Ritangle - an Integral maths competition

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 will be released on 1st, 8th, 15th, 22nd, 29th October 2018. Correct answers to these questions release a clue for the final question

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

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

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

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.

Team Captain Name:

Captain's E-mail:

Team Name:

School/College name:

Nominating Teacher Name:

Nominating Teacher Email:

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.

Data Privacy

The information you provide here is being collected by MEI.

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.

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.

Captain's E-mail:

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.

The first five questions will be released on Monday 1st, 8th, 15th, 22nd, 29th October 2018 at 0900.

Keep you answers safe for now (and don't share with other teams!), instructions about how to use your answers to unlock clues will follow on Twitter and on this webpage.

Home Contact us Terms and Conditions Cookie Policy Privacy

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