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Mathematics Activity :
Composite Numbers and Prime Numbers

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

19


1.

How many composite numbers are there from 61 to 79?
 

2.

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

3.

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

4.

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

5.

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?
 

6.

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

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 between 50 and 100?
 


 
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