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Mathematics Activity :
Composite Numbers and Prime Numbers

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How many pairs of prime numbers are there to express 18 as the sum of two prime numbers?

2


1.

7 is a prime factor of 133. What is the other prime factor?
 

2.

What is the sum of the prime numbers coming immediately before and after 71?
 

3.

How many even prime numbers between 1 and 50?
 

4.

How many prime numbers are there from 30 to 50?
 

5.

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

6.

How many pairs of prime numbers are there to express 20 as the sum of two prime numbers?
 

7.

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?
 


 
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