List

Live problems - Stage 3, 4 and 5

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

The last day for sending in solutions to these live problems is Monday 27 November.

Dozens
problem
Favourite

Dozens

Age
7 to 14
Challenge level
filled star empty star empty star

Can you select the missing digit(s) to find the largest multiple?

Fruity Totals
problem
Favourite

Fruity totals

Age
7 to 16
Challenge level
filled star empty star empty star

In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?

Secondary Toughnuts
list

Secondary Toughnuts

Age
11 to 18
Challenge level
filled star empty star empty star
These secondary problems have not yet been solved. Can you be the first?
Have you got it?
problem
Favourite

Have you got it?

Age
11 to 14
Challenge level
filled star empty star empty star

Can you explain the strategy for winning this game with any target?

Connect Three
problem
Favourite

Connect three

Age
11 to 16
Challenge level
filled star filled star empty star

In this game the winner is the first to complete a row of three. Are some squares easier to land on than others?

crossing the bridge
problem

Crossing the bridge

Age
11 to 18
Challenge level
filled star filled star empty star

Four friends must cross a bridge. How can they all cross it in just 17 minutes?