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Prime and Composite Numbers Worksheets
Here are more than 25 prime and composite number worksheets, carefully designed for grade 4 through grade 6 students. We will clearly discuss the concepts of prime, composite, coprime, and twin prime numbers. We can classify all natural numbers as prime and composite.
Prime Numbers: Any natural number that has only two factors, the number itself and 1 is known as a prime number.
Eg. 1, 2, 3, 5,……11,……23,…..97,…
The number 3 has only two factors. That is, it is only divisible by 3 and 1. (Without leaving a remainder). Thus 3 is a prime number.
The number 2 is the smallest prime number. Interestingly, its the only even prime number which means all other prime numbers are odd.
Composite Numbers: Any natural number that can be divided by other natural numbers and with the number itself and 1 is a composite number.
Eg. 6, 8, 9,…..86,…99,…
With 1 and 6, the number 6 has other factors like 2 and 3. Thus the factors of 6 are 1, 2, 3, and 6 which makes 6 a composite number.
1 is the only number which is neither prime nor composite.
Twin primes: Prime number pairs which differ from each other by 2 are twin primes. Eg. 3 and 5, 11 and 13, 41 and 43…..
In the above shown pair of numbers, the difference between the numbers is 2.
Coprimes: Numbers that do not have any common factor other than 1 are called coprime numbers. Eg. Number pairs 2 and 3, 3 and 4, 4 and 5…………17 and 23, 29 and 31,……..
29 and 31 are both twin primes and coprimes.
All twin primes are prime numbers, whereas all coprimes need not be prime numbers.
Prime and Composite Numbers worksheets free download pdf

Differentiate prime and composite numbers
Differentiate prime and composite numbers

Circle prime and composite numbers
Circle prime and composite numbers

Write prime / composite below each number
Write prime / composite below each number

Color prime and composite numbers
Color prime and composite numbers

Cut and paste prime / composite numbers
Cut and paste prime / composite numbers

Circle coprime and twin prime numbers
Circle coprime and twin prime numbers

Write coprime and twin prime number pairs
Write coprime and twin prime number pairs