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Factors

A collection of math worksheets on finding factors, greatest common factors, and factor trees, as well as prime numbers & composite numbers.

Factors and Greatest Common Factors Worksheets

Factors

Finding Factors  FREE 
List all of the factors for the given numbers.
3rd through 5th Grades
Finding Factors Free Worksheet
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Common Core
Multiple Versions Available
Multiple Versions Available
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Factors on Venns
Sort factors of numbers on Venn diagrams.
3rd through 5th Grades
Factors on Venns Worksheet

Factor Trees

Factor Trees #1
Find the prime factorization by completing the basic factor trees
3rd through 5th Grades
Factor Trees #1 Factors Worksheet
Factor Trees #2
More basic factor trees for teaching prime factorization
3rd through 5th Grades
Factor Trees #2 Factors Worksheet
Factor Trees #3
Complete these factor trees (different style) to reduce a number into its prime factors.
3rd through 5th Grades
Factor Trees #3 Factors Worksheet
Factor Trees #4
More factor trees for prime factorization.
3rd through 5th Grades
Factor Trees #4 Factors Worksheet

Prime Numbers

Prime & Composite Numbers
Introduction to finding prime and composite numbers
3rd through 5th Grades
Prime & Composite Numbers Factors Worksheet
Prime & Composite Numbers 2
Practice identifying prime and composite numbers.
3rd through 5th Grades
Prime & Composite Numbers 2 Factors Worksheet
Prime & Composite Table  FREE 
Complete the prime-composite number table.
3rd through 5th Grades
Prime & Composite Table Free Factors Worksheet
Prime Number Mouse Trail
Color the prime numbers to help the mouse find the cheese.
3rd through 5th Grades
Prime Number Mouse Trail Factors Worksheet
Prime & Composite Coloring Chart
Color the prime numbers red and the composite numbers blue.
3rd through 5th Grades
Prime & Composite Coloring Chart Factors Worksheet
Prime & Composite Questions
Complete the page of short-answer questions about prime and composite numbers.
3rd through 5th Grades
Prime & Composite Questions Factors Worksheet
Sieve of Eratosthenes
Use the Sieve of Eratosthenes to find prime numbers. The sieve is simply a hundreds chart. Students check off multiples of 2, 3, 5, and 7. Every number that is not checked off is a prime number.
3rd through 6th Grades
Sieve of Eratosthenes Factors Worksheet

Greatest Common Factor (GCF)

Greatest Common Factor  FREE 
Step-by-step introduction for finding the GCF of number pairs
4th through 6th Grades
Greatest Common Factor Free Factors Worksheet
Find the GCF
Find the GCF of each pair of numbers.
4th through 6th Grades
Find the GCF Factors Worksheet
Task Cards: GCF
This file contains 15 task cards for reviewing Greatest Common Factor. Use these cards for peer review, classroom scavenger hunts, exit slips, or learning centers.
3rd through 5th Grades
Task Cards: GCF Factors Worksheet

Proper Factors and
Perfect Numbers

Proper Factors
List the proper factors of the given numbers. Proper factors are factors of a number, excluding the number itself.
3rd and 4th Grades
Proper Factors Worksheet
Proper Factors & Perfect Numbers
List the perfect factors of the given numbers. Then determine which number is a perfect number. (A perfect number is a number whose proper factors add up to the number itself.)
3rd and 4th Grades
Proper Factors & Perfect Numbers Worksheet

See Also:

Least Common Multiple (LCM) Worksheets

Worksheets in which students determine the least common multiple, or LCM, for each number set

Finding Multiples

Here you'll find resources to help students review multiples of given numbers.

Fraction Worksheets

Simplifying fractions, equivalent fractions, operations with fractions. Also includes adding, subtracting, multiplying, and dividing fractions.

Multiplication Worksheets

Practice basic multiplication skills with these printable worksheets and games

Worksheet Images

Venn Diagram Worksheets (Factors)

Factor Tree Worksheets

Prime Number Worksheets

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