The problems in this feature introduce the idea of modular (or clock) arithmetic, and encourage you to explore the modular world. There are opportunities for noticing patterns and discovering some general rules which hold in this type of arithmetic.
You can build on these ideas when exploring our Public Key Cryptography Interactivity, and see how Public Keys are used to keep our personal information secure.
You can watch a recording of the webinar in which we discussed the mathematical thinking which can be prompted by these problems.
The last day for sending in solutions to our live problems is Monday 17 May.