From From the The Standards Site Interactive Teaching Programs website: Decimal Number Line is an interactive teaching program which allows you to select an interval from a given number line and show that interval as a second number line divided into ten equal parts but on a bigger scale...

The program is available in a number of formats including a Windows exe file, a Macintosh file and as a flash program. Supporting documentation is also available. Web address: http://tinyurl.com/325zyx

For additional flash files for teaching primary mathematics, visit The Standards Site Interactive Teaching Programs website:
http://www.standards.dfes.gov.uk/primary/publications/mathematics/itps/