# Factors

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

To see Common Core Standards for these worksheets, click on the common core symbol .

Factors
Factor Trees
Find the prime factorization by completing the basic factor trees
3rd through 5th Grades
More basic factor trees for teaching prime factorization
3rd through 5th Grades
Complete these factor trees (different style) to reduce a number into its prime factors.
3rd through 5th Grades
More factor trees for prime factorization.
3rd through 5th Grades
Prime Numbers
Complete the page of short-answer questions about prime and composite numbers.
3rd through 5th Grades
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
Greatest Common Factor (GCF)
Step-by-step introduction for finding the GCF of number pairs
4th through 6th Grades
Proper Factors and
Perfect Numbers
List the proper factors of the given numbers. Proper factors are factors of a number, excluding the number itself.
3rd and 4th Grades
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
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

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