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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 these live problems is Monday 29 April.
Try out this number trick. What happens with different starting numbers? What do you notice?
Nearly all of us have made table patterns on hundred squares, that is 10 by 10 grids. This problem looks at the patterns on differently sized square grids.
Take a look at these recently solved problems.
Are these statements relating to calculation and properties of shapes always true, sometimes true or never true?
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
This multiplication uses each of the digits 0 - 9 once and once only. Using the information given, can you replace the stars in the calculation with figures?
Which pairs of cogs let the coloured tooth touch every tooth on the other cog? Which pairs do not let this happen? Why?