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 submitting solutions to the live problems is Friday 27 March.
Live problems
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problemFavouriteUnequal Averages
Age11 to 14Challenge level
Play around with sets of five numbers and see what you can discover about different types of average...
Recently solved problems
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problemFavouriteSimplifying Doughnut
Age14 to 16Challenge level
Can you match up these equivalent algebraic expressions?
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problemFavouriteNegative Powers
Age14 to 18Challenge level
What does this number mean? Which order of 1, 2, 3 and 4 makes the highest value? Which makes the lowest?
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problemFavouriteMultiple Surprises
Age11 to 16Challenge level
Sequences of multiples keep cropping up...
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problemFavouriteMore Less Is More
Age7 to 14Challenge level
In each of these games, you will need a little bit of luck and your knowledge of place value to develop a winning strategy.