total questions: 10

1.
b)

20

, d)

40

2.
d)

18

, a)

6

, c)

12

3.
c)

35

4.
b)

6

5.
d)

21

6.
c)

33

7.
d)

72

8.
b)

30

9.
a)

14

10.
b)

24

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FAQs

What does this Finding Common Denominator worksheet cover?

This Grade 5 worksheet practises identifying valid common denominators and selecting the least common denominator. Its 10 items use 2 multiple-select questions for choosing all possible common denominators and 8 multiple-choice questions for identifying the least option, helping students distinguish a shared multiple from the smallest shared multiple.

How can I use this worksheet to teach finding the least common denominator?

Introduce the difference between a common denominator and the least common denominator before students begin the items. Have students list or test multiples for each denominator, then use the two multiple-select questions to discuss why more than one answer can be valid before moving to the eight questions that require only the least choice.

What mistakes should I watch for when students complete this worksheet?

Students may select only one answer on the first two multiple-select items, even when several options are valid, or choose a number that is a multiple of only one denominator. In the eight multiple-choice items, watch for students choosing any common denominator instead of the least one, such as selecting a larger shared multiple when a smaller option is available.

How do I assign and grade this Finding Common Denominator worksheet?

You can assign it as a printable PDF or use it as a digital quiz on Wayground. The worksheet includes a complete answer key, and printable student work can be graded by scanning it with the Wayground for Teachers app. The printable format also gives schools an option for reducing screen time during denominator practice.

How can I differentiate this common denominator worksheet for my students?

Use the worksheet’s Advanced Settings to adjust font spacing or choose a larger font size so the multiple-select and multiple-choice options are easier to scan. You can also enable a dyslexia-friendly font or translate the denominator questions into another language when that better supports access to the worksheet.

Where can I find more worksheets like this on Wayground?

Wayground offers a broad collection of free printable worksheets and practice problems across subjects, with downloadable PDFs and answer keys to support essential skills and concepts. Browse more resources at https://wayground.com/en-us/worksheets.

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