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

Congratulations!

We are delighted to announce that the winning team of Ritangle 2018 is from The Thomas Hardye School, Dorset .

This means that The Thomas Hardye School retain the trophy for another year!

Their fully correct answer to the final challenge was submitted on Wednesday 5th December. Once again, Ritangle was challenging and this is a magnificent achievement!

Here is the full solution to Ritangle 2018 questions 1 to 25; the final challenge.

Thanks to all the students who took part and the teachers supporting them.

Ritangle will return in 2019...

Winning School, Ritangle 2018 The Thomas Hardye School
Fully correct answers also received from

Carmel College

The English School, Nicosia

Grange Academy

The Heathland School

The King's School Canterbury

Magdalen College School

Sheffield Girls School

Sir Williams Borlase Grammar School

Queen Elizabeth's School, Barnet

Tonbridge School


  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.

Registration for Ritangle 2018 is now closed.

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

Keep your 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.