Live Problems - Stage 4 & 5

Each time you visit the NRICH site there will be some activities which are 'live'. That means we are inviting you to send us your solutions and we will publish a selection of them, along with your name and school. If you'd like to read more about what we're looking for, read this short article.

Stage 4 & 5 Toughnutslive

Stage: 5 Challenge Level: Challenge Level:1

These Stage 4 and 5 problems haven't been solved yet. Can you be the first?

Strolling Alonglive

Stage: 4 and 5 Challenge Level: Challenge Level:1

What happens when we multiply a complex number by a real or an imaginary number?

Opening the Doorlive

Stage: 4 and 5 Challenge Level: Challenge Level:1

What happens when we add together two complex numbers?