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

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

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

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

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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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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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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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Surprise your friends with this magic square trick.

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What's the largest volume of box you can make from a square of paper?

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

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

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

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Can you dissect a square into: 4, 7, 10, 13... other squares? 6, 9, 12, 15... other squares? 8, 11, 14... other squares?

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Imagine we have four bags containing a large number of 1s, 4s, 7s and 10s. What numbers can we make?

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Rectangles are considered different if they vary in size or have different locations. How many different rectangles can be drawn on a chessboard?

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Choose a couple of the sequences. Try to picture how to make the next, and the next, and the next... Can you describe your reasoning?

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

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

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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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How could Penny, Tom and Matthew work out how many chocolates there are in different sized boxes?

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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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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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The Tower of Hanoi is an ancient mathematical challenge. Working on the building blocks may help you to explain the patterns you notice.

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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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Explore the area of families of parallelograms and triangles. Can you find rules to work out the areas?

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

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

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

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

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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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Are these statements always true, sometimes true or never true?

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A 2 by 3 rectangle contains 8 squares and a 3 by 4 rectangle contains 20 squares. What size rectangle(s) contain(s) exactly 100 squares? Can you find them all?

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

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

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

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Delight your friends with this cunning trick! Can you explain how it works?