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Spiro Math
In Spiro Math, you use addition, subtraction, multiplication and division on four numbers to reach a target value. In the picture above, the numbers are 2, 9, 8 and 8, and you must manipulate these to get a result of 24. If you get stuck, click on the Hint button. When you do get the solution, Spiro Math draws a spirolateral as your reward. Spirolaterals are interesting graphical figures like the one behind the problem pad in the picture above. SpiroMath requires Windows XP or later and is free software. There is no Mac version available.
