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?

Written for teachers, this article discusses mathematical representations and takes, in the second part of the article, examples of reception children's own representations.

How well can you estimate 10 seconds? Investigate with our timing tool.

What can you say about the child who will be first on the playground tomorrow morning at breaktime in your school?

What statements can you make about the car that passes the school gates at 11am on Monday? How will you come up with statements and test your ideas?

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.

Have a look at this table of how children travel to school. How does it compare with children in your class?

This problem offers you two ways to test reactions - use them to investigate your ideas about speeds of reaction.

This activity asks you to collect information about the birds you see in the garden. Are there patterns in the data or do the birds seem to visit randomly?

Investigate how avalanches occur and how they can be controlled

Build a mini eco-system, and collect and interpret data on how well the plants grow under different conditions.

This article for teachers looks at some suggestions taken from the NRICH website that offer a broad view of data and ask some more probing questions about it.

How does the time of dawn and dusk vary? What about the Moon, how does that change from night to night? Is the Sun always the same? Gather data to help you explore these questions.