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It is impossible to trisect an angle using only ruler and compasses but it can be done using a carpenter's square.

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As part of Liverpool08 European Capital of Culture there were a huge number of events and displays. One of the art installations was called "Turning the Place Over". Can you find our how it works?

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Here is a chance to create some Celtic knots and explore the mathematics behind them.

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Video showing how to use the Number Plumber

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Generate three random numbers to determine the side lengths of a triangle. What triangles can you draw?

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Is there a relationship between the coordinates of the endpoints of a line and the number of grid squares it crosses?

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Choose a couple of the sequences. Try to picture how to make the next, and the next, and the next... Can you describe your reasoning?

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Think of a two digit number, reverse the digits, and add the numbers together. Something special happens...

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Caroline and James pick sets of five numbers. Charlie chooses three of them that add together to make a multiple of three. Can they stop him?

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Can you find out what is special about the dimensions of rectangles you can make with squares, sticks and units?

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Can you visualise whether these nets fold up into 3D shapes? Watch the videos each time to see if you were correct.

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Watch these videos to see how Phoebe, Alice and Luke chose to draw 7 squares. How would they draw 100?

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Try out some calculations. Are you surprised by the results?

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The items in the shopping basket add and multiply to give the same amount. What could their prices be?

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Watch the video to see how Charlie works out the sum. Can you adapt his method?

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How many moves does it take to swap over some red and blue frogs? Do you have a method?

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Watch the video to see how to sum the sequence. Can you adapt the method to sum other sequences?

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Play this game to learn about adding and subtracting positive and negative numbers

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In this twist on the well-known Countdown numbers game, use your knowledge of Powers and Roots to make a target.

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Imagine a very strange bank account where you are only allowed to do two things...

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How can you quickly sort a suit of cards in order from Ace to King?

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In this problem, we define complex numbers and invite you to explore what happens when you add and multiply them.

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In 1% of cases, an HIV test gives a positive result for someone who is HIV negative. How likely is it that someone who tests positive has HIV?

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Move your counters through this snake of cards and see how far you can go. Are you surprised by where you end up?

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Newspapers said that eating a bacon sandwich every day raises the risk of bowel cancer by 20%. Should you be concerned?

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Time for a little mathemagic! Choose any five cards from a pack and show four of them to your partner. How can they work out the fifth?

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Can you picture how to order the cards to reproduce Charlie's card trick for yourself?

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15 = 7 + 8 and 10 = 1 + 2 + 3 + 4. Can you say which numbers can be expressed as the sum of two or more consecutive integers?

Take a look at the video showing areas of different shapes on dotty grids...

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Video for teachers of a talk given by Dan Meyer in Cambridge in March 2013.

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"Statins cut the risks of heart attacks and strokes by 40%"

Should the Professor take statins? Can you help him decide?

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When you're on trial for murder, it can be crucial that the court understands probability...

Take a look at the video showing rhombuses and their diagonals...

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Watch our videos of multiplication methods that you may not have met before. Can you make sense of them?

Alf and Tracy explain how the Kingsfield School maths department use common tasks to encourage all students to think mathematically about key areas in the curriculum.

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I'm thinking of a rectangle with an area of 24. What could its perimeter be?

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Take a look at the video and try to find a sequence of moves that will untangle the ropes.

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These models have appeared around the Centre for Mathematical Sciences. Perhaps you would like to try to make some similar models of your own.

The tangles created by the twists and turns of the Conway rope trick are surprisingly symmetrical. Here's why!

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A picture is made by joining five small quadrilaterals together to make a large quadrilateral. Is it possible to draw a similar picture if all the small quadrilaterals are cyclic?