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Prime and Composite Numbers
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Prime and Composite Numbers
📚 Part 1: Understanding Prime and Composite Numbers
1. Which statement correctly defines a prime number?
A number that can be divided by many other numbers
A number greater than 1 with exactly two factors: 1 and itself
Any odd number
A number that ends in 1, 3, 7, or 9
2. Which of these numbers are prime? (Tick all that apply)
13
15
17
21
23
3. The number 1 is:
Prime
Composite
Neither prime nor composite
4. Which number is the only even prime number?
4
2
6
8
✏️ Part 2: Identifying Factors and Classification
5. List all the factors of 18, then circle whether it is prime or composite:
Factors of 18: ________________________________
18 is: Prime / Composite (circle one)
6. List all the factors of 29, then circle whether it is prime or composite:
Factors of 29: ________________________________
29 is: Prime / Composite (circle one)
7. Complete the table by writing "Prime" or "Composite" for each number:
11: ____________
24: ____________
31: ____________
35: ____________
41: ____________
49: ____________
🔍 Part 3: Mathematical Reasoning
8. Explain why 51 is not a prime number. Show your working:
9. What pattern do you notice about prime numbers greater than 2? Explain your observation:
10. Challenge: Find the largest prime number between 80 and 100. Show how you know it's prime:
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