Secondary Live Problems

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.

This set of tasks will stop being live on Monday 9 December. 

A Jar of Teddieslive

Age 7 to 14 Challenge Level:

How many teddies are in the jar? How many teddies could you fit in your classroom?

Flippin' Discslive

Age 11 to 14 Challenge Level:

Discs are flipped in the air. You win if all the faces show the same colour. What is the probability of winning?

Odds and Evenslive

Age 11 to 14 Challenge Level:

Are these games fair? How can you tell?

Cosy Cornerlive

Age 11 to 14 Challenge Level:

Six balls are shaken. You win if at least one red ball ends in a corner. What is the probability of winning?

Two's Companylive

Age 11 to 14 Challenge Level:

Seven balls are shaken. You win if the two blue balls end up touching. What is the probability of winning?

Factorising with Multilinklive

Age 14 to 16 Challenge Level:

Can you find out what is special about the dimensions of rectangles you can make with squares, sticks and units?

Hollow Squareslive

Age 14 to 16 Challenge Level:

Which armies can be arranged in hollow square fighting formations?

Secondary Toughnutslive

Age 11 to 18 Challenge Level:

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