25 questions...
..one final challenge..
..and one winning team.

  Ritangle is a competition for teams of students of A level Mathematics, the International Baccalaureate and Scottish Highers.

  No knowledge of mathematics beyond A level Mathematics required.

  The first five questions were released on 1st, 8th, 15th, 22nd, 29th October 2018.

  The other 20 questions will then be released daily (on weekdays) from Wednesday November 7th 2018, with question 25 released on Tuesday 4th December 2018.

  Correct answers to questions release a clue for the final question.

  The final question will be made available on Wednesday 5th December 2018.

  A maths hamper, including a one-year subscription to Integral, and trophy for the school or college of the winning team!

  Technology can help with some Ritangle questions.

  Register your team for Ritangle today!

Register below now!

Good luck
with Ritangle 2018!

Full description and rules

Download a classroom poster about Ritangle


We are delighted that GCHQ is sponsoring this year’s Ritangle competition

Register your team now!

First, please read the rules of the competition. Team captains need to register their team take part in Ritangle. It is essential that a team is registered to be able to submit answers to the final question. The rules describe the role of the Nominating Teacher - in particular the Nominating Teacher needs to be available to be contacted between 5th and 14th December 2018.

I agree to the competition rules as stated here and that the nominating teacher may be contacted, only in relation to this competition, via the e-mail address provided. The captain's e-mail address will only be used to send e-mails in response to answer submissions via forms on these pages. E-mail addresses provided will not be passed on to any other organisation or used for any purpose other than this competition.

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MEI value the privacy of your personal data. Please see MEI’s Privacy Notice. This explains how we collect, store and handle your personal data.


Clues for Ritangle 2018


The correct answer to each of questions 1 to 25 releases a particular clue for the final question.





Please collect your clues carefully without sharing them with anyone outside your team. In addition, make a note of your final answers for the first 25 questions, because you will need them again later.




Keep you answers safe for now (and don't share with other teams!), see above for details of how correct answers to these questions unlock clues for the final question.

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2017 MEI. Integral is produced by MEI, an independent charity committed to improving mathematics education. Registered Charity Number 1058911.