Grade 6 • West Vancouver (BC)

Prime & Composite Numbers Adventure

Prime numbers have exactly two factors: 1 and the number itself. Composite numbers have more than two factors.

Prime Frequency up to 100

Bars show how many primes appear within ranges (1–20, 21–40, 41–60, 61–80, 81–100).

🐍 Our Python Snake Can Do It Too!

Python helper
🐍 Let’s see what our Python Snake can do!

      
    

    

      
      
    

    

  


  

    
Basic (10 questions)

    

      
    
        
  1. Decide if 11 is prime or composite.
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  2. Decide if 21 is prime or composite.
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  3. Decide if 13 is prime or composite.
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  4. Decide if 25 is prime or composite.
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  5. Decide if 17 is prime or composite.
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  6. Decide if 39 is prime or composite.
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  7. Decide if 2 is prime or composite.
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  8. Decide if 1 is prime or composite.
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  9. Decide if 51 is prime or composite.
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  10. Decide if 29 is prime or composite.
    11. 
      

    


    
Game • Sort the Numbers

    

      
Drag each number to Prime or Composite.

      

      

        
Prime

      

      

        
Composite

      

      

        
        
        

      

    


    
Word Problems (10)

    

  


  

    
Intermediate (10 questions)

    

      
    
        
  1. Write the prime factors of 28.
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  2. Write the prime factors of 45.
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  3. Write the prime factors of 50.
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  4. Write the prime factors of 32.
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  5. Write the prime factors of 27.
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  6. Write the prime factors of 40.
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  7. Write the prime factors of 54.
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  8. Write the prime factors of 63.
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  9. Write the prime factors of 72.
    10. 
        
  10. Write the prime factors of 99.
    11. 
      

    


    
Game • Build a Factor Tree

    

      
Click a composite number to split it into two factors. Continue until all leaves are prime.

      

      

        
        
        

      

    


    
Word Problems (10)

    

  


  

    
Advanced (10 questions)

    

      
    
        
  1. Find the GCF of 30 and 45 using prime factors.
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  2. Find the LCM of 12 and 18 using prime factors.
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  3. Is 97 prime? Explain.
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  4. Is 91 prime or composite? Show factors.
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  5. Prime factors of 210.
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  6. Prime factors of 126.
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  7. GCF of 45 and 120.
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  8. LCM of 20 and 36.
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  9. Are 29 and 31 both prime? Explain.
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  10. Is 121 prime or composite? Explain.
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Game • GCF Challenge

    

      
Click factors to collect the common prime factors of two numbers.

      

      

      

        
        
        

      

    


    
Word Problems (10)