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 the concept of area to help find the greatest common factor in this sixth-grade worksheet!

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

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

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

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

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

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

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

Use these vocabulary cards with the EL Support Lesson: Multiples and Skip Counting.

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

Use this one-page handout to help students solidify their understanding of the real number system!

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

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

Use this handout to provide students with a fun math-centered challenge in honor of Pi Day!

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

Climb toward GCF success in this helpful sixth-grade worksheet!

Figure out factors with the help of this fun worksheet!

Gradually reveal the secret number using your knowledge of rational and irrational numbers!

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

Become the prime expert of prime numbers with this engaging maze!

Track down the tricky hidden number in this eighth-grade worksheet!

Give your child prime number practice with this simple worksheet.

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

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