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# Happy Birthday NRICH!

### Always, Sometimes or Never? KS1

### Animated Triangles

### That Number Square

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To celebrate NRICH's 20th birthday, we are bringing together some rich mathematical activities that we think are 'hidden gems'. You may not have come across these tasks before, perhaps because some of them are quite new, whereas others are rather old, but all of them are worth exploring. Get your mathematical thinking hat on!

Age 5 to 7

Challenge Level

Are these statements relating to calculation and properties of shapes always true, sometimes true or never true?

Age 5 to 7

Challenge Level

Watch this "Notes on a Triangle" film. Can you recreate parts of the film using cut-out triangles?

Age 5 to 11

Challenge Level

Exploring the structure of a number square: how quickly can you put the number tiles in the right place on the grid?