What shapes should Elly cut out to make a witch's hat? How can she make a taller hat?
If these balls are put on a line with each ball touching the one in
front and the one behind, which arrangement makes the shortest line
Make a clinometer and use it to help you estimate the heights of
How can you make an angle of 60 degrees by folding a sheet of paper
This practical activity involves measuring length/distance.
Make an equilateral triangle by folding paper and use it to make
patterns of your own.
Using different numbers of sticks, how many different triangles are
you able to make? Can you make any rules about the numbers of
sticks that make the most triangles?
Starting with four different triangles, imagine you have an
unlimited number of each type. How many different tetrahedra can
you make? Convince us you have found them all.
These are pictures of the sea defences at New Brighton. Can you
work out what a basic shape might be in both images of the sea wall
and work out a way they might fit together?
NRICH December 2006 advent calendar - a new tangram for each day in
the run-up to Christmas.
Can you make the most extraordinary, the most amazing, the most
unusual patterns/designs from these triangles which are made in a
Kaia is sure that her father has worn a particular tie twice a week
in at least five of the last ten weeks, but her father disagrees.
Who do you think is right?
Can you make the birds from the egg tangram?
Are all the possible combinations of two shapes included in this
set of 27 cards? How do you know?
More Logo for beginners. Learn to calculate exterior angles and draw regular polygons using procedures and variables.
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
Ideas for practical ways of representing data such as Venn and
An activity making various patterns with 2 x 1 rectangular tiles.
Investigate the smallest number of moves it takes to turn these
mats upside-down if you can only turn exactly three at a time.
Follow the diagrams to make this patchwork piece, based on an
octagon in a square.
Here's a simple way to make a Tangram without any measuring or
This practical problem challenges you to create shapes and patterns
with two different types of triangle. You could even try
Can you fit the tangram pieces into the outline of Little Ming playing the board game?
Can you fit the tangram pieces into the outline of this telephone?
Have a go at drawing these stars which use six points drawn around
a circle. Perhaps you can create your own designs?
Can you fit the tangram pieces into the outline of Little Fung at the table?
Can you fit the tangram pieces into the outline of this brazier for roasting chestnuts?
Can you fit the tangram pieces into the outline of the child walking home from school?
Can you fit the tangram pieces into the outlines of these clocks?
Can you fit the tangram pieces into the outlines of these people?
Take 5 cubes of one colour and 2 of another colour. How many
different ways can you join them if the 5 must touch the table and
the 2 must not touch the table?
Take a counter and surround it by a ring of other counters that
MUST touch two others. How many are needed?
The triangle ABC is equilateral. The arc AB has centre C, the arc
BC has centre A and the arc CA has centre B. Explain how and why
this shape can roll along between two parallel tracks.
Here is a solitaire type environment for you to experiment with. Which targets can you reach?
Looking at the picture of this Jomista Mat, can you decribe what
you see? Why not try and make one yourself?
Let's say you can only use two different lengths - 2 units and 4
units. Using just these 2 lengths as the edges how many different
cuboids can you make?
Can you recreate this Indian screen pattern? Can you make up
similar patterns of your own?
Can you fit the tangram pieces into the outline of this junk?
Can you fit the tangram pieces into the outline of Wai Ping, Wah Ming and Chi Wing?
If you'd like to know more about Primary Maths Masterclasses, this
is the package to read! Find out about current groups in your
region or how to set up your own.
Exploring and predicting folding, cutting and punching holes and
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?
Can you create more models that follow these rules?
How many models can you find which obey these rules?
What is the largest number of circles we can fit into the frame
without them overlapping? How do you know? What will happen if you
try the other shapes?
This is a simple paper-folding activity that gives an intriguing result which you can then investigate further.
In this challenge, you will work in a group to investigate circular
fences enclosing trees that are planted in square or triangular
How can you make a curve from straight strips of paper?
Make new patterns from simple turning instructions. You can have a
go using pencil and paper or with a floor robot.