21 days...
21 questions...
leading to one answer...
and one winning team.

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

  No knowledge of mathematics beyond A level Mathematics required

  Four of the five preliminary round questions have now been released. The final preliminary round question will be released on 6th November 2017. These unlock a clue for the main competition.

  For the main competition, one question will be released daily for 21 consecutive weekdays. The first question will be released on 9th November 2017.

  The final question unlocks an overall answer based on the solutions to all the questions

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

  Technology can help with some Ritangle questions

  Registration for Ritangle is now open (see below).

The five preliminary questions

We would like to clarify that, in Preliminary question A, a self-descriptive number needn't have exactly 7 digits. We have slightly altered the question shown here from the version originally released to help clarify this.

The answers to the preliminary questions combine to give a string of 17 characters.

Registered teams will be able to submit their answer to this from 0900 on 6th November 2017.

A correct submission returns a clue for the main competition by email.

Preliminary question E will be available at 0900 on the 6th November.


Register your team...

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 an answer to both the preliminary round and an answer to the overall competition. The rules describe the role of the Nominating Teacher - in particular the Nominating Teacher needs to be available to be contacted during the week 7 December to 14 December 2017.

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.

...registered teams will be able to submit their answer to the preliminary round here from 0900 on 6th November 2017.

...then submit your answer to the preliminary round to unlock a clue!

Once you have registered your team (complete the form and submit your registration using the 'Register your team' button) you may submit an answer to the preliminary round below. The captain's e-mail address is required again so we can check your team has been registered.

The answer to the preliminary round is a string of 18 digits. The first two digits of this string are the position in the alphabet of the answer to preliminary question A. The other 16 digits are as described in preliminary questions B to E.

Answer: (18 digits left)

When you submit an answer an e-mail will be sent to both the team captain and the nominating teacher. For correct answers this will contain a clue for the main competition. If your answer is incorrect then you can try again. You don't need the clue to solve the main competition.

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