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
Picturing Square Numbers
Age
11 to 14
Challenge level
Square numbers can be represented as the sum of consecutive odd numbers. What is the sum of 1 + 3 + ..... + 149 + 151 + 153?
problem
Favourite
Quadratic Patterns
Age
14 to 16
Challenge level
Surprising numerical patterns can be explained using algebra and diagrams...