Estimate the position of a given number on a number line. Levels 1 to 4 are whole numbers, while levels 5 to 8 are decimals.

http://www.oswego.org/ocsd-web/games/Estimate/estimate.html

Students play a version of Connect Four, gaining the chance to place a piece on the board by answering questions about simplify fractions, converting fractions to decimals and percents, as well as algebra questions involving fractions.

http://www.shodor.org/interactivate/activities/FractionFour/

Click on two cards to turn them over. If they match, they are cleared from the board. If not, they remain on the board. How many turns will it take you to clear the board?

http://www.interactivestuff.org/match/maker.phtml?featured=1&id=8

This is a flipchart with many interactive pages. You may need to become a member (its free!) of the Promethean Planet forum to access it.
http://www.prometheanplanet.com/us/server/show/ConResource.337

Go here to become a member of the USA Promethean Planet Forum:
http://www.prometheanplanet.com/us/server/show/nav.802

Count forwards and backwards with the Super Sequencer, including decimals and negative numbers. There are 3 speeds - slow, medium and fast. From Ambleside Primary.
http://www.amblesideprimary.com/ambleweb/mentalmaths/supersequencer.html

The Multi Sequencer displays two sequences simultaneously. Click on [Instructions] and then [More] to get some ideas how you might use this.
http://www.amblesideprimary.com/ambleweb/mentalmaths/multisequencer.html

Explore the relationship between fractions and decimals with your class. Click the IDEAS button for some great ideas. From Ambleside Primary.
http://www.amblesideprimary.com/ambleweb/mentalmaths/fracto.html

http://www.oswego.org/ocsd-web/games/Estimate/estimate.html

Estimate the position of the arrow on the number line. You can choose the scale - either whole numbers (4 scales to choose from) or decimals (2 scales to choose from, or make your own).

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