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How Old Am I?
Odds and Evens Made Fair
Sorted
A Long Time at the Till
The Value of Working Systematically
The value of working systematically
Mathematicians often talk about the importance of working systematically on a problem, rather than approaching it in a random, unstructured way. The tasks in this feature have been chosen because systematic approaches will offer the most efficient routes to the solutions.
How Old Am I? Age 14 to 16Challenge Level 
Age 14 to 16
Challenge Level
In 15 years' time my age will be the square of my age 15 years ago. Can you work out my age, and when I had other special birthdays?
Odds and Evens Made Fair Age 14 to 16Challenge Level
Age 14 to 16
Challenge Level
In this follow-up to the problem Odds and Evens, we invite you to analyse a probability situation in order to find the general solution for a fair game.
Sorted Age 14 to 18Challenge Level
Age 14 to 18
Challenge Level
How can you quickly sort a suit of cards in order from Ace to King?
A Long Time at the Till Age 14 to 18Challenge Level
Age 14 to 18
Challenge Level
Try to solve this very difficult problem and then study our two suggested solutions. How would you use your knowledge to try to solve variants on the original problem?
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