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Seven balls are shaken. You win if the two blue balls end up touching. What is the probability of winning?

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Can you work out which spinners were used to generate the frequency charts?

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Discs are flipped in the air. You win if all the faces show the same colour. What is the probability of winning?

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This interactivity invites you to make conjectures and explore probabilities of outcomes related to two independent events.

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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. . . .

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Six balls are shaken. You win if at least one red ball ends in a corner. What is the probability of winning?

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A counter is placed in the bottom right hand corner of a grid. You toss a coin and move the star according to the following rules: ... What is the probability that you end up in the top left-hand. . . .

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Use an interactive Excel spreadsheet to explore number in this exciting game!

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Use an Excel to investigate division. Explore the relationships between the process elements using an interactive spreadsheet.

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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?

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The interactive diagram has two labelled points, A and B. It is designed to be used with the problem "Cushion Ball"

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An environment which simulates working with Cuisenaire rods.

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Use Excel to investigate the effect of translations around a number grid.

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Use Excel to explore multiplication of fractions.

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A simple file for the Interactive whiteboard or PC screen, demonstrating equivalent fractions.

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Use Excel to practise adding and subtracting fractions.

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An Excel spreadsheet with an investigation.

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Use an Excel spreadsheet to explore long multiplication.

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Use an interactive Excel spreadsheet to investigate factors and multiples.

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A red square and a blue square overlap so that the corner of the red square rests on the centre of the blue square. Show that, whatever the orientation of the red square, it covers a quarter of the. . . .

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This is an interactivity in which you have to sort the steps in the completion of the square into the correct order to prove the formula for the solutions of quadratic equations.

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The aim of the game is to slide the green square from the top right hand corner to the bottom left hand corner in the least number of moves.

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Can you explain the strategy for winning this game with any target?

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This problem is about investigating whether it is possible to start at one vertex of a platonic solid and visit every other vertex once only returning to the vertex you started at.

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Place a red counter in the top left corner of a 4x4 array, which is covered by 14 other smaller counters, leaving a gap in the bottom right hand corner (HOME). What is the smallest number of moves. . . .

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A circle rolls around the outside edge of a square so that its circumference always touches the edge of the square. Can you describe the locus of the centre of the circle?

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Two circles of equal radius touch at P. One circle is fixed whilst the other moves, rolling without slipping, all the way round. How many times does the moving coin revolve before returning to P?

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Ask a friend to choose a number between 1 and 63. By identifying which of the six cards contains the number they are thinking of it is easy to tell them what the number is.

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Euler discussed whether or not it was possible to stroll around Koenigsberg crossing each of its seven bridges exactly once. Experiment with different numbers of islands and bridges.

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To avoid losing think of another very well known game where the patterns of play are similar.

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We can show that (x + 1)² = x² + 2x + 1 by considering the area of an (x + 1) by (x + 1) square. Show in a similar way that (x + 2)² = x² + 4x + 4

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It's easy to work out the areas of most squares that we meet, but what if they were tilted?

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Show how this pentagonal tile can be used to tile the plane and describe the transformations which map this pentagon to its images in the tiling.

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When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...

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Triangular numbers can be represented by a triangular array of squares. What do you notice about the sum of identical triangle numbers?

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How good are you at finding the formula for a number pattern ?

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Here is a chance to play a fractions version of the classic Countdown Game.

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Here is a chance to play a version of the classic Countdown Game.

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Can you fill in the mixed up numbers in this dilution calculation?

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Which dilutions can you make using only 10ml pipettes?

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Use your skill and knowledge to place various scientific lengths in order of size. Can you judge the length of objects with sizes ranging from 1 Angstrom to 1 million km with no wrong attempts?

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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.

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Try entering different sets of numbers in the number pyramids. How does the total at the top change?

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Can you find the pairs that represent the same amount of money?

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Can you beat the computer in the challenging strategy game?

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It is possible to identify a particular card out of a pack of 15 with the use of some mathematical reasoning. What is this reasoning and can it be applied to other numbers of cards?

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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?