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problem

ABC

7 to 11

In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks. Can you reconstruct the original multiplication?

article

Enriching Data Handling

5 to 11

This article for teachers looks at some suggestions taken from the NRICH website that offer a broad view of data and ask some more probing questions about it.

problem

Clock Squares

14 to 18

Can you find a way of predicting the value of large square numbers with the help of our power modulo calculator?

problem

Proper Factors

16 to 18

Can you find the smallest integer which has exactly 426 proper factors?

problem

Ishango Bone

7 to 18

Can you decode the mysterious markings on this ancient bone tool?

problem

Galley Division

14 to 16

Can you explain how Galley Division works?

problem

Tray Bake

11 to 14

My recipe is for 12 cakes - how do I change it if I want to make a different number of cakes?

problem

Food Web

11 to 14

Is this eco-system sustainable?

problem

Robot Camera

14 to 16

Could nanotechnology be used to see if an artery is blocked? Or is this just science fiction?

problem

Gibraltar Geometry

11 to 14

Take a look at the photos of tiles at a school in Gibraltar. What questions can you ask about them?