Ritangle 2020

Ritangle 2020 took place 5 October - 15 December 2020.

Ritangle is a competition designed for teams of students aged 16‌-‌18 who are currently studying either:

  • A level Mathematics
  • the International Baccalaureate
  • Scottish Highers
  • qualifications with equivalent content.

For more information about Ritangle, please visit the page for this year's competition.

Ritangle 2020 winners

Congratulations to the winning team from

The Cherwell School, Oxford

Ritangle 2020 runners-up

The team from King Edward VI School, Stratford-Upon-Avon were runners up. They also produced some excellent work in stage 3 of the final question.

Teams from the following schools also reached stage 3 of the final question. Less than 5% of the teams that entered achieved this in a very challenging Ritangle 2020. Congratulations to all the schools and colleges below:

  • The West Bridgford School
  • Hills Road Sixth Form College
  • King Edward VI School, Southampton
  • Royal Grammar School, Guildford
  • Queensmead School
  • The London Oratory School
  • Saffron Walden County High School
  • Stephen Perse Foundation
  • Chislehurst and Sidcup Grammar School
  • Alleyn's School
  • The Latymer School
  • The British School of Brussels
  • St. Olave's Grammar School
  • Queen Elizabeth's School, Barnet
  • Abingdon Senior School
  • Guiseley School
  • The Haberdashers' Aske's Boys' School
  • Wilson's School
  • Upton Court Grammar School
  • The Judd School
  • St Benedict's Catholic School
  • Roedean School
  • St. Peters School, York
  • Colyton Grammar School
  • Robert Clack School
  • Huish Episcopi Academy
  • London Academy of Excellence Tottenham
  • Beauchamp City Sixth Form
  • The English School
  • Henrietta Barnett School
  • The Thomas Hardye School
  • St Catherine's School, Bramley
  • South Bromsgrove High
  • Wallington County Grammar School
  • Highlands School
  • Maricourt Catholic High School
  • Hutton Church of England Grammar School

Clue for stage 1

Released: 0900 GMT, 10th December 2020

In the long string of numbers formed from the answers to questions 1 to 24 you should see lots of 1 and 2 digit primes. Now think how that might be a code.

Clues for stage 2

Released: 0900 GMT, 11th December 2020

From questions A to H you have another string of digits with lots more 1 and 2 digit primes in there. But this time the code is harder. Look back at all those names in questions 1-24 and A-H. They were chosen for a reason.

Released: After competition entries closed

Ritangle2020 clue 1 Download

Released: After competition entries closed

Ritangle2020 clue 2 Download

Released: After competition entries closed

Ritangle2020 clue 3 Download

Ritangle 2020 Questions


Ritangle 2020 questions


Ritangle 2020 solutions