A really really cool interactive game to practise number properties. Thirty particles fall from above. Use the repelling particle to nudge them into the correct box depending on whether they contain a square number or a prime number.

An interactive whiteboard game to practise number properties. Thirty particles fall from above. Use the repelling particle to nudge them into the correct box depending on whether they contain a square number or a prime number.

Three thumbs up!

Instructions
http://www.teacherled.com/2008/09/02/particle-maths/

Resource
http://www.teacherled.com/resources/particle/particleload.html

A neat visual way to find the LCM (lowest common multiple) of two numbers.

http://www.teacherled.com/resources/LCM/LCMload.html

Click on the numbers to complete the sequence.
http://www.oswego.org/ocsd-web/games/spookyseq/spookytrino.html

A simple but effective idea, and nicely implemented!
Students can paint in a given percentage on a 100 grid.

Or a teacher could paint in a percentage and camera it to a page of an IWB document.
http://www.oswego.org/ocsd-web/games/PercentPaint/ppaint.html

Ghost Evens
Click on the even numbers repeatedly to rack up your score.
http://www.oswego.org/ocsd-web/games/Ghostblasterseven/ghosteven.html

Ghost Odds
Click on the odd numbers repeatedly to rack up your score.
http://www.oswego.org/ocsd-web/games/GhostblastersOdd/ghostodd.html

Three thumbs up!

Here is a variety of interactive fraction activities to reinforce fraction concepts.

Fraction Flags (halves and quarters)
http://www.oswego.org/ocsd-web/games/fractionflags/fractionflags.html

Fraction Flags (thirds)
http://www.oswego.org/ocsd-web/games/fractionflags/ffthirds.html

Fraction Paint (2 by 2)
http://www.oswego.org/ocsd-web/games/FractionPaint/fpaint4.html

Fraction Paint (3 by 3)
http://www.oswego.org/ocsd-web/games/FractionPaint/fpaint9.html

Fraction Paint (4 by 4)
http://www.oswego.org/ocsd-web/games/FractionPaint/fpaint16.html

Fraction Paint (5 by 5)
http://www.oswego.org/ocsd-web/games/FractionPaint/fpaint25.html

Fraction Paint (6 by 6)
http://www.oswego.org/ocsd-web/games/FractionPaint/fpaint36.html

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

Choose your starting number. Then click repeatedly on only those ghosts which are multiples of that number. How long does it take to reach 100?
Three thumbs up!

http://www.oswego.org/ocsd-web/games/Ghostblasters1/gbcd.html

Prime Factors Calculator
Type in a number (it can be a large number but not TOO large) and click {OK} to see its prime factors.
http://newmanservices.com/primefact/

The Nth Prime Number
Enter a value for n below, from 1 to 10^12, inclusive. The server will return the nth prime number (counting 2 as the first). Commas and scientific notation (e.g. 1.0e12) are allowed.
http://primes.utm.edu/nthprime/index.php#nth

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/