NumihanaIs 26 prime?
Answer: prime / not prime
LEARN, PRINT & PRACTISE
Prime and composite numbers.
Determine whether a whole number is prime; one is neither prime nor composite.
Numihana · England Year 5
Prime and composite numbers
Practice sheet
Name: ______________
Date: ______________
Determine whether a whole number is prime; one is neither prime nor composite.
Is 17 prime?
Answer: prime / not prime
Is 14 prime?
Answer: prime / not prime
Is 56 prime?
Answer: prime / not prime
Is 80 prime?
Answer: prime / not prime
Is 36 prime?
Answer: prime / not prime
Numihana · England Year 5
Prime and composite numbers
Answer key
Name: ______________
Date: ______________
Determine whether a whole number is prime; one is neither prime nor composite.
Is 26 prime?
Answer: not prime
Is 17 prime?
Answer: prime
Is 14 prime?
Answer: not prime
Is 56 prime?
Answer: not prime
Is 80 prime?
Answer: not prime
Is 36 prime?
Answer: not prime
Adjust worksheet
PRINT IN BULK · UP TO 30 WORKSHEETS
Create a worksheet pack
Prepare several days of practice in one go, then print or save a PDF.
Keep the same topic and difficulty, with a different problem set on each worksheet. Questions can repeat for practice.
Handwrite on screen
Use a tablet to write directly on the worksheet and mark it with a red pen.
Pen or finger · saved on this device · no sign-in
The skill behind this activity
Determine whether a whole number is prime; one is neither prime nor composite.
Department for Education: mathematics programmes of study ↗
Year 5 → Number → Multiplication and division · Selected statutory skill. Pack 2.2.0 · source checked 2026-10-12.
For teachers and parents
A prime whole number is greater than one and has exactly two positive factors: one and itself. Test possible factors up to the square root, using division or rectangular arrays.
A common slip
One is not prime, and two is prime despite being even. A number with additional factors is composite.
Worked example
Is 61 prime?
Answer: prime
A prime whole number is greater than one and has exactly two positive factors: one and itself. Test possible factors up to the square root, using division or rectangular arrays.