November 2019 Webinar

On November 13 2019 we will be hosting a webinar on this page. For more details, please visit

When you sign in to the chat, please introduce yourself with name of school, where you are located, and how many students there are in your class.

Please do not post solutions in the chat, as it may spoil the problem for other participants! If you have a solution to share, use the link below.

Submit a solution
By uploading your solution you are giving us permission to publish your work, either as a whole or edited extracts, on the NRICH website, on the NRICH YouTube Channel, and in associated educational materials for students and teachers, at our discretion.

For our full terms of use regarding submitted solutions and user contributions please see

Your information (first name, school name etc) is optional. If supplied, it may be used for attribution purposes only if your work is published on the website. Data that you supply on this form (e.g. age if supplied, location if supplied) may also be anonymised and used for evaluation and reporting.

For more information about the University's policies and procedures on handling personal information, and your rights under data protection legislation, please see