Live Problems - Stage 3 & 4

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.

Satisfying Statementslive

Stage: 2 and 3 Challenge Level: Challenge Level:1

Can you find any two-digit numbers that satisfy all of these statements?

Charlie's Delightful Machinelive

Stage: 3 and 4 Challenge Level: Challenge Level:1

Here is a machine with four coloured lights. Can you develop a strategy to work out the rules controlling each light?

A Little Light Thinkinglive

Stage: 4 Challenge Level: Challenge Level:1

Here is a machine with four coloured lights. Can you make two lights switch on at once? Three lights? All four lights?

Which Spinners?live

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

Can you work out which spinners were used to generate the frequency charts?

Stage 3 and 4 Toughnutslive

Stage: 3 Challenge Level: Challenge Level:1

These Stage 3 and 4 problems have not yet been solved. Can you be the first?