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Can you continue this pattern of triangles and begin to predict how many sticks are used for each new "layer"?

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While we were sorting some papers we found 3 strange sheets which seemed to come from small books but there were page numbers at the foot of each page. Did the pages come from the same book?

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How can you arrange these 10 matches in four piles so that when you move one match from three of the piles into the fourth, you end up with the same arrangement?

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Can you dissect an equilateral triangle into 6 smaller ones? What number of smaller equilateral triangles is it NOT possible to dissect a larger equilateral triangle into?

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Polygonal numbers are those that are arranged in shapes as they enlarge. Explore the polygonal numbers drawn here.

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

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Compare the numbers of particular tiles in one or all of these three designs, inspired by the floor tiles of a church in Cambridge.

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Surprise your friends with this magic square trick.

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In each of the pictures the invitation is for you to: Count what you see. Identify how you think the pattern would continue.

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Can you make dice stairs using the rules stated? How do you know you have all the possible stairs?

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This challenge, written for the Young Mathematicians' Award, invites you to explore 'centred squares'.

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

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Find the sum and difference between a pair of two-digit numbers. Now find the sum and difference between the sum and difference! What happens?

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Can you find a way of counting the spheres in these arrangements?

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It starts quite simple but great opportunities for number discoveries and patterns!

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Think of a number, square it and subtract your starting number. Is the number youâ€™re left with odd or even? How do the images help to explain this?

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In how many different ways can you break up a stick of 7 interlocking cubes? Now try with a stick of 8 cubes and a stick of 6 cubes.

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How many ways can you find to do up all four buttons on my coat? How about if I had five buttons? Six ...?

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This challenge focuses on finding the sum and difference of pairs of two-digit numbers.

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Tom and Ben visited Numberland. Use the maps to work out the number of points each of their routes scores.

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What happens when you round these three-digit numbers to the nearest 100?

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Try adding together the dates of all the days in one week. Now multiply the first date by 7 and add 21. Can you explain what happens?

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Use the interactivity to investigate what kinds of triangles can be drawn on peg boards with different numbers of pegs.

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Here are some arrangements of circles. How many circles would I need to make the next size up for each? Can you create your own arrangement and investigate the number of circles it needs?

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An investigation that gives you the opportunity to make and justify predictions.

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Only one side of a two-slice toaster is working. What is the quickest way to toast both sides of three slices of bread?

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Sweets are given out to party-goers in a particular way. Investigate the total number of sweets received by people sitting in different positions.

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What can you say about these shapes? This problem challenges you to create shapes with different areas and perimeters.

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We can arrange dots in a similar way to the 5 on a dice and they usually sit quite well into a rectangular shape. How many altogether in this 3 by 5? What happens for other sizes?

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This challenge encourages you to explore dividing a three-digit number by a single-digit number.

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This task follows on from Build it Up and takes the ideas into three dimensions!

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How many different journeys could you make if you were going to visit four stations in this network? How about if there were five stations? Can you predict the number of journeys for seven stations?

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What happens if you join every second point on this circle? How about every third point? Try with different steps and see if you can predict what will happen.

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In a Magic Square all the rows, columns and diagonals add to the 'Magic Constant'. How would you change the magic constant of this square?

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Watch this animation. What do you notice? What happens when you try more or fewer cubes in a bundle?

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Watch this animation. What do you see? Can you explain why this happens?

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Can you find all the ways to get 15 at the top of this triangle of numbers? Many opportunities to work in different ways.

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Imagine starting with one yellow cube and covering it all over with a single layer of red cubes, and then covering that cube with a layer of blue cubes. How many red and blue cubes would you need?

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Benâ€™s class were cutting up number tracks. First they cut them into twos and added up the numbers on each piece. What patterns could they see?

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How many moves does it take to swap over some red and blue frogs? Do you have a method?

An article for teachers and pupils that encourages you to look at the mathematical properties of similar games.

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Find a route from the outside to the inside of this square, stepping on as many tiles as possible.

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What happens when you round these numbers to the nearest whole number?

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Place the numbers from 1 to 9 in the squares below so that the difference between joined squares is odd. How many different ways can you do this?

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In this problem we are looking at sets of parallel sticks that cross each other. What is the least number of crossings you can make? And the greatest?

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Charlie has made a Magic V. Can you use his example to make some more? And how about Magic Ls, Ns and Ws?

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Here are two kinds of spirals for you to explore. What do you notice?

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Can you put the numbers 1-5 in the V shape so that both 'arms' have the same total?

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Square numbers can be represented as the sum of consecutive odd numbers. What is the sum of 1 + 3 + ..... + 149 + 151 + 153?

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How many centimetres of rope will I need to make another mat just like the one I have here?