Each time you visit the NRICH site there will be some activities which are 'live'. This means we are inviting students to send us solutions, and we will publish a selection of them, along with each student's name and their school, a few weeks later. If you'd like to know more about what we're looking for, read this short article.
The last day for sending solutions to the live problems is Friday 17 July.
Live problems
-
problemFavouriteConnecting Averages
Age11 to 16Challenge level
1 out of 3
The number in the square is the mean of the four numbers surrounding it. Can you find the missing numbers?
Recently solved problems
-
problemFavouriteUnequal Averages
Age11 to 14Challenge level
2 out of 3
Play around with sets of five numbers and see what you can discover about different types of average...
-
problemFavouriteIsosceles Triangles
Age11 to 14Challenge level
1 out of 3
Draw some isosceles triangles with an area of $9cm^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?
-
problemFavouriteMore Less Is More
Age7 to 14Challenge level
1 out of 3
In each of these games, you will need a little bit of luck and your knowledge of place value to develop a winning strategy.
-
problemFavouriteSimplifying Doughnut
Age14 to 16Challenge level
2 out of 3
Can you match up these equivalent algebraic expressions?
-
problemFavouriteNegative Powers
Age14 to 18Challenge level
2 out of 3
What does this number mean? Which order of 1, 2, 3 and 4 makes the highest value? Which makes the lowest?
-
problemFavouriteMultiple Surprises
Age11 to 16Challenge level
1 out of 3
Sequences of multiples keep cropping up...