Free Printable WorksheetMathGrade 5Math Curriculum5.NF.A.1

5.51 Find Common Denominators and Least Common Denominator Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 5 Math worksheet provides structured practice on 5.51 Find Common Denominators and Least Common Denominator. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Skill description: Identify a common denominator or least common denominator for two fractions and identify which set of equivalent fractions correctly uses it. Select the option that shows a correct common-denominator or equivalence strategy for the situation. Corresponding standards: CCSS 5.NF.A.1.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 5

Subject

Math

Domain

Math Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 5.51 Find Common Denominators and Least Common Denominator skill assessments:

Problem 1Difficulty: Mastery
Choose the correct complete statement for 17/40 and 11/60.
AThe LCD is 80, so 17/40 = 34/80 and 11/60 = 22/80
BThe LCD is 100, so 17/40 = 51/100 and 11/60 = 22/100
CThe LCD is 120, so 17/40 = 51/120 and 11/60 = 22/120
DThe LCD is 240, so 17/40 = 102/240 and 11/60 = 44/240 is the least setup
Solution & Explanation:The least common denominator of 40 and 60 is 120. The equivalent fractions are 51/120 and 22/120.
Problem 2Difficulty: Mastery
Which pair of scale factors changes 23/40 and 7/60 to denominator 120?
AMultiply 23/40 by 2/2 and 7/60 by 3/3
BMultiply 23/40 by 3/3 and 7/60 by 2/2
CMultiply 23/40 by 40/40 and 7/60 by 60/60
DMultiply 23/40 by 4/4 and 7/60 by 5/5
Solution & Explanation:The denominator 40 must be multiplied by 3 to reach 120, and 60 must be multiplied by 2 to reach 120.
Problem 3Difficulty: Mastery
What is the smallest common denominator greater than 100 for 13/24 and 17/40?
Solution & Explanation:The LCD of 24 and 40 is 120. Since 120 is greater than 100 and is the first common multiple, it is the smallest common denominator greater than 100.

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Frequently Asked Questions

Common questions about printing, using, and solving this worksheet

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QIs this 5.51 Find Common Denominators and Least Common Denominator worksheet free for teachers and homeschoolers?

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 5 Math students. It aligns with educational standard 5.NF.A.1 (Primary standard selected for prompt fields in this prompt cell: CCSS 5.NF.A.1. Skill statement in this prompt cell: Identify a common denominator or least common denominator for two fractions and identify which set of equivalent fractions correctly uses it. Select the option that shows a correct common-denominator or equivalence strategy for the situation. Associated standards listed with this skill in this prompt cell: CCSS 5.NF.A.1. Use this prompt-provided wording as the supporting standard description for this workflow.).

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