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Prime Magic
Place the numbers 1, 2, 3,..., 9 one on each square of a 3 by 3 grid so that all the rows and columns add up to a prime number. How many different solutions can you find?
Got It Article
This article gives you a few ideas for understanding the Got It! game and how you might find a winning strategy.
Clever Carl
What would you do if your teacher asked you add all the numbers from 1 to 100? Find out how Carl Gauss responded when he was asked to do just that.
Age 7 to 11 Challenge Level:
This challenge is best done in a group of at least four and preferably more.
You'll need to print out this sheet cut into fifteen separate cards.
Share the cards out amongst the group.
Can you each work out the number on your card? What do you notice?
How could you sort the cards?
You may like to try using this sheet of twenty cards in the same way, which contain slightly harder questions.
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NRICH is part of the family of activities in the Millennium Mathematics Project.
NRICH is part of the family of activities in the Millennium Mathematics Project.