prime and composite numbers examples grade 4

📚 Quick Study Guide

🔢 Prime Number: A prime number is a whole number greater than 1 that has only two factors (divisors): 1 and itself. Example: 2, 3, 5, 7, 11, etc. ➕ Composite Number: A composite number is a whole number greater than 1 that has more than two factors (divisors). Example: 4, 6, 8, 9, 10, etc. ➗ Factors: Factors are numbers that divide evenly into another number. For example, the factors of 6 are 1, 2, 3, and 6. 💡 The number 1: The number 1 is neither prime nor composite. It only has one factor (itself). 🧐 Identifying Prime Numbers: To check if a number is prime, try dividing it by prime numbers less than its square root. If none divide evenly, it's prime.

📝 Practice Quiz

1. Which of the following is a prime number?
   1. 4
   2. 6
   3. 7
   4. 9
2. Which of the following is a composite number?
   1. 2
   2. 3
   3. 5
   4. 8
3. What are the factors of 12?
   1. 1, 2, 3, 4, 6, 12
   2. 1, 2, 4, 6
   3. 2, 3, 4, 6
   4. 1, 3, 4, 6, 12
4. Which number is neither prime nor composite?
   1. 0
   2. 1
   3. 2
   4. 4
5. Which of the following is a prime number between 10 and 20?
   1. 12
   2. 15
   3. 17
   4. 18
6. Which of the following is a composite number less than 10?
   1. 3
   2. 5
   3. 7
   4. 9
7. How many prime numbers are there between 1 and 10?
   1. 2
   2. 3
   3. 4
   4. 5