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Each time you visit the NRICH site there will be some activities which are 'live'. That means we are inviting you to send us your solutions and we will publish a selection of them, along with your name and your school's name. If you'd like to know more about what we're looking for, read this short article.
The last day for submitting solutions to these live problems is Monday 27 November.
The picture shows a lighthouse and some underwater creatures. Can you work out the distances between some of the different creatures?
Why not get your creative juices flowing by trying out some of the tasks on our new website Wild Maths?