Find the Prime Numbers: Within 100

It’s time to find the prime numbers in this investigative worksheet! Students will examine a list of numbers up to 100 and identify which are prime among the composite numbers. As they determine which numbers have exactly two factors, learners consider multiplication facts and divisibility to explain why some numbers are prime and others are not.

Perfect for fourth-grade students, this worksheet strengthens understanding of prime numbers while reinforcing multiplication and division fluency. Learners will hone their recognition of factors, multiples, and divisibility—key concepts that students will use when working with prime factorization and other number relationships.

As a refresher, students may benefit from Find the Prime Numbers: Within 50. For more hands-on practice, try Prime and Composite Numbers: Hidden Number #1.