Rules of the crossnumber
- One randomly selected correct answer will win a £100 Maths Gear goody bag, including non-transitive dice, a Festival of the Spoken Nerd DVD, and much, much more. Three randomly selected runners up will win a Chalkdust T-shirt. Maths Gear is a website that sells nerdy things worldwide, with free UK shipping.
- To enter, enter the sum of all the digits in the row marked by arrows below by 23 September 2023. Only one entry per person will be accepted. Winners will be notified by email and announced on our blog by 1 October 2023.