pdf Identifying Prime and Compostie Numbers

This worksheet provides focused practice with identifying prime and composite numbers while reinforcing factor analysis and prime factorization concepts. Students begin by listing all factors of given numbers and determining whether each number is prime or composite based on the definition that a prime number has exactly two factors.

The second section deepens understanding by asking students to analyze expressions and determine whether they represent correct prime factorizations. Students must evaluate each factor within the expression, identify any composite numbers, and justify whether the representation is valid. This promotes careful reasoning rather than simple memorization of definitions.

By combining factor listing, classification, and analysis of prime factorizations, this resource strengthens foundational number sense and prepares students for future work with greatest common factor, least common multiple, and fraction simplification.

Skills Assessed

• Listing all factors of a number

• Identifying prime and composite numbers

• Understanding the definition of prime numbers

• Analyzing expressions for correct prime factorization

• Recognizing composite numbers within factorizations

• Strengthening number sense and multiplicative reasoning

Classroom Use

This worksheet works well as an introduction to prime and composite numbers, independent practice during a factors unit, or review before beginning prime factorization and GCF. It can also serve as a formative assessment to check students’ conceptual understanding of factors and primes.

Details

• 2 pages

• Answer key included

ID# 0072