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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.

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

2.

How many prime numbers are there up to 50?
 

3.

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

4.

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

5.

How many prime numbers are there between 50 and 100?
 

6.

How many prime numbers are there from 30 to 50?
 

7.

How many prime numbers are there up to 20?
 


 
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