5th and 6th Grade Number Theory Resources

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

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!

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!

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

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

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

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

Use this glossary with the EL Support Lesson: Doubling Multiples for Division.

Use these vocabulary cards with the EL Support Lesson: Doubling Multiples for Division.

Navigate a maze of greatest common factors in this fun worksheet!

Test your knowledge of least common multiples with this inviting maze!

Learn to determine the greatest common factor of a set of numbers in this sixth-grade worksheet!

Practice calculating the least common multiple (LCM) of two numbers with this useful worksheet!

Test your ability to find the greatest common factor (GCF) of a set of numbers with this worksheet!

Test your multiplication and division skills with this least common multiple (LCM) worksheet!

Master least common multiples (LCMs) in this essential sixth-grade worksheet!

Master determining the greatest common factor (GCF) of a set of numbers with this inviting worksheet!

Finding the greatest common factor is great fun in this color by numbers worksheet!

Identify the greatest common factor of two numbers with this colorful sixth-grade worksheet!