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.
Type the problems from this lesson and check each step.
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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