Secondary Toughnuts


We sometimes have unsolved problems which require solutions. If there are any below, do consider having a go at them, and send us your solutions.

You may be interested in the article we have written, which explains what we are looking for when we decide which solutions to publish.


Different by One

Age 14 to 16 Challenge Level:

Can you make lines of Cuisenaire rods that differ by 1?

Standard Index Form Matching

Age 14 to 16 Challenge Level:

Can you match these calculations in Standard Index Form with their answers?