Learning Math: Composite Numbers and Prime Numbers

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.	What is the smallest composite number?


2.	11 is a prime factor of 187. What is the other prime factor?


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


4.	What is the sum of the prime numbers between 20 and 30?


5.	How many prime numbers are there up to 50?


6.	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?


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?