An activity making various patterns with 2 x 1 rectangular tiles.

A game in which players take it in turns to choose a number. Can you block your opponent?

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?

Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.

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?

Arrange 9 red cubes, 9 blue cubes and 9 yellow cubes into a large 3 by 3 cube. No row or column of cubes must contain two cubes of the same colour.

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?

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?

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?

How can you put five cereal packets together to make different shapes if you must put them face-to-face?

These practical challenges are all about making a 'tray' and covering it with paper.

How many models can you find which obey these rules?

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?

Can you each work out the number on your card? What do you notice? How could you sort the cards?

Are all the possible combinations of two shapes included in this set of 27 cards? How do you know?

Our 2008 Advent Calendar has a 'Making Maths' activity for every day in the run-up to Christmas.

NRICH December 2006 advent calendar - a new tangram for each day in the run-up to Christmas.

Can you order pictures of the development of a frog from frogspawn and of a bean seed growing into a plant?

This was a problem for our birthday website. Can you use four of these pieces to form a square? How about making a square with all five pieces?

Can you make the most extraordinary, the most amazing, the most unusual patterns/designs from these triangles which are made in a special way?

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 can you arrange the 5 cubes so that you need the smallest number of Brush Loads of paint to cover them? Try with other numbers of cubes as well.

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?

Delight your friends with this cunning trick! Can you explain how it works?

Factors and Multiples game for an adult and child. How can you make sure you win this game?

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

This practical investigation invites you to make tessellating shapes in a similar way to the artist Escher.

Here is a version of the game 'Happy Families' for you to make and play.

Make your own double-sided magic square. But can you complete both sides once you've made the pieces?

A group of children are discussing the height of a tall tree. How would you go about finding out its height?

Take a counter and surround it by a ring of other counters that MUST touch two others. How many are needed?

Can you make the birds from the egg tangram?

Can you deduce the pattern that has been used to lay out these bottle tops?

In this challenge, you will work in a group to investigate circular fences enclosing trees that are planted in square or triangular arrangements.

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?

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

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.

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 of balls?

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?

This activity investigates how you might make squares and pentominoes from Polydron.

A challenge that requires you to apply your knowledge of the properties of numbers. Can you fill all the squares on the board?

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.

These squares have been made from Cuisenaire rods. Can you describe the pattern? What would the next square look like?

Ideas for practical ways of representing data such as Venn and Carroll diagrams.

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

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