Fun with fraction flags
http://spicytooth.co.uk/public_html/FractionFlags/fractinoflags.swf is an application which allows learners to practise fractions in a fun way.
When presented with a blank flag and instructions to make a flag with 2 colours, learners will typically make a simple half and half flag. They soon discover that there are many other possibilities and it often becomes a competition on who can come up with the most unusual design.
Options includes halves, quarters, a half and 2 quarters, three-quarters and a quarter.
A separate application for practising thirds can found here.
*Unfortunately the original link on oswego.org is no longer available. I have therefore provided an alternative link from spicytooth.co.uk