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Prime and Composite Numbers
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Prime and Composite Numbers
🔍 Part 1: Prime Detective
1. Circle the correct definition of a prime number:
A number that has exactly two factors: 1 and itself
A number that is always odd
A number that is greater than 10
A number that ends in 5
2. Which of these numbers are prime? Tick all that apply:
2
4
7
9
11
15
3. What makes the number 2 special among prime numbers?
It's the smallest prime number
It's the only even prime number
It's the largest prime number
Both A and B are correct
4. The number 12 is composite because:
It has more than two factors
It is an even number
It is greater than 10
It ends in 2
✏️ Part 2: Number Investigation
5. List all the factors of the number 18:
Factors of 18: _________________________________________________
Is 18 prime or composite? ___________________
6. Find the first 10 prime numbers and write them below:
7. Explain why the number 1 is neither prime nor composite:
8. Choose any composite number between 20 and 30. Show all its factors:
My chosen number: _______
All factors: _________________________________________________
🌟 Part 3: Real-World Connections
9. Prime numbers are used in internet security and coding. Why do you think prime numbers are useful for keeping information safe?
10. Create your own "Prime or Composite?" challenge. Write down 5 numbers and ask a friend to identify whether each is prime or composite:
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