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This challenge extends the Plants investigation so now four or more children are involved.

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Three children are going to buy some plants for their birthdays. They will plant them within circular paths. How could they do this?

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This challenging activity involves finding different ways to distribute fifteen items among four sets, when the sets must include three, four, five and six items.

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Have a go at balancing this equation. Can you find different ways of doing it?

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Can you arrange 5 different digits (from 0 - 9) in the cross in the way described?

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Cherri, Saxon, Mel and Paul are friends. They are all different ages. Can you find out the age of each friend using the information?

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An investigation involving adding and subtracting sets of consecutive numbers. Lots to find out, lots to explore.

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Using the statements, can you work out how many of each type of rabbit there are in these pens?

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Can you work out some different ways to balance this equation?

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There are 44 people coming to a dinner party. There are 15 square tables that seat 4 people. Find a way to seat the 44 people using all 15 tables, with no empty places.

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How could you put these three beads into bags? How many different ways can you do it? How could you record what you've done?

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Can you complete this calculation by filling in the missing numbers? In how many different ways can you do it?

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This magic square has operations written in it, to make it into a maze. Start wherever you like, go through every cell and go out a total of 15!

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What could the half time scores have been in these Olympic hockey matches?

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Add the sum of the squares of four numbers between 10 and 20 to the sum of the squares of three numbers less than 6 to make the square of another, larger, number.

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Can you fill in this table square? The numbers 2 -12 were used to generate it with just one number used twice.

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On my calculator I divided one whole number by another whole number and got the answer 3.125. If the numbers are both under 50, what are they?

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Can you work out the arrangement of the digits in the square so that the given products are correct? The numbers 1 - 9 may be used once and once only.

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

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Zumf makes spectacles for the residents of the planet Zargon, who have either 3 eyes or 4 eyes. How many lenses will Zumf need to make all the different orders for 9 families?

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How long does it take to brush your teeth? Can you find the matching length of time?

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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 substitute numbers for the letters in these sums?

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This task, written for the National Young Mathematicians' Award 2016, invites you to explore the different combinations of scores that you might get on these dart boards.

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George and Jim want to buy a chocolate bar. George needs 2p more and Jim need 50p more to buy it. How much is the chocolate bar?

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In the multiplication calculation, some of the digits have been replaced by letters and others by asterisks. Can you reconstruct the original multiplication?

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The planet of Vuvv has seven moons. Can you work out how long it is between each super-eclipse?

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Use your logical-thinking skills to deduce how much Dan's crisps and ice-cream cost altogether.

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Can you replace the letters with numbers? Is there only one solution in each case?

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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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Use the numbers and symbols to make this number sentence correct. How many different ways can you find?

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Can you put plus signs in so this is true? 1 2 3 4 5 6 7 8 9 = 99 How many ways can you do it?

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This dice train has been made using specific rules. How many different trains can you make?

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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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This multiplication uses each of the digits 0 - 9 once and once only. Using the information given, can you replace the stars in the calculation with figures?

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There is a clock-face where the numbers have become all mixed up. Can you find out where all the numbers have got to from these ten statements?

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The letters of the word ABACUS have been arranged in the shape of a triangle. How many different ways can you find to read the word ABACUS from this triangular pattern?

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A group of children are using measuring cylinders but they lose the labels. Can you help relabel them?

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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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There are 4 jugs which hold 9 litres, 7 litres, 4 litres and 2 litres. Find a way to pour 9 litres of drink from one jug to another until you are left with exactly 3 litres in three of the jugs.

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Place the numbers 1 to 8 in the circles so that no consecutive numbers are joined by a line.

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What do you notice about the date 03.06.09? Or 08.01.09? This challenge invites you to investigate some interesting dates yourself.

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If you had any number of ordinary dice, what are the possible ways of making their totals 6? What would the product of the dice be each time?

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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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Find out about the lottery that is played in a far-away land. What is the chance of winning?

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There are 78 prisoners in a square cell block of twelve cells. The clever prison warder arranged them so there were 25 along each wall of the prison block. How did he do it?

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This problem is based on the story of the Pied Piper of Hamelin. Investigate the different numbers of people and rats there could have been if you know how many legs there are altogether!

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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 Sudoku, based on differences. Using the one clue number can you find the solution?