3rd - 5th Grade Number Theory Worksheets

Use this number theory worksheet to practice finding the greatest common factor of two numbers by finding the prime factorization! 

Find factor pairs of two-digit numbers with this fourth-grade math worksheet!

Students build their number sense as they practice finding the least common multiple of whole numbers in this math worksheet! 

Grow students’ math skills with more practice finding the greatest common factor by using factor trees to find the prime factorization.

With this worksheet, your child will be learning about factors, and they'll be getting multiplication practice as they go.

From multi-digit subtraction to identifying prime numbers, assess each student’s mastery of a variety of fourth-grade math skills.

Give students practice identifying prime numbers with this fun this maze activity!

Students practice solving a variety of equations, then determine if the answer is a prime number.

Students build their number sense by finding the multiples of whole numbers in this fourth-grade math worksheet!

Find the greatest common factor (GCF) using the prime factorization method with this sixth-grade practice worksheet!

Students continue to hone their understanding of how to find the least common multiple in this math practice worksheet! 

Children practice identifying factors with the help of a factor tree in this multiplication worksheet.

Help students build their number sense as they practice finding the least common multiple (LCM) in this helpful practice worksheet.

This multi-part worksheet helps students practice identifying the differences between regular and irregular hexagons while also reviewing their knowledge of composite and prime numbers.

Does your child know the difference between a prime number and a composite number? Help them learn the difference with this simple worksheet.

Think about the importance of determining the factors of a product.

Students practice identifying prime numbers, regular polygons, and irregular polygons!

Give your child prime number practice with this simple worksheet.

What is a prime number? A number is prime when it is only divisible by 1 and itself. Help your little mathematician recognize prime numbers.

Use this glossary with the EL Support Lesson: Multiples and Skip Counting.

Introduce your child to factor trees with this simple algebra worksheet.

Use your multiplication skills to find factors of 60 and better understand time.

Students will match a product to its factor tree and list of prime factors in this interactive activity.

This worksheet gives students practice identifying multiples of a number.

Here's a way for your third grader to practice finding multiples of two.

Use this glossary with the EL Support Lesson: Factor Friend or Foe?

Use these vocabulary cards with the EL Support Lesson: Conversations About Prime and Composite Numbers.

Use this glossary with the EL Support Lesson: The Factor Tree Strategy.

Use these vocabulary cards with the EL Support Lesson: The Factor Tree Strategy.

Use these vocabulary cards with the EL Support Lesson: Factor Friend or Foe?