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Interactive
Curated OER

Least Common Multiple or Least Common Denominator

For Students 5th - 6th
Fifth and sixth graders solve 12 math problems by finding the least common multiple or least common denominator. They type the answer into the text box.
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Worksheet
Curated OER

Least Common Multiple

For Students 6th - 9th
Give students detailed instructions on how to find the Least Common Multiple as well as practice with this thorough introductory worksheet. Instructions for this worksheet include an explanation of both guess and check as well as prime...
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Interactive
Online Math Learning

Word Problems That Use GFC or LCM

For Students 4th - 6th
This is a webpage that contains five word problems requiring learners to find the least common multiple or least common denominator.
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PPT
Curated OER

Fraction XII: Subtracting Unlike Denominators

For Teachers 4th - 5th
This fractions PowerPoint defines and gives examples of multiples and least common multiple, then models how to list multiples and circle the least common multiple. Each step to use in subtracting fractions with unlike denominators is...
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PPT
Curated OER

Fraction X--Adding Unlike Denominators

For Teachers 4th - 5th
In this math PowerPoint, the process of adding fractions with unlike denominators is broken down into a logical, easy-to-follow sequence of steps. Definitions and examples of multiples, least common multiple, and least common denominator...
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Worksheet
Curated OER

LCD of Expressions

For Students 11th
For this algebra worksheet, 11th graders solve rational expression by converting the denominators to the same unit using the least common denominator and multiplication. There are 13 problems.
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Lesson Plan
West Contra Costa Unified School District

Lowest Common Multiple through the Grades

For Teachers 8th - 10th Standards
The LCM will be your new BFF. Learners review least common multiple and least common denominator applications, mostly on fractions, from middle school. Scholars then see how the LCM can be applied to various types of problems from...
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Lesson Plan
EngageNY

Least Common Multiple and Greatest Common Factor

For Students 6th Standards
Find the common denominator between prime factors, factor trees, and the distributive property. Scholars learn to find the least common multiple and greatest common factor of pairs of numbers. They rotate through stations to connect...
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Interactive
Curated OER

Adding and Subtracting Fractions (With Unlike Denominators)

For Students 5th - 6th
In this math worksheet, students subtract and add fractions with unlike denominators. Students solve the problem in steps. They are given examples of how to solve the problems.
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Worksheet
Curated OER

Least Common Multiple

For Students 3rd - 6th
Given ten pairs of numbers, mathematicians find the least common multiple for each. The numbers span from 2-30, and are generally introductory for this skill (no curve balls). Encourage learners to write out multiples alongside the...
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Lesson Plan
1
1
Illustrative Mathematics

Listing Fractions in Increasing Size

For Teachers 3rd - 5th Standards
Increase the depth of your class's fractional number sense with this number-ordering activity. Given four fractions, each with different numerators and denominators, young learners are asked to place them in order from smallest to...
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Assessment
PBS

Working with Common Denominators: Assessments

For Students 4th - 6th Standards
Now that the practice is over, see if young mathematicians can utilize their new skills on finding common denominators and adding fractions. The assessment contains one map challenge and follows with skills practice. 
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Lesson Plan
Illustrative Mathematics

Multiples and Common Multiples

For Teachers 6th - 7th Standards
Learners are asked to find multiples and common multiples of two numbers. They must take their findings and find a pattern between the numbers and explain their reasoning. Use this resource with The Florist Shop activity in this series...
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Worksheet
Curated OER

Lowest Common Denominator Worksheet

For Students 5th - 6th
In this fractions activity, students follow the steps to finding the lowest common denominator, filling in the answers to the prompts for each step.
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Lesson Plan
Curated OER

Adding Fractions With Like Denominators

For Teachers 4th - 5th
Students investigate the concept of adding fractions with like denominators. They review how to combine the numerators. Students use cutouts to handle fractions that are hands on while comparing them to slices of pizza. They work...
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Worksheet
Curated OER

Least Common Multiples

For Students 6th - 8th
In this math instructional activity, students find the least common multiple of sets of numbers. Students factor each number to their prime factorization. They use the primes to find the least common multiples. This is a instructional...
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Worksheet
Curated OER

Least Common Multiple

For Students 9th - 11th
In this least common multiple learning exercise, students find the least common multiple of given numbers.  Problems contain variables and exponents.  This two-page learning exercise contains 26 problems.  Answers are provided on the...
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Interactive
2
2
Scholastic

Study Jams! Add & Subtract with Common Denominators

For Students 3rd - 6th Standards
RJ and Zoey are at camp and need to get back to the mess hall for lunch, but they don't know how far they have to walk. Help them figure out the distance while teaching young mathematicians how to add and subtract fractions with this...
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Worksheet
PBS

Working with Common Denominators: Activities and Supplemental Materials

For Students 4th - 6th Standards
Enjoy these straightforward and simple activity pages that practice with different denominators. The practice starts simple with adding fractions together and then works on a recipe that needs to be tripled. 
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Worksheet
Curated OER

Adding Fractions

For Students 4th - 5th
Each of these 20 fraction pairs needs to be totaled, but that's not all there is to do! Scholars find the least common denominator first, then reduce the answer to simplest form if needed. These practice problems are excellent in the...
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Worksheet
K-5 Math Teaching Resources

Adding Mixed Numbers (Unlike Denominators)

For Students 3rd - 6th Standards
Mix things things up in your elementary math class with a series of problem-solving exercises. Presented with a series of mixed number word problems, young mathematicians are asked to solve them by using either visual fraction models or...
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Interactive
Curated OER

TAKS Math Quiz-LCD

For Students 4th - 5th
In this TAKS math quiz activity, students take an online quiz focused on finding the least common denominator. Quiz can be graded online by clicking a link.
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Interactive
1
1
Scholastic

Study Jams! Compare Fractions & Mixed Numbers

For Students 3rd - 6th Standards
Follow along with RJ from the Study Jams! crew as he walks step-by-step through the process for comparing fractions with unlike denominators. Starting with finding the least common denominator, the presentation goes on to demonstrate how...
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Worksheet
Curriculum Corner

Fraction Brochures

For Students 4th - 6th Standards
Make fractions fun and interesting by using a brochure form. Young mathematicians practice and gain a better understanding of how to add and subtract fractions, simplify fractions, and find LCD (least common denominator). The resources...

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