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Lesson Plan
Better Lesson

Better Lesson: Gcf and Lcm Quiz

For Teachers 6th Standards
Sixth graders show what they know about greatest common factor and east common multiple.
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Handout
Cuemath

Cuemath: Highest Common Factor

For Students 9th - 10th Standards
Explore the world of Highest Common Factor or Greatest Common Factor (GCF) by going through its various aspects and properties. Find answers to questions like what is the highest common factor for a group of numbers, easy ways to...
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Lesson Plan
George Mason University

Margo Mankus: Investigating Lcm and Gcf Using Rods

For Teachers 9th - 10th Standards
This lesson plan is for an activity using rods (Cuisenaire Bars) to help students understand the concept of factors, in particular the LCM and GCF of two numbers.
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Activity
Purple Math

Purplemath: Lcm & Gcf

For Students 9th - 10th Standards
Purplemath shows an easy and orderly way to determine the GCF and LCM of any two numbers. Even large numbers won't be a challenge with this method.
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Unit Plan
Mangahigh

Mangahigh: Number: Least Common Multiple and Greatest Common Factor

For Students 4th - 7th Standards
This site provides students practice with the concept of least common multiples and greatest common factors. Students can learn about the topic by completing an interactive tutorial. Students can then take a ten question timed test to...
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Interactive
AAA Math

Aaa Math: Least Common Multiple

For Students 3rd - 8th Standards
This tutorial offers an explanation of least common multiples, practice finding them and a game to play. There is a lot of information available at this location.
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Activity
Discovery Education

Discovery Education: Web Math: Find the Least Common Multiple of Some Numbers

For Students 3rd - 8th Standards
Use this site to find the Least Common Multiple (LCM) of any set of numbers. Simply type in your numbers, and the site will provide the answer complete with a full explanation.
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Lesson Plan
University of Nottingham

Mars: Finding Factors and Multiples

For Teachers 6th Standards
This lesson is intended to help you to assess how well students are able to understand the meanings of the terms 'Greatest Common Factor' (GCF) and 'Least Common Multiple' (LCM). PowerPoint slides are provided for this lesson.
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Activity
Other

Help With Fractions: Finding the Least Common Multiple

For Students 3rd - 8th Standards
This website gives an excellent explanation of how to find the least common multiple. It offers two different methods and gives easy to follow step by step directions.
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Unit Plan
Khan Academy

Khan Academy: Gcf & Lcm Word Problems

For Students 5th - 7th Standards
Solve word problems where you either need to find the GCF or LCM. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.
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Lesson Plan
Better Lesson

Better Lesson: Multiples, Lcm, and Gcf

For Teachers 6th Standards
What are multiples? How do they compare with factors? Students work to answer these questions and develop an understanding of greatest common factor and least common multiple.
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Lesson Plan
Better Lesson

Better Lesson: Greatest Common Factor & Least Common Multiple

For Teachers 6th Standards
Clearly understand the difference between factors and multiples builds a foundation for applications and problem solving using GCF and LCM.
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Article
Cuemath

Cuemath: Least Common Multiple

For Students 5th - 8th Standards
Learn about the properties of Least Common Multiples (LCM) and the three methods to find the LCM. Included are solved examples and interactive problems for review.
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Unknown Type
Khan Academy

Khan Academy: Least Common Multiple

For Students 6th - 8th
In this exercise, students practice finding least common multiple. Students receive immediate feedback and have the opportunity to get hints and try questions repeatedly.
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Activity
Cool Math

Coolmath: Gcf's and Lcm's Least Common Multiple

For Students 7th - 9th
These prealgebra-arithmetic lessons explains greatest common factors (GCF's) and least common multiples (LCM's) and shows how to find them.
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eBook
Math Planet

Math Planet: Finding the Least Common Multiple

For Students 6th - 8th Standards
Gain an understanding of the least common multiple by viewing an example and a video lesson.
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Activity
Math Slice

Math Slice: Least Common Multiple: Math Worksheets

For Students 3rd - 5th Standards
This tool allows you to create worksheets where students must find the lowest common factor in a set of two to four whole numbers.
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Activity
Cool Math

Coolmath: Gcf's and Lcm's Common Multiples

For Students 5th - 8th Standards
These prealgebra-arithmetic lessons explain greatest common factors (GCF's) and least common multiples (LCM's) and show how to find them.
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Unit Plan
Shmoop University

Shmoop: Basic Operations: Lcm & Gcf

For Students 9th - 10th Standards
Students learn about the least common multiple and the greatest common factor. The resource consists of notes, step-by-step examples, and practice problems with solutions.
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Unknown Type
Elias Saab

Math Drills: Lcm and Gcd Quiz

For Students 9th - 10th Standards
An interactive quiz which provides students with two numbers and asks them to find either the Least Common Multiple or the Greatest Common Divisor between them. Students input their solution and have the program evaluate it. Hints are...
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Activity
National Council of Teachers of Mathematics

The Math Forum: Ask Dr. Math: Greatest Common Factors, Least Common Multiples

For Students 9th - 10th
Math Forum response to request for info on how to find greatest common factors, and how this compares to least common multiples. Explanation includes examples of each.
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University of Waterloo (Canada)

University of Waterloo: Cemc: Math Circles: Number Theory Ii [Pdf]

For Teachers 9th - 10th
This worksheet provides a series of problem-solving questions that require higher order thinking skills. Questions will include finding the greatest common divisor, and least common multiple.
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Unknown Type
McGraw Hill

Glencoe: Self Check Chapter Test Fractions and Decimals

For Students 5th - 6th
Students are assessed on fractions and decimals. Topics include greatest common factor, improper fractions, and fractions as decimals. The self-checking test includes hints and solutions.
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Lesson Plan
Better Lesson

Better Lesson: Lcm Stations Activity

For Teachers 6th Standards
Learning about factors and multiples allows students to see number relationships and apply those number relationships to multiplication and division.

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