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 submitting solutions to these live problems is Monday 3 March.
Live problems
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problem
Pairs of numbers
If you have ten counters numbered 1 to 10, how many can you put into pairs that add to 10? Which ones do you have to leave out? Why?
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problem
Name that triangle!
Can you sketch triangles that fit in the cells in this grid? Which ones are impossible? How do you know?
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problem
Compare the calculations
Can you put these four calculations into order of difficulty? How did you decide?
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problem
Times tables shifts
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
Recently solved problems
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problem
Take three numbers
What happens when you add three numbers together? Will your answer be odd or even? How do you know?
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problem
Holes
I've made some cubes and some cubes with holes in. This challenge invites you to explore the difference in the number of small cubes I've used. Can you see any patterns?
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problem
Lots of lollies
Frances and Rishi were given a bag of lollies. They shared them out evenly and had one left over. How many lollies could there have been in the bag?
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problem
Round the three dice
What happens when you round these three-digit numbers to the nearest 100?