# Factors

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

## Factors

List all of the factors for the given numbers.
3rd through 5th Grades
Sort factors of numbers on Venn diagrams.
3rd through 5th Grades

## 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

Introduction to finding prime and composite numbers
3rd through 5th Grades
Practice identifying prime and composite numbers.
3rd through 5th Grades
Complete the prime-composite number table.
3rd through 5th Grades
Color the prime numbers to help the mouse find the cheese.
3rd through 5th Grades
Color the prime numbers red and the composite numbers blue.
3rd through 5th Grades
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
Find the GCF of each pair of numbers.
4th through 6th Grades
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

## Proper Factors andPerfect 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

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

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