You may also like

problem icon

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?

problem icon

Got It Article

This article gives you a few ideas for understanding the Got It! game and how you might find a winning strategy.

problem icon

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.

Sort Them Out (2)

Stage: 2 Challenge Level: Challenge Level:1

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.
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
Copyright © 1997 - 2018. University of Cambridge. All rights reserved.
NRICH is part of the family of activities in the Millennium Mathematics Project.