IntegerZone Start Page

Press this button to experience the IntegerZone (there may be a delay while Java starts and/or the applet (~130k) downloads).

Applets not supported.

How it works

The integers are displayed in a simple rectangular grid. The grid can be scrolled up and down and resized. The user chooses a mode, and this defines their interaction with the integers. Some of the modes are for exploration, others help the user test their knowledge and calculation skills. Left click for the first number and right click for the second. Click on negativity to add the negative integers on the screen.

Topics Currently Included

Arithmetic: addition, subtraction, multiplication and division.
Factorization : explore and test.
Highest common factors and lowest common multiples. Using the Euclidean algorithm to find HCF's.
Multiples of a number : explore and test.
Tables Tests: addition, subtraction, multiplication and division.
Modulo arithmetic: addition and multiplication.
Casting out nines.
Primes: explore and test, prime factorization.
The Sieve of Eratosthenes.

The built-in online help explains the various modes and what is expected of the user for each one.

source: IntegerZone Start Page