These three brainteasers challenge students to be resourceful, to think logically and to work systematically. They are designed to be accessible to secondary maths students at Key Stages 3 and 4.
Detailed teachers' notes for this activity are available on our NRICH website.
Further information
If you're finding hard to get started, try looking at this hint on our NRICH website.
Detailed teachers' notes for this activity are available on our NRICH website, where you can also find the solution.
Related activities
If you enjoyed this you might also like our KS3 activity Medal Muddle.
