Using your knowledge of the properties of numbers, can you fill all the squares on the board?
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?
Factors and Multiples game for an adult and child. How can you make sure you win this game?
Can you each work out the number on your card? What do you notice? How could you sort the cards?
NRICH December 2006 advent calendar - a new tangram for each day in the run-up to Christmas.
Imagine you have an unlimited number of four types of triangle. How many different tetrahedra can you make?
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?
What is the greatest number of counters you can place on the grid below without four of them lying at the corners of a square?
What is the smallest cuboid that you can put in this box so that you cannot fit another that's the same into it?
How many triangles can you make on the 3 by 3 pegboard?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
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?
How can you put five cereal packets together to make different shapes if you must put them face-to-face?
How many models can you find which obey these rules?
These practical challenges are all about making a 'tray' and covering it with paper.
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?
Our 2008 Advent Calendar has a 'Making Maths' activity for every day in the run-up to Christmas.
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?
The ancient Egyptians were said to make right-angled triangles using a rope with twelve equal sections divided by knots. What other triangles could you make if you had a rope like this?
An activity making various patterns with 2 x 1 rectangular tiles.
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?
A game in which players take it in turns to choose a number. Can you block your opponent?
Ideas for practical ways of representing data such as Venn and Carroll diagrams.
Where can you put the mirror across the square so that you can still "see" the whole square? How many different positions are possible?
Can you fit the tangram pieces into the outline of Granma T?
Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?
Here's a simple way to make a Tangram without any measuring or ruling lines.
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
Can you make the birds from the egg tangram?
Exploring and predicting folding, cutting and punching holes and making spirals.
Use the interactivity to play two of the bells in a pattern. How do you know when it is your turn to ring, and how do you know which bell to ring?
This problem invites you to build 3D shapes using two different triangles. Can you make the shapes from the pictures?
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
Cut a square of paper into three pieces as shown. Now,can you use the 3 pieces to make a large triangle, a parallelogram and the square again?
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?
What do these two triangles have in common? How are they related?
Make a cube out of straws and have a go at this practical challenge.
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 fit the tangram pieces into the outline of Wai Ping, Wah Ming and Chi Wing?
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?
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?
Have a go at drawing these stars which use six points drawn around a circle. Perhaps you can create your own designs?
Here are some ideas to try in the classroom for using counters to investigate number patterns.
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.
Follow the diagrams to make this patchwork piece, based on an octagon in a square.
We went to the cinema and decided to buy some bags of popcorn so we asked about the prices. Investigate how much popcorn each bag holds so find out which we might have bought.
Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?
This practical problem challenges you to create shapes and patterns with two different types of triangle. You could even try overlapping them.