Prime and Composite Numbers Worksheet
Identify and differentiate between prime and composite numbers up to 100.
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Prime and Composite Numbers
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Read each question carefully and follow the instructions to determine if a number is prime or composite.
A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself.
A composite number is a natural number greater than 1 that is not prime (i.e., it has at least one divisor other than 1 and itself).
1. The number 1 is considered a prime number.
True
False
2. All even numbers greater than 2 are composite.
True
False
1. Which of the following numbers is a prime number?
9
15
23
27
2. Which of the following numbers is a composite number?
7
11
19
39
1. The only even prime number is .
2. A number that has exactly two factors (1 and itself) is called a number.
3. The number 25 is a number because its factors are 1, 5, and 25.
1. List all the prime numbers between 10 and 30.
2. Explain why the number 12 is a composite number.
Use the number line below. Circle all the prime numbers between 0 and 20.