Prime Numbers Worksheet with Mystery Picture Activity
Practice identifying prime and composite numbers with this free printable mystery picture prime numbers worksheet. Download as a free PDF.
What is a Color by Classification Activity?
A color by classification activity is a special type of worksheet that involves classifying numbers or expressions and color-coding them. In this case, students need to be able to identify prime and composite numbers in order to color in the prime numbers in the grid.
Prime Numbers Worksheet Instructions
Color in each square in the grid below that contains a prime number.
Note: since this is available as an editable PowerPoint file, you could adapt the instructions to color prime numbers one color and composite numbers a different color.
Download Free Printable Prime Numbers Worksheet with Mystery Picture Activity
This prime numbers mystery picture activity is available as both a PDF and an editable PowerPoint file.
IMPORTANT: I was notified of a mistake on the worksheet on 6/23/25. It has since been changed and corrected! Another mistake was found on 6/29/25, it has also been changed and corrected. (I guess it’s just not my summer for proof reading. Sorry, guys!)
Color by Classification Mystery Picture Prime Number Worksheet (PDF)
301 downloads – 60.55 KB
PowerPoint (in ZIP Folder)
Click here to DownloadColor by Classification Mystery Picture Prime Number Worksheet (PPT in ZIP)
196 downloads – 112.27 KB
Activity Solutions
Activity and worksheet solutions are available on a password-protected solution page. I do not openly post the answer keys because one of my goals as a resource creator is to craft learning experiences for students that are non-google-able. I want teachers to be able to use these activities and resources in their classrooms without the solutions being found easily on the Internet.
Please email me at sarah@mathequalslove.net for the password to the answer key database featuring all of my printable puzzles and math worksheets. I frequently have students emailing me for the answer key, so please specify in your email what school you teach at and what subjects you teach. If you do not provide these details, I will not be able to send you the password.
