🔍 Part 1: Prime Detective

WALT: We are learning to identify prime and composite numbers.

Success Criteria: I can explain what makes a number prime or composite.

1. A prime number has exactly _______ factors.

2. Which of these numbers is prime?

4

7

9

12

3. Circle all the composite numbers below:

2 3 4 5 6 7 8 9 10

4. True or False: 2 is the only even prime number.

True

False

5. List all the factors of 12:

🎯 Part 2: Number Classification

6. Sort these numbers into the correct groups:

Numbers: 11, 15, 17, 18, 19, 21

7. Explain why 1 is neither prime nor composite:

8. Find the first five prime numbers greater than 20:

9. Prime numbers are used in computer security. Why do you think numbers with fewer factors would be useful for keeping information safe?

10. Extension Challenge: Can you find two prime numbers that add up to 20? Write as many pairs as you can find.

11. Create your own definition of prime numbers using simple words that a Year 4 student would understand: