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Interactive
Scholastic

Study Jams! Greatest Common Factor

For Students 5th - 8th Standards
When one method isn't enough to teach GCF, try two! This interactive webpage introduces factors and the prime factor tree to find the greatest common factor of two numbers. After the lesson, have learners click to try the two examples...
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Interactive
CK-12 Foundation

Greatest Common Factor Using Lists

For Students 6th Standards
By creating a list of factors for two numbers, it is easier to see the greatest common factor. Each question in an interactive resource asks pupils to identify the greatest common factor for the numbers 24 and 36 in several different...
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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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Assessment
Mathed Up!

HCF, LCM, and Product of Primes

For Students 6th - 8th Standards
Give the class a prime example of using prime numbers. After reviewing prime factorization of numbers with the video, pupils use their knowledge to determine greatest common factors and least common multiples in the worksheet. The...
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Lesson Plan
Curated OER

Greatest Common Factor and Factoring by Grouping

For Teachers 11th - Higher Ed
In this Algebra II/college level worksheet, young scholars factor polynomials by pulling out the GCF and by grouping.  The two page worksheet contains seventy–two problems.  Answers are provided. 
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Interactive
CK-12 Foundation

Greatest Common Factor Using Factor Trees

For Students 6th Standards
Beginning with a description that sets the stage, learners are asked to break down the numbers 42 and 63 to find the greatest common denominator using factor trees. As they work through the factoring process, young mathematicians are...
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Worksheet
Curated OER

Working With Common Factors and Common Multiples

For Students 5th - 6th
In this math worksheet, students learn to find common factors and common multiples for sets of numbers. First students circle the common factors they see in the examples given. Then students list the factors and multiples for each number...
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Lesson Plan
Illustrative Mathematics

Factors and Common Factors

For Teachers 5th - 7th Standards
This is an exercise in finding the greatest common factor of two whole numbers. Use in direct instruction or as part of your guided practice. Make up additional problems for home work. It also can be used as a mini-assessment or test...
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Lesson Plan
Illustrative Mathematics

Bake Sale

For Teachers 5th - 7th Standards
Put math into action with the real-life scenario of a bake sale. The participants at this bake sale are ready to divide their fresh-baked cookies into bags. It is up to your number crunchers to help decide how many cookies should go in...
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Lesson Plan
Curated OER

Find the Factors and Prime Factors

For Teachers 4th - 6th
Show the class how to find the factors of numbers. They use a variety of strategies, including unifix cubes, to find the factors of a whole number. This resource includes clear procedure to follow. Included are an anticipatory set,...
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Interactive
Curated OER

Greatest Common Factor - OnlineMathLearning.com

For Students 5th - 7th
Use this greatest common factor learning exercise to have your charges find the GCF of 3 numbers in each problem that are two and three-digit numbers. They complete 12 problems.
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Lesson Plan
Curated OER

Greatest Common Factor and Least Common Multiple Story Problems

For Teachers 4th - 5th
In this story problems worksheet, students determine whether to find either the greatest common factor or the least common multiple in order to solve the problem.
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Worksheet
Curated OER

Using a Factor Tree to Find the GCF

For Students 4th - 6th
Learners use the example of a factor tree to find the greatest common factor of three numbers in four problems.
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Activity
Math Learning Center

Grade 5 Supplement Set A2 – Number and Operations: Primes, Composites and Common Factors

For Teachers 5th Standards
Incorporate riddles into your math lesson by having students make tree factors and determine if the number is a prime or composite. They will also use other clues to find the answer to the riddle while sharpening their multiplication...
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Lesson Plan
Curated OER

Greatest Common Factor

For Teachers 10th - 12th
In this greatest common factor worksheet, students find the GCF of given terms. This one-page worksheet contains 16 problems, with answers.
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Interactive
CK-12 Foundation

Greatest Common Factor Using Lists: Tiling the Kitchen Floor

For Students 6th Standards
Use a combination of tiling a rectangle to find area and find the greatest common factor of the lengths of two sides and the area they create. Pupils increase and decrease the sides of the rectangle before answer five questions about...
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Worksheet
Curated OER

Greatest Common Factor

For Students 3rd - 6th
Given 10 number pairs, learners find the greatest common factor for each. For several, one of the numbers is the greatest common factor, and for others mathematicians will need to think a little harder. There space for learners to show...
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Worksheet
Curated OER

Greatest Common Factor

For Students 5th
In this problem solving worksheet, 5th graders practice solving the greatest common factors for 7 sets of whole numbers. Students write their answers in the boxes provided.
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Lesson Plan
Curated OER

Exploring Number Patterns to Discover Common Factors

For Teachers 3rd - 6th
Students listen and watch a video to see a drummer beat and find a pattern, while learning about the least common factor. In this activity, the concept of least common factors is being taught through the use of musical instruments, and...
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Worksheet
Curated OER

Factors and Greatest Common Factor

For Students 9th
In this factors instructional activity, 9th graders solve and complete 39 different problems that include determining the greatest common factor to solve. First, they state whether each number is prime or composite. Then, students...
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Worksheet
Curated OER

Number Sense and Numeration: Multiples, Factors and Square Roots

For Students 6th - 8th
A great resource for any math teacher covering multiples, factors or square roots; this learning exercise walks young mathematicians through the logic behind factoring and square roots with a systematic set of problems which gradually...
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Lesson Plan
Curated OER

Smart Cookie Factors

For Teachers 4th - 5th
Learners examine the concept of finding the greatest common factor. They complete number of activities as they practice identifying prime and composite numbers. Pupils apply rules of divisibility and find the greatest common factor while...
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Interactive
CK-12 Foundation

Monomial Factors of Polynomials: Mystery Boxes

For Students 8th - 10th Standards
Shortcut the work in finding total volumes. Pupils determine a polynomial expression that would represent the combined volume of three boxes. Each box has the same height, and the scholars rewrite the expression by factoring out the...
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Activity
Grid Games Galore

Math Games Students Like to Play

For Teachers 3rd - 7th
These may not all be your cup of tea, but you'll likely find some gold in this math games packet. Find brief, easy-to-execute games (like Integer Football) and that are perfect for review or even a substitute teacher plan.