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The opposite vertices of a square have coordinates (a,b) and (c,d). What are the coordinates of the other vertices?

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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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A tilted square is a square with no horizontal sides. Can you devise a general instruction for the construction of a square when you are given just one of its sides?

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A right-angled isosceles triangle is rotated about the centre point of a square. What can you say about the area of the part of the square covered by the triangle as it rotates?

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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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There are 27 small cubes in a 3 x 3 x 3 cube, 54 faces being visible at any one time. Is it possible to reorganise these cubes so that by dipping the large cube into a pot of paint three times you. . . .

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

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Can you use small coloured cubes to make a 3 by 3 by 3 cube so that each face of the bigger cube contains one of each colour?

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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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Do you know how to find the area of a triangle? You can count the squares. What happens if we turn the triangle on end? Press the button and see. Try counting the number of units in the triangle now. . . .

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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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P is a point on the circumference of a circle radius r which rolls, without slipping, inside a circle of radius 2r. What is the locus of P?

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Prove Pythagoras' Theorem using enlargements and scale factors.

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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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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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Find all the ways of placing the numbers 1 to 9 on a W shape, with 3 numbers on each leg, so that each set of 3 numbers has the same total.

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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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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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If you continue the pattern, can you predict what each of the following areas will be? Try to explain your prediction.

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

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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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Use Excel to explore multiplication of fractions.

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

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An Excel spreadsheet with an investigation.

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Use Excel to practise adding and subtracting fractions.

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Use an interactive Excel spreadsheet to investigate factors and multiples.

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

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Use an Excel spreadsheet to explore long multiplication.

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

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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?

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

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

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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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Can you work out what step size to take to ensure you visit all the dots on 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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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?