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?

Inner Equalitylive

Stage: 5 Short Challenge Level: Challenge Level:1

Can you solve this inequalities challenge?

Unit Intervallive

Stage: 5 Short Challenge Level: Challenge Level:1

Can you prove our inequality holds for all values of x and y between 0 and 1?

Classical Meanslive

Stage: 5 Challenge Level: Challenge Level:1

Use the diagram to investigate the classical Pythagorean means.

In Betweenlive

Stage: 5 Challenge Level: Challenge Level:2 Challenge Level:2

Can you find the solution to this algebraic inequality?