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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Tutoring Package	Validity	Grade (1-12), College
5 sessions	1 Month	$139
1 session	1 Month	$28
10 sessions	3 months	$269
15 sessions	3 months	$399
20 sessions	4 months	$499
50 sessions	6 months	$1189
100 sessions	12 months	$2249