A very cool activity, and a fun way to practice the order of operations.

http://www.learnalberta.ca/content/mejhm/html/object_interactives/order_...

Choose your wheel and answer the questions. The wheels include tables, rounding, squares, and many others.

Left-click to play on-line or right-click (followed by Save Link As or equivalent) to download.
http://www.wmnet.org.uk/resources/gordon/Function%20wheel%20v6.swf

A variety of great bingo games to reinforce fraction concepts - fraction to picture, fraction to equivalent picture, equivalent fractions, improper fractions, and fractions to decimals.

Three thumbs up!

Left-click to play on-line or right-click to download.
http://www.topmarks.co.uk/r.aspx?sid=3329

A short series of interactive demonstrations to see how to find percentages of money.

http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/maths/perce...

This is an early introduction to fractions, looking at halves, thirds and quarters only.

http://www.ngfl-cymru.org.uk/vtc/ngfl/ngfl-flash/fractions/index.htm

Equivalent fractions, simplifying fractions, improper fractions to mixed numbers.
For some reason, the simplifying fraction questions always simplify to a unit fraction.

Left-click to play on-line. Right-click (and Save Link As or equivalent) to download.

http://www.wmnet.org.uk/wmnet/custom/files_uploaded/uploaded_resources/8...

A very versatile tool for learning about decimal number lines. Read the instructions on the home page first.

http://www.mathsonline.co.uk/freesite_tour/resource/whiteboard/decimals/...

Put the integers in order, with the biggest at the top of the screen and the smallest at the bottom of the screen. Three levels of difficulty.

http://www.bbc.co.uk/skillswise/numbers/wholenumbers/whatarenumbers/nega...

Estimate the number that the pointer is pointing to, and then reveal the correct answer. You can choose whole numbers or decimals, and create your own number line if you wish. Click on [Begin] to start.

http://resources.oswego.org/games/Estimate/estimate.html

Click on the link below to download this flash activity, where students are asked to compare whole numbers, fractions or decimals. You can also create your own activities, including ordering measurements with different units.

http://www.topmarks.co.uk/r.aspx?sid=2452