Can you put these mixed-up times in order? You could arrange them in a circle.
You may like to read the article on Morse code before attempting this question. Morse's letter analysis was done over 150 years ago, so might there be a better allocation of symbols today?
Find the frequency distribution for ordinary English, and use it to help you crack the code.
Letters have different values in Scrabble - how are they decided upon? And would the values be the same for other languages?
Substitution and Transposition all in one! How fiendish can these codes get?
Here is the start of a six-part challenge. Can you get to the end and crack the final message?
Build a mini eco-system, and collect and interpret data on how well the plants grow under different conditions.
This problem explores the range of events in a sports day and which ones are the most popular and attract the most entries.
When Charlie retires, he's looking forward to the quiet life, whereas Alison wants a busy and exciting retirement. Can you advise them on where they should go?
Have a look at this table of how children travel to school. How does it compare with children in your class?
Anna, Ben and Charlie have been estimating 30 seconds. Who is the best?
With access to weather station data, what interesting questions can you investigate?
Which countries have the most naturally athletic populations?
In this problem you will do your own poll to find out whether your friends think two squares on a board are the same colour or not.