Each time students visit the NRICH site there will be some activities which are 'live'. That means we are inviting students to send us their solutions and we will publish a selection of them, along with their name and school's name. If you'd like to know more about what we're looking for, read this short article.
The last day for sending in solutions to these live problems is Monday 27 November.
list
Secondary Toughnuts
Age
11 to 18
Challenge level
These secondary problems have not yet been solved. Can you be the first?
problem
Favourite
Take Three From Five
Age
11 to 16
Challenge level
Caroline and James pick sets of five numbers. Charlie tries to find three that add together to make a multiple of three. Can they stop him?
problem
Favourite
Cuboid challenge
Age
11 to 16
Challenge level
What's the largest volume of box you can make from a square of paper?
problem
Favourite
Slick Summing
Age
14 to 16
Challenge level
Watch the video to see how Charlie works out the sum. Can you adapt his method?