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

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

1.	Which is the prime number between 90 and 100?


2.	How many prime numbers are there up to 20?


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


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


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


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