Prime and Composite Numbers Worksheets
Decide if each number is prime or composite.
Prime and Composite Numbers
Name:Date:Score:
A prime number has exactly two factors (1 and itself). A composite number has more. Tick the correct box.
- 19 prime composite
- 236 prime composite
- 319 prime composite
- 48 prime composite
- 529 prime composite
- 647 prime composite
- 717 prime composite
- 820 prime composite
- 918 prime composite
- 105 prime composite
- 1140 prime composite
- 1250 prime composite
- 1314 prime composite
- 1445 prime composite
- 1513 prime composite
- 1615 prime composite
- 1737 prime composite
- 1825 prime composite
- 197 prime composite
- 2030 prime composite
Printable Worksheets for Kids · printableworksheetsforkids.pages.dev
Prime and Composite Numbers
Name:Date:Score:
A prime number has exactly two factors (1 and itself). A composite number has more. Tick the correct box.
- 132 prime composite
- 230 prime composite
- 319 prime composite
- 435 prime composite
- 520 prime composite
- 617 prime composite
- 750 prime composite
- 837 prime composite
- 929 prime composite
- 1039 prime composite
- 1121 prime composite
- 1241 prime composite
- 1336 prime composite
- 1443 prime composite
- 1549 prime composite
- 168 prime composite
- 1725 prime composite
- 1831 prime composite
- 1913 prime composite
- 204 prime composite
Printable Worksheets for Kids · printableworksheetsforkids.pages.dev
Prime and Composite Numbers
Name:Date:Score:
A prime number has exactly two factors (1 and itself). A composite number has more. Tick the correct box.
- 142 prime composite
- 216 prime composite
- 311 prime composite
- 417 prime composite
- 59 prime composite
- 631 prime composite
- 722 prime composite
- 821 prime composite
- 937 prime composite
- 103 prime composite
- 1141 prime composite
- 127 prime composite
- 1334 prime composite
- 1414 prime composite
- 1525 prime composite
- 168 prime composite
- 1738 prime composite
- 1818 prime composite
- 1919 prime composite
- 2026 prime composite
Printable Worksheets for Kids · printableworksheetsforkids.pages.dev
Answer key — Sheet A (20 answers)
- 1. composite
- 2. composite
- 3. prime
- 4. composite
- 5. prime
- 6. prime
- 7. prime
- 8. composite
- 9. composite
- 10. prime
- 11. composite
- 12. composite
- 13. composite
- 14. composite
- 15. prime
- 16. composite
- 17. prime
- 18. composite
- 19. prime
- 20. composite
Answer key — Sheet B (20 answers)
- 1. composite
- 2. composite
- 3. prime
- 4. composite
- 5. composite
- 6. prime
- 7. composite
- 8. prime
- 9. prime
- 10. composite
- 11. composite
- 12. prime
- 13. composite
- 14. prime
- 15. composite
- 16. composite
- 17. composite
- 18. prime
- 19. prime
- 20. composite
Answer key — Sheet C (20 answers)
- 1. composite
- 2. composite
- 3. prime
- 4. prime
- 5. composite
- 6. prime
- 7. composite
- 8. composite
- 9. prime
- 10. prime
- 11. prime
- 12. prime
- 13. composite
- 14. composite
- 15. composite
- 16. composite
- 17. composite
- 18. composite
- 19. prime
- 20. composite
About this skill
A quick test: try dividing by 2, 3, 5 and 7. If none divide exactly, a number under 50 is prime.
How to teach it
- List factors in pairs, working from 1 upwards until the pairs meet.
- Use a factor tree for prime factorisation.
- Learn the divisibility rules for 2, 3, 5, 9 and 10 first.
Mistakes to watch for
- Missing factor pairs or listing a factor twice.
- Calling 1 a prime or treating 9 as prime.
Where to go next
- Divisibility RulesG4, G5 · Factoring & Prime Factors
- Factors of a NumberG4 · Factoring & Prime Factors
- Greatest Common Factor (GCF)G5, G6 · Factoring & Prime Factors
- Least Common Multiple (LCM)G5, G6 · Factoring & Prime Factors
- MultiplesG3, G4 · Factoring & Prime Factors
- Prime FactorizationG5, G6 · Factoring & Prime Factors
