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Reasoning about the number of matches needed to build squares that share their sides.

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You have been given three shapes made out of sponge: a sphere, a cylinder and a cone. Your challenge is to find out how to cut them to make different shapes for printing.

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Make a flower design using the same shape made out of different sizes of paper.

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Can you cut up a square in the way shown and make the pieces into a triangle?

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Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?

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Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.

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Make a cube out of straws and have a go at this practical challenge.

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What are the next three numbers in this sequence? Can you explain why are they called pyramid numbers?

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Have a look at what happens when you pull a reef knot and a granny knot tight. Which do you think is best for securing things together? Why?

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Can you work out what shape is made by folding in this way? Why not create some patterns using this shape but in different sizes?

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This problem invites you to build 3D shapes using two different triangles. Can you make the shapes from the pictures?

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Can you visualise what shape this piece of paper will make when it is folded?

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Exploring and predicting folding, cutting and punching holes and making spirals.

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Paint a stripe on a cardboard roll. Can you predict what will happen when it is rolled across a sheet of paper?

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This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!

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For this task, you'll need an A4 sheet and two A5 transparent sheets. Decide on a way of arranging the A5 sheets on top of the A4 sheet and explore ...

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Choose a box and work out the smallest rectangle of paper needed to wrap it so that it is completely covered.

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Here are more buildings to picture in your mind's eye. Watch out - they become quite complicated!

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How can you paint the faces of these eight cubes so they can be put together to make a 2 x 2 x 2 cube that is green all over AND a 2 x 2 x 2 cube that is yellow all over?

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A game has a special dice with a colour spot on each face. These three pictures show different views of the same dice. What colour is opposite blue?

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Why do you think that the red player chose that particular dot in this game of Seeing Squares?

In this article for primary teachers, Fran describes her passion for paper folding as a springboard for mathematics.

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What shape has Harry drawn on this clock face? Can you find its area? What is the largest number of square tiles that could cover this area?

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Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?

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I've made some cubes and some cubes with holes in. This challenge invites you to explore the difference in the number of small cubes I've used. Can you see any patterns?

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Can you cut a regular hexagon into two pieces to make a parallelogram? Try cutting it into three pieces to make a rhombus!

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What shape is made when you fold using this crease pattern? Can you make a ring design?

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How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?

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Here are the six faces of a cube - in no particular order. Here are three views of the cube. Can you deduce where the faces are in relation to each other and record them on the net of this cube?

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Imagine a 3 by 3 by 3 cube made of 9 small cubes. Each face of the large cube is painted a different colour. How many small cubes will have two painted faces? Where are they?

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What is the smallest cuboid that you can put in this box so that you cannot fit another that's the same into it?

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Can you predict when you'll be clapping and when you'll be clicking if you start this rhythm? How about when a friend begins a new rhythm at the same time?

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What happens to the area of a square if you double the length of the sides? Try the same thing with rectangles, diamonds and other shapes. How do the four smaller ones fit into the larger one?

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One face of a regular tetrahedron is painted blue and each of the remaining faces are painted using one of the colours red, green or yellow. How many different possibilities are there?

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Imagine a 4 by 4 by 4 cube. If you and a friend drill holes in some of the small cubes in the ways described, how many will not have holes drilled through them?

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Can you fit the tangram pieces into the outline of the candle?

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Can you fit the tangram pieces into the outline of the butterfly?

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An activity centred around observations of dots and how we visualise number arrangement patterns.

This article looks at levels of geometric thinking and the types of activities required to develop this thinking.

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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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Can you fit the tangram pieces into the outline of the house?

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Can you fit the tangram pieces into the outline of the telephone?

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Can you fit the tangram pieces into the outline of this teacup?

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Can you fit the tangram pieces into the outlines of the telescope and microscope?

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Take a rectangle of paper and fold it in half, and half again, to make four smaller rectangles. How many different ways can you fold it up?

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Can you fit the tangram pieces into the outline of Little Fung at the table?

Explore our selection of interactive tangrams. Can you use the tangram pieces to re-create each picture?

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How many different triangles can you make on a circular pegboard that has nine pegs?