3rd - 6th Grade Common Core Number Theory Resources

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! 

Give your learners practice finding the greatest common factor (GCF) and the least common multiple (LCM) with this fun code-breaking worksheet!

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

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

Boost your learner's understanding of number theory with this sixth-grade math worksheet all about prime factorization!

Become a GCF master with this math worksheet! Practice finding the greatest common factor of 2 or 3 numbers ranging all the way up to 100.

Give your students practice finding the greatest common factor (GCF) with this fun code-breaking worksheet!

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

Give your students practice finding the least common multiple (LCM) with this fun code-breaking worksheet!

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

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.

Teach your students to use factor rainbows to find the greatest common factor of two given numbers.

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

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

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

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

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

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

This worksheet gives students practice identifying multiples of a number.