Here is a chance to play a version of the classic Countdown Game.
The challenge is to use the numbers available and the four standard operations (addition, subtraction, multiplication and division) to hit the target.
Start by choosing any six cards. The top row always contains the numbers 25, 50, 75 and 100, and the bottom row contains the numbers 1 to 10. Alternatively you could click on "Quickstart". Then click on "Generate new target" and the computer will choose a target.
You can only use each card once in your solution, and it is always possible to find a solution.
You may like to explore different levels of the game using the Settings menu (the purple cog).
Once you've had a go, click on "Show solutions" to show some possible ways in which the target can be reached.