Prime and Composite Numbers Worksheet

How well can your students identify prime and composite numbers? Do they need some additional practice determining if a number has 3 or more factors? Teach Starter has created a worksheet that your students can complete to strengthen their understanding of this skill.

With this worksheet, students will determine if a given number is prime or composite and use written expression skills to explain why a particular number is prime, composite, or neither.

An answer key is included with your download to make grading fast and easy! 

Tips for Differentiation + Scaffolding 

In addition to independent student work time, use this worksheet as an activity for:

• Guided math groups 
• Lesson warm-up
• Lesson wrap-up
• Fast finishers 
• Homework assignment
• Whole-class review (via smartboard)

If there are students who need a bit of a challenge, encourage them to play a game together. Have a 100s board and counters. Set a timer for 1 minute, then have students place counters on all of the prime numbers they can in that time.

For students who need additional assistance with the content, provide them with a multiplication chart to help them determine if a number is prime or composite. Additionally, students can review prime and composite numbers with one of Teach Starter’s prime and composite posters.

🖨️ Easily Download & Print

Use the dropdown icon on the Download button to choose between the PDF or editable Google Slides version of this resource. 

Because this resource includes an answer sheet, we recommend you print one copy of the entire file. Then, make photocopies of the blank worksheet for students to complete. 

To save paper, we suggest printing this 2-page worksheet double-sided. 

Turn this teaching resource into a sustainable activity by printing on cardstock and slipping it into a dry-erase sleeve. Students can record their answers with a whiteboard marker, then erase and reuse them. 

Get more worksheets to have handy!

This resource was created by Cassandra Friesen, a teacher in Colorado and Teach Starter Collaborator. 

Don’t stop there! We’ve got more activities to shorten your lesson planning time:  

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Prime and Composite Numbers Worksheet

A worksheet to practice the relationship between factors and prime and composite numbers.