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.

Cryptarithmslive

Stage: 3 Challenge Level: Challenge Level:1

Can you crack these cryptarithms?

Forwards Add Backwardslive

Stage: 3 Challenge Level: Challenge Level:1

What happens when you add a three digit number to its reverse?

Add to 200live

Stage: 3 Challenge Level: Challenge Level:1

By selecting digits for an addition grid, what targets can you make?

Impossibilitieslive

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

Just because a problem is impossible doesn't mean it's difficult...

Overlapslive

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

Can you find ways to put numbers in the overlaps so the rings have equal totals?

Getting Round the Citylive

Stage: 3 and 4

In a city with a grid system of roads, how do you get from A to B?

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?

An Appearing Act

Stage: 3 and 4

Cut out and reassemble the pieces. Can you explain what happens?