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Mathematics Activity :
Composite Numbers and Prime Numbers

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What is the sum of the prime numbers between 20 and 30?

3


1.

Two prime numbers whose difference is 2 are called twin prime numbers, e.g., 3 and 5. How many twin prime numbers are there upto 50?
 

2.

Which is the prime number between 90 and 100?
 

3.

What is the smallest composite number?
 

4.

What is the difference between the fifth and the second prime numbers coming after 7?
 

5.

11 is a prime factor of 187. What is the other prime factor?
 

6.

How many prime numbers are there up to 50?
 

7.

Which of the following is a composite number: 37, 47, 57, 67?
 


 
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