Sharpen your neurons with the maths test just taken by 300,000 UK school pupils

Hello guzzlers.

Today youll be attempting questions from a maths test that 300,000 Britons aged 11 to 13 took just over a week ago. (Thats years 7 and 8 in England and equivalent years in Scotland and Northern Ireland).

The United Kingdom Mathematics Trusts annual Junior Challenge aims to get students excited about maths with 25 appetising and intriguing problems to be solved in an hour. Ive chosen my favourite ten below, and Im giving you no more than 25 minutes to solve them. Did you hear that at the back? You might find the first ones easy, but Im expecting ten out of ten.

Ill be back at 5pm BST today with full explanations of the answers and Ill also compare your marks with the marks of the pupils who sat the test. If you are reading this on mobile, click **+Follow Alex Bellos** above and youll get a notification when the update appears.

**Please make a note of your answers. When you press submit the screen will reveal the correct answers, but not mark individual submissions.**

*On some devices the image for Q4 is stretching. The image should show that the top angle of triangle C, the bottom left angle of triangle D, and the bottom angle of triangle E are right angles.*

*Thanks to the United Kingdom Mathematics Trust for letting me reprint these problems. Schools wanting to participate in their national challenges can find out how to do so here.*

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*I post a puzzle here on a Monday every two weeks.*

*Im the author of three popular maths books including Alexs Adventures in Numberland and the maths colouring book Snowflake Seashell Star. *

*You can check me out on Twitter, Facebook, Google+ and my personal website.*

*And if know of any great puzzles that you would like me to set here, get in touch.*