Online Pre-Algebra Tutoring: Prime/Composite Numbers
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Deducing Composites and Factors at eTutorWorld
Factors are numbers that you multiply to get another number
- A prime number has exactly two factors: 1 and itself.
- A composite number has more than two factors.
- Co prime numbers have only 1 as a common factor.
The number 1 is special. It only has one factor — just itself! So, 1 is neither prime nor composite.
To determine if a number is prime or composite, follow these steps:
- Find all factors of the number.
- If the number has only two factors, 1 and itself, then it is prime.
- If the number has more than two factors, then it is composite.
Learn about prime & composite numbers from Certified Online Pre-Algebra Tutor
Is 29 a prime number or a composite number?
The only factors of 29 are 1 and 29.
29 is a prime number.
Check Point
- Each of the following numbers is composite EXCEPT: 40, 41, 42, 43, 44, 45, 46, 47, 48, 49
- Is 2,7496 a composite number?
- Is the number 431 prime or composite? Explain your answer using full sentences.
- If you know 97 is a prime number what are the factors for 97 ordered from least to greatest?
- Write the even prime numbers between 1 and 50.
Answer key
- 41,43,47
- Yes
- It is prime as the number has only two factors 1, 431.
- 1,97
- 2, is the only even prime number between 1 and 50
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