There are **80** NRICH Mathematical resources connected to **Video**, you may find related items under Physical and Digital Manipulatives.

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Can you spot the mistake in this video? How would you work out the answer to this calculation?

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Watch this animation. What do you see? Can you explain why this happens?

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What do you see as you watch this video? Can you create a similar video for the number 12?

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What do you think is going to happen in this video clip? Are you surprised?

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

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

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

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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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There are three versions of this challenge. The idea is to change the colour of all the spots on the grid. Can you do it in fewer throws of the dice?

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Watch the video to see how to fold a square of paper to create a flower. What fraction of the piece of paper is the small triangle?

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Dotty Six is a simple dice game that you can adapt in many ways.

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This project challenges you to work out the number of cubes hidden under a cloth. What questions would you like to ask?

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Use your addition and subtraction skills, combined with some strategic thinking, to beat your partner at this game.

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

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Whirl a conker around in a horizontal circle on a piece of string. What is the smallest angular speed with which it can whirl?

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Imagine a large cube made from small red cubes being dropped into a pot of yellow paint. How many of the small cubes will have yellow paint on their faces?

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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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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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A magician took a suit of thirteen cards and held them in his hand face down. Every card he revealed had the same value as the one he had just finished spelling. How did this work?

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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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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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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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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?

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Does this 'trick' for calculating multiples of 11 always work? Why or why not?

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Watch the video of Fran re-ordering these number cards. What do you notice? Try it for yourself. What happens?

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Take a look at the video of this trick. Can you perform it yourself? Why is this maths and not magic?

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Watch this animation. What do you notice? What happens when you try more or fewer cubes in a bundle?

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

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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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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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Watch this video to see how to roll the dice. Now it's your turn! What do you notice about the dice numbers you have recorded?

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If you can sketch y=f(x), there are several related functions you can also sketch...

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

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

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Dotty Six game for an adult and child. Will you be the first to have three sixes in a straight line?

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Strike it Out game for an adult and child. Can you stop your partner from being able to go?

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

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

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