Prime and Composite Numbers for 4th Grade
A prime number has exactly two factors, one and itself; a composite number has more. That is why one is neither. To test a number, check for factors up to its square root. The examples below work through that, with practice problems and answers.
DETAILED EXPLANATION
A prime number has exactly two factors (1 and itself). A composite number has more than two factors. 2, 3, 5, 7 are prime; 4, 6, 8, 9 are composite.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
Is 17 prime or composite?
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 17 has factors 1 and 17 only. So 17 is prime.
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