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.

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.