What shape is made when you fold using this crease pattern? Can you make a ring design?
Can you cut a regular hexagon into two pieces to make a parallelogram? Try cutting it into three pieces to make a rhombus!
A group activity using visualisation of squares and triangles.
This problem invites you to build 3D shapes using two different triangles. Can you make the shapes from the pictures?
Paint a stripe on a cardboard roll. Can you predict what will happen when it is rolled across a sheet of paper?
Can you visualise what shape this piece of paper will make when it is folded?
What is the greatest number of squares you can make by overlapping three squares?
Make a flower design using the same shape made out of different sizes of paper.
What are the next three numbers in this sequence? Can you explain why are they called pyramid numbers?
Can you cut up a square in the way shown and make the pieces into a triangle?
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?
In how many ways can you fit two of these yellow triangles together? Can you predict the number of ways two blue triangles can be fitted together?
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 ...
Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?
Draw three straight lines to separate these shapes into four groups - each group must contain one of each shape.
Exploring and predicting folding, cutting and punching holes and making spirals.
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
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.
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?
Make a cube out of straws and have a go at this practical challenge.
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?
What is the total area of the four outside triangles which are outlined in red in this arrangement of squares inside each other?
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?
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?
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?
What shape is the overlap when you slide one of these shapes half way across another? Can you picture it in your head? Use the interactivity to check your visualisation.
Here are more buildings to picture in your mind's eye. Watch out - they become quite complicated!
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?
How can you make an angle of 60 degrees by folding a sheet of paper twice?
How many different triangles can you make on a circular pegboard that has nine pegs?
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?
Reasoning about the number of matches needed to build squares that share their sides.
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?
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?
What is the smallest cuboid that you can put in this box so that you cannot fit another that's the same into it?
Why do you think that the red player chose that particular dot in this game of Seeing Squares?
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?
In this article for primary teachers, Fran describes her passion for paper folding as a springboard for mathematics.
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?
Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?
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?
Investigate how the four L-shapes fit together to make an enlarged L-shape. You could explore this idea with other shapes too.
Which of these dice are right-handed and which are left-handed?
Can you fit the tangram pieces into the outline of Granma T?
Can you fit the tangram pieces into the outline of the telephone?
A game for 2 players. Given a board of dots in a grid pattern, players take turns drawing a line by connecting 2 adjacent dots. Your goal is to complete more squares than your opponent.
An irregular tetrahedron is composed of four different triangles. Can such a tetrahedron be constructed where the side lengths are 4, 5, 6, 7, 8 and 9 units of length?
Billy's class had a robot called Fred who could draw with chalk held underneath him. What shapes did the pupils make Fred draw?
Can you fit the tangram pieces into the outlines of the convex shapes?