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

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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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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 Excel spreadsheet to explore long multiplication.

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

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

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

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

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Use an interactive Excel spreadsheet to investigate factors and multiples.

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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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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?

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A and B are two interlocking cogwheels having p teeth and q teeth respectively. One tooth on B is painted red. Find the values of p and q for which the red tooth on B contacts every gap on the. . . .

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in how many ways can you place the numbers 1, 2, 3 … 9 in the nine regions of the Olympic Emblem (5 overlapping circles) so that the amount in each ring is the same?

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

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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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Can you find a relationship between the number of dots on the circle and the number of steps that will ensure that all points are hit?

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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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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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Two engines, at opposite ends of a single track railway line, set off towards one another just as a fly, sitting on the front of one of the engines, sets off flying along the railway line...

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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.

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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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Can you beat the computer in the challenging strategy game?

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

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

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

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Given the nets of 4 cubes with the faces coloured in 4 colours, build a tower so that on each vertical wall no colour is repeated, that is all 4 colours appear.

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

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Some treasure has been hidden in a three-dimensional grid! Can you work out a strategy to find it as efficiently as possible?

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Draw some isosceles triangles with an area of $9$cm$^2$ and a vertex at (20,20). If all the vertices must have whole number coordinates, how many is it possible to draw?

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

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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?

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A collection of resources to support work on Factors and Multiples at Secondary level.

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

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Triangle ABC has equilateral triangles drawn on its edges. Points P, Q and R are the centres of the equilateral triangles. What can you prove about the triangle PQR?

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

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

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Semi-regular tessellations combine two or more different regular polygons to fill the plane. Can you find all the semi-regular tessellations?