Learning Math: Composite Numbers and Prime Numbers

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?
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1.	7 is a prime factor of 133. What is the other prime factor?


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


3.	How many pairs of prime numbers are there to express 24 as the sum of two prime numbers?


4.	What is the sum of the prime numbers coming immediately before and after 50?


5.	11 is a prime factor of 187. What is the other prime factor?


6.	How many prime numbers are there between 50 and 100?


7.	How many prime numbers are there up to 20?