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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 20 as the sum of two prime numbers?

2


1.

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

2.

 How many prime numbers are there up to 20?
 

3.

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

4.

 How many prime numbers are there between 1 and 10?
 

5.

 What is the smallest composite number?
 

6.

 How many composite numbers are there from 61 to 79?
 

7.

 How many prime numbers are there from 30 to 50?
 


 
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