Learning Math: Composite Numbers and Prime Numbers

Mathematics Activity :
Composite Numbers and Prime Numbers

Quick Reference
Type your answers in the input boxes below.

Fill in the blanks

Your Performance

7 is a prime factor of 133. What is the other prime factor?
19

1.	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?


2.	What is the smallest composite number?


3.	How many composite numbers are there from 61 to 79?


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


5.	How many prime numbers are there between 1 and 10?


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


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