Identifying Prime and Composite Numbers - Prime(P) or Composite(C) Practice

Sep 30, 2026

Worksheets for determining whether given integers are prime or composite. Each prompt presents a numbered list of values and requires selecting Prime (P) or Composite (C) for every item. An included answer key assigns the correct P/C classification for each number shown. Additional sheets vary the selection of integers and include multiple practice sets and a modified version for reinforcement.

LanguageEnglish

CategoryExam

FormatPDF

Pages30

Reading Time1 h 16 min

AccessFree to download

Determine Prime or Composite

Answer Key (P/C)

Identifying Prime and Composite Numbers Name: Determine if the number shown is Prime(P) or Composite(C). 1) 65 2) 8 3) 41 4) 53 5) 71 6) 56 7) 87 8) 86 9) 90 10) 2 11) 73 12) 98 13) 97 14) 3 15) 21 16) 47 17) 92 18) 34 19) 15 20) 29 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Answers Math [www.CommonCoreSheets.com](www.CommonCoreSheets.com) 1 1-10 11-20 95 45 90 40 85 35 80 30 75 25 70 20 65 15 60 10 55 5 50 0 Identifying Prime and Composite Numbers Name: Answer Key Determine if the number shown is Prime(P) or Composite(C). Answers 1) 65 1. C 2) 8 2. C 3) 41 3. P 4) 53 4. P 5) 71 5. P 6) 56 6. C 7) 87 7. C 8) 86 8. C 9) 90 9. C 10) 2 10. P 11) 73 11. P 12) 98 12. C 13) 97 13. P 14) 3 14. P 15) 21 15. C 16) 47 16. P 17) 92 17. C 18) 34 18. C 19) 15 19. C 20) 29 20. P Math [www.CommonCoreSheets.com](www.CommonCoreSheets.com) 1 1-10 11-20 95 45 90 40 85 35 80 30 75 25 70 20 65 15 60 10 55 5 50 0 Identifying Prime and Composite Numbers Name: Determine if the number shown is Prime(P) or Composite(C). C C P P C P P P C C P C C 1) 65 2) 8 3) 41 4) 53 5) 71 6) 56 7) 87 8) 86 9) 90 10) 2 11) 73 12) 98 13) 97 Answers 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Math Modified [www.CommonCoreSheets.com](www.CommonCoreSheets.com) 1 1-10 11-13 92 15 85 77 8 0 69 62 54 46 38 31 23 Identifying Prime and Composite Numbers Name: Determine if the number shown is Prime(P) or Composite(C). 1) 85 2) 19 3) 89 4) 28 5) 73 6) 88 7) 43 8) 83 9) 52 10) 20 11) 61 12) 26 13) 17 14) 31 15) 48 16) 9 17) 77 18) 5 19) 69 20) 79 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Answers Math [www.CommonCoreSheets.com](www.CommonCoreSheets.com) 2 1-10 11-20 95 45 90 40 85 35 80 30 75 25 70 20 65 15 60 10 55 5 50 0 Identifying Prime and Composite Numbers Name: Answer Key Determine if the number shown is Prime(P) or Composite(C). Answers 1) 85 1. C 2) 19 2. P 3) 89 3. P 4) 28 4. C 5) 73 5. P 6) 88 6. C 7) 43 7. P 8) 83 8. P 9) 52 9. C 10) 20 10. C 11) 61 11. P 12) 26 12. C 13) 17 13. P 14) 31 14. P 15) 48 15. C 16) 9 16. C 17) 77 17. C 18) 5 18. P 19) 69 19. C 20) 79 20. P Math [www.CommonCoreSheets.com](www.CommonCoreSheets.com) 2 1-10 11-20 95 45 90 40 85 35 80 30 75 25 70 20 65 15 60 10 55 5 50 0 Identifying Prime and Composite Numbers Name: Determine if the number shown is Prime(P) or Composite(C). C P P P P C P C P C C C P 1) 85 2) 19 3) 89 4) 28 5) 73 6) 88 7) 43 8) 83 9) 52 10) 20 11) 61 12) 26 13) 17 Answers 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. Math Modified [www.CommonCoreSheets.com](www.CommonCoreSheets.com) 2 1-10 11-13 92 15 85 77 8 0 69 62 54 46 38 31 23 Identifying Prime and Composite Numbers Name: Determine if the number shown is Prime(P) or Composite(C). 1) 47 2) 97 3) 20 4) 94 5) 98 6) 4 7) 69 8) 62 9) 89 10) 2 11) 51 12) 5 13) 91 14) 7 15) 57 16) 67 17) 17 18) 83 19) 71 20) 11 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. Answers Math [www.CommonCoreSheets.com](www.CommonCoreSheets.com) 3 1-10 11-20 95 45 90 40 85 35 80 30 75 25 70 20 65 15 60 10 55 5 50 0 Identifying Prime and Composite Numbers Name: Answer Key Determine if the number shown is Prime(P) or Composite(C). Answers 1) 47 1. P 2) 97 2. P 3) 20 3. C 4) 94 4. C 5) 98 5. C 6) 4 6. C 7) 69 7. C 8) 62 8. C 9) 89 9. P 10) 2 10. P 11)

FAQs

How do you decide if a number is prime or composite?

The worksheet asks you to classify each number as Prime (P) or Composite (C). Use the definition of prime versus composite to make the selection for every item.

What does the answer key provide?

The answer key lists each numbered problem and the correct classification as P or C for that number.

Are there multiple practice sets in the document?

Yes. The document includes repeated “Identifying Prime and Composite Numbers” sections with different sets of numbers, plus a modified practice version.

Sep 30, 2026

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