The computer has made a rectangle and will tell you the number of spots it uses in total. Can you find out where the rectangle is?

An environment that enables you to investigate tessellations of regular polygons

Choose the size of your pegboard and the shapes you can make. Can you work out the strategies needed to block your opponent?

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?

What shaped overlaps can you make with two circles which are the same size?

Ahmed has some wooden planks to use for three sides of a rabbit run against the shed. What quadrilaterals would he be able to make with the planks of different lengths?

Can you put the 25 coloured tiles into the 5 x 5 square so that no column, no row and no diagonal line have tiles of the same colour in them?

Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.

Place six toy ladybirds into the box so that there are two ladybirds in every column and every row.

A game for two people, or play online. Given a target number, say 23, and a range of numbers to choose from, say 1-4, players take it in turns to add to the running total to hit their target.

A game for 2 players that can be played online. Players take it in turns to select a word from the 9 words given. The aim is to select all the occurrences of the same letter.

Is it possible to place 2 counters on the 3 by 3 grid so that there is an even number of counters in every row and every column? How about if you have 3 counters or 4 counters or....?

Calculate the fractional amounts of money to match pairs of cards with the same value.

A train building game for two players. Can you be the one to complete the train?

What is the greatest number of squares you can make by overlapping three squares?

Place the numbers 1 to 10 in the circles so that each number is the difference between the two numbers just below it.

This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?

Each light in this interactivity turns on according to a rule. What happens when you enter different numbers? Can you find the smallest number that lights up all four lights?

This game challenges you to locate hidden triangles in The White Box by firing rays and observing where the rays exit the Box.

A simple spinner that is equally likely to land on Red or Black. Useful if tossing a coin, dropping it, and rummaging about on the floor have lost their appeal. Needs a modern browser; if IE then at. . . .

Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.

The 2012 primary advent calendar features twenty-four of our posters, one for each day in the run-up to Christmas.

In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?

Train game for an adult and child. Who will be the first to make the train?

Seeing Squares game for an adult and child. Can you come up with a way of always winning this game?

Stop the Clock game for an adult and child. How can you make sure you always win this game?

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

There are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?

A game for two people that can be played with pencils and paper. Combine your knowledge of coordinates with some strategic thinking.

Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?

Investigate how the four L-shapes fit together to make an enlarged L-shape. You could explore this idea with other shapes too.

Play this well-known game against the computer where each player is equally likely to choose scissors, paper or rock. Why not try the variations too?

Can you complete this jigsaw of the multiplication square?

Watch this film carefully. Can you find a general rule for explaining when the dot will be this same distance from the horizontal axis?

This is a game for two players. Can you find out how to be the first to get to 12 o'clock?

Can you match pairs of fractions, decimals and percentages, and beat your previous scores?

Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.

Practise your number bonds whilst improving your memory in this matching pairs game.

This article gives you a few ideas for understanding the Got It! game and how you might find a winning strategy.

Can you find a reliable strategy for choosing coordinates that will locate the treasure in the minimum number of guesses?

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

Add or subtract the two numbers on the spinners and try to complete a row of three. Are there some numbers that are good to aim for?

Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?