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### Number and algebra

### Geometry and measure

### Probability and statistics

### Working mathematically

### For younger learners

### Advanced mathematics

# Video List

### The Best Card Trick?

### Take Three from Five

### Cyclic Quad Jigsaw

### Seven Squares - Group-worthy Task

### Factorising with Multilink

### Always a Multiple?

### Whirlyball

### Method in Multiplying Madness?

### Symmetric Tangles

### ACE, TWO, THREE...

### Twisting and Turning

### Impossible Triangles?

### Strike it Out

### Speedy Summations

### Slick Summing

### Modular Origami Polyhedra

### Kingsfield School - Building on Rich Starting Points

### Drawing Celtic Knots

### Turning the Place Over

### How Many?

### Jo Boaler Explains Complex Instruction

### Dotty Six

### Bryony's Triangle

### Take One Example

### Constructing Triangles

### James's Code Challenge

### Summing Consecutive Numbers

### Angle Trisection

### Beelines

### Shopping Basket

### Daisy

### Nim-7

### Totality

### Frogs

### Counting Cards

### Painted Cube

### Air Nets

### Power Countdown

### Sociable Cards

### All Change

### Summing Geometric Progressions

### Seven Squares

### Sorted

### Perimeter Possibilities

### A Brief Introduction to Complex Numbers

### Tasks Promoting InquiryLive

### Strange Bank Account

### Up, Down, Flying Around

### Strike it Out for Two

### Dotty Six for Two

### Rhombuses from Diagonals

### Areas on a Grid

### Sketching Graphs - Transformations

### Subtraction Surprise

### Roll over the Dice

### How Risky is My Diet?

### Statins and Risk

### Probability in Court

### The ELISA Test

### Vanishing Roots

### Pouring Problem

### Eightness of Eight

### Tumbling Down

### Bundles of Cubes

### Truth or Lie

### Unexpected Ordering

### Surprising Split

### Subtraction Slip

Links to the University of Cambridge website
Links to the NRICH website Home page

Nurturing young mathematicians: teacher webinars

30 April (Primary), 1 May (Secondary)

30 April (Primary), 1 May (Secondary)

Or search by topic

Age 11 to 16

Challenge Level

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?

Age 11 to 16

Challenge Level

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

Age 14 to 16

Challenge Level

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?

Age 11 to 14

Challenge Level

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?

Age 14 to 16

Challenge Level

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

Age 11 to 14

Challenge Level

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

Age 16 to 18

Challenge Level

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

Age 7 to 14

Challenge Level

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

Age 14 to 16

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

Age 11 to 14

Challenge Level

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

Age 11 to 14

Challenge Level

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

Age 16 to 18

Challenge Level

Which of these triangular jigsaws are impossible to finish?

Age 5 to 11

Challenge Level

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

Age 16 to 18

Challenge Level

Watch the video to see how to add together an arithmetic sequence of numbers efficiently.

Age 14 to 16

Challenge Level

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

Age 7 to 16

Challenge Level

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

Age 5 to 18

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.

Age 11 to 14

Challenge Level

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

Age 11 to 18

Challenge Level

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?

Age 5 to 7

Challenge Level

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

Age 5 to 18

Challenge Level

A video clip of Jo Boaler talking about Complex Instruction.

Age 5 to 11

Challenge Level

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

Age 7 to 11

Challenge Level

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?

Age 5 to 11

This article introduces the idea of generic proof for younger children and illustrates how one example can offer a proof of a general result through unpacking its underlying structure.

Age 11 to 14

Challenge Level

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

Age 7 to 18

Challenge Level

The Enigma Project's James Grime has created a video code challenge. Watch it here!

Age 11 to 14

Challenge Level

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?

Age 14 to 16

Challenge Level

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

Age 14 to 16

Challenge Level

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

Age 11 to 16

Challenge Level

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

Age 7 to 11

Challenge Level

In this game for two players, take it in turns to shade one petal, or two petals next to each other. Is it better to go first or second?

Age 5 to 11

Challenge Level

Can you work out how to win this game of Nim? Does it matter if you go first or second?

Age 5 to 11

Challenge Level

This is an adding game for two players. Can you be the first to reach the target?

Age 11 to 14

Challenge Level

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

Age 7 to 11

Challenge Level

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?

Age 14 to 16

Challenge Level

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?

Age 7 to 18

Challenge Level

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

Age 14 to 16

Challenge Level

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

Age 11 to 14

Challenge Level

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

Age 5 to 7

Challenge Level

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?

Age 14 to 18

Challenge Level

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

Age 11 to 14

Challenge Level

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

Age 14 to 18

Challenge Level

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

Age 11 to 14

Challenge Level

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

Age 14 to 18

Challenge Level

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

Age 11 to 18

Challenge Level

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

Age 11 to 14

Challenge Level

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

Age 11 to 14

Challenge Level

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

Age 5 to 11

Challenge Level

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

Age 5 to 11

Challenge Level

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

Age 11 to 16

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

Age 11 to 16

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

Age 16 to 18

Challenge Level

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

Age 7 to 14

Challenge Level

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

Age 7 to 11

Challenge Level

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?

Age 11 to 16

Challenge Level

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

Age 14 to 16

Challenge Level

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

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

Age 14 to 18

Challenge Level

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

Age 14 to 18

Challenge Level

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?

Age 14 to 18

If $y=x^2-6x+c$, and we vary $c$, what happens to the roots when $c>9$?

Age 7 to 11

Challenge Level

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

Age 5 to 7

Challenge Level

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

Age 7 to 11

Challenge Level

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

Age 7 to 11

Challenge Level

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

Age 7 to 11

Challenge Level

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

Age 5 to 7

Challenge Level

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

Age 7 to 11

Challenge Level

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

Age 5 to 7

Challenge Level

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