Live Problems - Stage 3, 4 & 5

Secondary Toughnutslive

Age 11 to 18 Challenge Level:

These secondary problems have not yet been solved. Can you be the first?

Your Number Is...live

Age 7 to 14 Challenge Level:

Think of a number and follow the machine's instructions... I know what your number is! Can you explain how I know?

Twisting and Turninglive

Age 11 to 14 Challenge Level:

Take a look at the video and try to find a sequence of moves that will untangle the ropes.

More Twisting and Turninglive

Age 11 to 16 Challenge Level:

It would be nice to have a strategy for disentangling any tangled ropes...

All Tangled Uplive

Age 14 to 18 Challenge Level:

Can you tangle yourself up and reach any fraction?

Your Number Was...live

Age 11 to 14 Challenge Level:

Think of a number and follow my instructions. Tell me your answer, and I'll tell you what you started with! Can you explain how I know?

Neighbourly Additionlive

Age 7 to 14 Challenge Level:

I added together some of my neighbours house numbers. Can you explain the patterns I noticed?

The Number Jumblerlive

Age 7 to 14 Challenge Level:

The Number Jumbler can always work out your chosen symbol. Can you work out how?