Each time you visit the NRICH site there are usually 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
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problemFavouriteHunting for Averages
Age7 to 11Challenge level
1 out of 3
Can you find the missing number(s)? The square is the average (mean) of the numbers surrounding it.
Recently solved problems
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gameFavouriteDicey Operations
Age7 to 14Challenge level
1 out of 3
In these addition and subtraction games, you'll need to think strategically to get closest to the target.
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problemFavouriteMaking Sticks
Age5 to 7Challenge level
2 out of 3
Kimie and Sebastian were making sticks from interlocking cubes and lining them up. Can they make their lines the same length? Can they make any other lines?
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problemFavouriteDoughnut Percents
Age7 to 14Challenge level
2 out of 3
Can you make doughnuts by matching these fractions, decimals and percentages?
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problemFavouritePlay to 37
Age7 to 11Challenge level
1 out of 3
In this game the winner is the first to make the total 37. Is this a fair game?