Free Year 6 Prime & Composite worksheets (printable PDF)
Free printable Year 6 prime & composite worksheets, organised using England's year-group terminology and an age-equivalent library level (Key Stage 2), covering prime and composite numbers. Pick a set below to print or save as a PDF, or generate a fresh one. Answers are computed in code from the exact questions on the page; Pro unlocks the printable answer key and removes the watermark. No login is needed to use the worksheet.
What is prime & composite?
A prime number has exactly two factors (1 and itself); a composite number has more than two.
How to teach it
Test whether a number has exactly two factors (prime) or more (composite) using arrays. Learn that 1 is neither.
Worked example
Common mistake
Calling 1 prime, and assuming all odd numbers are prime (9, 15).
What's inside
- Is 40 prime or composite?
- Is 52 prime or composite?
- Is 41 prime or composite?
- Is 39 prime or composite?
- Is 13 prime or composite?
- Is 20 prime or composite?
Sample questions. Each printable set below has fresh numbers; its printable answer key is available with Pro.
Year 6 Prime & Composite worksheet sets
All prime & composite worksheets →Sets A-F are the same worksheet with different questions - print any (or all) for fresh practice.
Frequently asked questions
Are these Year 6 prime & composite worksheets free?
Yes. Every worksheet on ChalkBee is free to view and print or save as a PDF, with no login required. Pro unlocks the printable answer key and removes the watermark.
Do the worksheets have answer keys?
The answers are computed in code from the exact questions on each sheet. The printable answer key is available with Pro.
How was the Year 6 level chosen?
The collection uses Year 6 terminology and an age-equivalent worksheet-library level. Key Stage 2 is shown as year-group context, not as a claim that every sheet maps to a specific statutory curriculum objective. There are 6 printable sets on this page.
How do I print or download them?
Open any set, then use your browser's print option to print it or to save it as a PDF. The pages are laid out to print cleanly on standard letter or A4 paper.