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 Common Core.

Factors
List the factors for the given numbers
3rd through 5th Grades
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Common Core
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Factor Trees
Find the prime factorization by completing the basic factor trees
3rd through 5th Grades
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More basic factor trees for teaching prime factorization
3rd through 5th Grades
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Complete these factor trees (different style) to reduce a number into its prime factors.
3rd through 5th Grades
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More factor trees for prime factorization.
3rd through 5th Grades
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Common Core
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Prime Numbers
Introduction to finding prime and composite numbers
3rd through 5th Grades
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Practice identifying prime and composite numbers.
3rd through 5th Grades
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Complete the prime-composite number table.
3rd through 5th Grades
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Color the prime numbers to help the mouse find the cheese.
3rd through 5th Grades
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Color the prime numbers red and the composite numbers blue.
3rd through 5th Grades
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Complete the page of short-answer questions about prime and composite numbers.
3rd through 5th Grades
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Greatest Common Factor (GCF)
Step-by-step introduction for finding the GCF of number pairs
4th through 6th Grades
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Find the GCF of each pair of numbers.
4th through 6th Grades
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Proper Factors and
Perfect Numbers
List the perfect factors of the given numbers. Perfect factors are factors of a number, excluding the number itself.
3rd and 4th Grades
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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
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See Also:
Fraction Worksheets (Advanced)

Simplifying fractions, equivalent fractions, and more.

Adding Fractions

Add fractions with the same and different denominators

Multiplication Worksheets

Practice basic multiplication skills with these printable worksheets and games

Least Common Multiple (LCM) Worksheets

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