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Norrie sees two lights flash at the same time, then one of them flashes every 4th second, and the other flashes every 5th second. How many times do they flash together during a whole minute?

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One block is needed to make an up-and-down staircase, with one step up and one step down. How many blocks would be needed to build an up-and-down staircase with 5 steps up and 5 steps down?

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Can you put these four calculations into order of difficulty? How did you decide?

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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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These sixteen children are standing in four lines of four, one behind the other. They are each holding a card with a number on it. Can you work out the missing numbers?

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Watch the video of this game being played. Can you work out the rules? Which dice totals are good to get, and why?

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Do you agree with Badger's statements? Is Badger's reasoning 'watertight'? Why or why not?

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Can you use the clues to complete these 4 by 4 Mathematical Sudokus?

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What happens when you add the digits of a number then multiply the result by 2 and you keep doing this? You could try for different numbers and different rules.

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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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Can you predict when you'll be clapping and when you'll be clicking if you start this rhythm? How about when a friend begins a new rhythm at the same 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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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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Can you complete this jigsaw of the multiplication square?

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This big box multiplies anything that goes inside it by the same number. If you know the numbers that come out, what multiplication might be going on in the box?

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This problem is designed to help children to learn, and to use, the two and three times tables.

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Look at different ways of dividing things. What do they mean? How might you show them in a picture, with things, with numbers and symbols?

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How many different shaped boxes can you design for 36 sweets in one layer? Can you arrange the sweets so that no sweets of the same colour are next to each other in any direction?

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These eleven shapes each stand for a different number. Can you use the number sentences to work out what they are?

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

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Put operations signs between the numbers 3 4 5 6 to make the highest possible number and lowest possible number.

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Which is quicker, counting up to 30 in ones or counting up to 300 in tens? Why?

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Four of these clues are needed to find the chosen number on this grid and four are true but do nothing to help in finding the number. Can you sort out the clues and find the number?

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

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On the planet Vuv there are two sorts of creatures. The Zios have 3 legs and the Zepts have 7 legs. The great planetary explorer Nico counted 52 legs. How many Zios and how many Zepts were there?

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

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Investigate the sum of the numbers on the top and bottom faces of a line of three dice. What do you notice?

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

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48 is called an abundant number because it is less than the sum of its factors (without itself). Can you find some more abundant numbers?

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Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?

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In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?

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

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

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This group activity will encourage you to share calculation strategies and to think about which strategy might be the most efficient.

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Can you match these calculation methods to their visual representations?

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Nearly all of us have made table patterns on hundred squares, that is 10 by 10 grids. This problem looks at the patterns on differently sized square grids.

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Which pairs of cogs let the coloured tooth touch every tooth on the other cog? Which pairs do not let this happen? Why?

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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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Each light in this interactivity turns on according to a rule. What happens when you enter different numbers? Can you find the smallest number that lights up all four lights?

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What do the numbers shaded in blue on this hundred square have in common? What do you notice about the pink numbers? How about the shaded numbers in the other squares?

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Mrs Morgan, the class's teacher, pinned numbers onto the backs of three children. Use the information to find out what the three numbers were.

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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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Factor track is not a race but a game of skill. The idea is to go round the track in as few moves as possible, keeping to the rules.

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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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Can you make square numbers by adding two prime numbers together?

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Can you see how these factor-multiple chains work? Find the chain which contains the smallest possible numbers. How about the largest possible numbers?

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Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?

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Can you make a cycle of pairs that add to make a square number using all the numbers in the box below, once and once only?

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This challenge is a game for two players. Choose two of the numbers to multiply or divide, then mark your answer on the number line. Can you get four in a row?

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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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I'm thinking of a number. My number is both a multiple of 5 and a multiple of 6. What could my number be?

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Imagine a pyramid which is built in square layers of small cubes. If we number the cubes from the top, starting with 1, can you picture which cubes are directly below this first cube?

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Find at least one way to put in some operation signs (+ - x Ã·) to make these digits come to 100.

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Use 4 four times with simple operations so that you get the answer 12. Can you make 15, 16 and 17 too?

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Can you order the digits from 1-3 to make a number which is divisible by 3 so when the last digit is removed it becomes a 2-figure number divisible by 2, and so on?

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How will you decide which way of flipping over and/or turning the grid will give you the highest total?

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We start with one yellow cube and build around it to make a 3x3x3 cube with red cubes. Then we build around that red cube with blue cubes and so on. How many cubes of each colour have we used?