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?

Into the Wildernesslive

Stage: 4 and 5 Challenge Level: Challenge Level:2 Challenge Level:2

Let's go further and see what happens when we multiply two complex numbers together!

Complex Puzzlelive

Stage: 4 and 5 Challenge Level: Challenge Level:2 Challenge Level:2

Can you use everything you have learned about complex numbers to crack this puzzle?

Mapping the Territorylive

Stage: 4 and 5 Challenge Level: Challenge Level:2 Challenge Level:2

Can you devise a system for making sense of complex multiplication?