Lesson 11 — Prime and Composite Numbers

🎯 Goal

Understand the difference between prime and composite numbers and identify them.

📖 Lesson Description

• Prime: A number greater than 1 with exactly two divisors: 1 and itself. Examples: 2, 3, 5, 7
• Composite: A number greater than 1 with more than two divisors. Examples: 4, 6, 8, 9

📝 Examples

• 7 is prime because only divisible by 1 and 7
• 12 is composite because divisible by 1,2,3,4,6,12

✏️ Practice

1. Is 13 prime or composite?
2. Is 15 prime or composite?
3. List all primes less than 20.