Composite Numbers

Composite Numbers

A Composite number is a whole number that can be divided evenly by a number other than itself or 1.   
Examples:

1 x 2 Not Composite

1 x 3Not Composite

1 x 4, 2 x 2 Composite

1 x 5Not Composite

1 x 6, 2 x 3Composite

1 x 7Not Composite

1 x 8, 2 x 4Composite

1 x 9, 3 x 3Composite

The "Sieve of Eratosthenes"  can be used to show numbers that are composite numbers from 2 to 100.   Those values that do NOT display on the Sieve of Eratosthenes are composite numbers.

Check Your Understanding

  1. Think of a composite number between 2 and 100. (ex: 42)
  2. Enter the number below. (ex: 42)
  3. Click the button "Check" and check your answer.