Cut four triangles from a square as shown in the picture. How many different shapes can you make by fitting the four triangles back together?
Place six toy ladybirds into the box so that there are two ladybirds in every column and every row.
Can you use the numbers on the dice to reach your end of the number line before your partner beats you?
Can you find all the different ways of lining up these Cuisenaire rods?
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?
How many different rhythms can you make by putting two drums on the wheel?
Is it possible to place 2 counters on the 3 by 3 grid so that there is an even number of counters in every row and every column? How about if you have 3 counters or 4 counters or....?
This problem is based on a code using two different prime numbers less than 10. You'll need to multiply them together and shift the alphabet forwards by the result. Can you decipher the code?
Place the numbers 1 to 10 in the circles so that each number is the difference between the two numbers just below it.
Ben and his mum are planting garlic. Use the interactivity to help you find out how many cloves of garlic they might have had.
Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.
How many different triangles can you draw on the dotty grid which each have one dot in the middle?
Hover your mouse over the counters to see which ones will be removed. Click to remover them. The winner is the last one to remove a counter. How you can make sure you win?
Here are some rods that are different colours. How could I make a dark green rod using yellow and white rods?
Can you complete this jigsaw of the 100 square?
Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land.
This was a problem for our birthday website. Can you use four of these pieces to form a square? How about making a square with all five pieces?
How many different ways can you find to join three equilateral triangles together? Can you convince us that you have found them all?
Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
How many trains can you make which are the same length as Matt's, using rods that are identical?
Use the clues to colour each square.
How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?
Can you cover the camel with these pieces?
Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?
There are three versions of this challenge. The idea is to change the colour of all the spots on the grid. Can you do it in fewer throws of the dice?
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
Incey Wincey Spider game for an adult and child. Will Incey get to the top of the drainpipe?
Investigate the different sounds you can make by putting the owls and donkeys on the wheel.
If you hang two weights on one side of this balance, in how many different ways can you hang three weights on the other side for it to be balanced?
There are nine teddies in Teddy Town - three red, three blue and three yellow. There are also nine houses, three of each colour. Can you put them on the map of Teddy Town according to the rules?
How many different triangles can you make on a circular pegboard that has nine pegs?
Can you put the numbers from 1 to 15 on the circles so that no consecutive numbers lie anywhere along a continuous straight line?
What happens when you try and fit the triomino pieces into these two grids?
You have 4 red and 5 blue counters. How many ways can they be placed on a 3 by 3 grid so that all the rows columns and diagonals have an even number of red counters?
Can you work out how to balance this equaliser? You can put more than one weight on a hook.
A tetromino is made up of four squares joined edge to edge. Can this tetromino, together with 15 copies of itself, be used to cover an eight by eight chessboard?
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?
Try out the lottery that is played in a far-away land. What is the chance of winning?
Find out how we can describe the "symmetries" of this triangle and investigate some combinations of rotating and flipping it.
Use the information about Sally and her brother to find out how many children there are in the Brown family.
An interactive activity for one to experiment with a tricky tessellation
In your bank, you have three types of coins. The number of spots shows how much they are worth. Can you choose coins to exchange with the groups given to make the same total?
What are the coordinates of the coloured dots that mark out the tangram? Try changing the position of the origin. What happens to the coordinates now?
Starting with the number 180, take away 9 again and again, joining up the dots as you go. Watch out - don't join all the dots!
Make one big triangle so the numbers that touch on the small triangles add to 10. You could use the interactivity to help you.
Move just three of the circles so that the triangle faces in the opposite direction.
A game for 2 people that everybody knows. You can play with a friend or online. If you play correctly you never lose!
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?