Prime and Composite Numbers: Hidden Number #3

Reveal a secret number by identifying prime numbers in this engaging worksheet! Learners are asked to color in each box in the grid that contains a prime number. Once the correct boxes have been filled in, students will reveal a hidden number. Learners must write down the number and note whether it is prime or composite.

Geared toward fourth graders, this worksheet strengthens students’ number sense and familiarizes them with the difference between prime and composite numbers. This concept builds on learners’ prior knowledge of multiplication facts and prepares them for identifying greatest common factors. 

Be sure to try the first two worksheets in this series, Prime and Composite Numbers: Hidden Number #1 and Prime and Composite Numbers: Hidden Number #2. For more practice, try Prime Number Maze and Prime and Composite Numbers to 100.