Place six toy ladybirds into the box so that there are two ladybirds in every column and every row.
Can you put the numbers 1 to 8 into the circles so that the four calculations are correct?
What happens when you try and fit the triomino pieces into these two grids?
Can you see why 2 by 2 could be 5? Can you predict what 2 by 10 will be?
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?
First Connect Three game for an adult and child. Use the dice numbers and either addition or subtraction to get three numbers in a straight line.
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?
Hover your mouse over the counters to see which ones will be removed. Click to remove them. The winner is the last one to remove a counter. How you can make sure you win?
Place the numbers 1 to 6 in the circles so that each number is the difference between the two numbers just below it.
Place the numbers 1 to 10 in the circles so that each number is the difference between the two numbers just below it.
Can you cover the camel with these pieces?
Use the clues to colour each square.
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?
How many different ways can you find to join three equilateral triangles together? Can you convince us that you have found them all?
Can you work out how to balance this equaliser? You can put more than one weight on a hook.
Ben and his mum are planting garlic. Use the interactivity to help you find out how many cloves of garlic they might have had.
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?
Here are some rods that are different colours. How could I make a yellow rod using white and red rods?
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....?
Use your mouse to move the red and green parts of this disc. Can you make images which show the turnings described?
Use the interactivity to find all the different right-angled triangles you can make by just moving one corner of the starting triangle.
Imagine a wheel with different markings painted on it at regular intervals. Can you predict the colour of the 18th mark? The 100th mark?
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
How many different triangles can you make on a circular pegboard that has nine pegs?
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?
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 triangles can you make using sticks that are 3cm, 4cm and 5cm long?
Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land.
Investigate the smallest number of moves it takes to turn these mats upside-down if you can only turn exactly three at a time.
How many different triangles can you draw on the dotty grid which each have one dot in the middle?
Can you put the numbers from 1 to 15 on the circles so that no consecutive numbers lie anywhere along a continuous straight line?
In this activity, the computer chooses a times table and shifts it. Can you work out the table and the shift each time?
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?
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?
Sort the houses in my street into different groups. Can you do it in any other ways?
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?
Choose a symbol to put into the number sentence.
This 100 square jigsaw is written in code. It starts with 1 and ends with 100. Can you build it up?
How many trains can you make which are the same length as Matt's and Katie's, using rods that are identical?
If you have only four weights, where could you place them in order to balance this equaliser?
Players take it in turns to choose a dot on the grid. The winner is the first to have four dots that can be joined to form a square.
Board Block game for two. Can you stop your partner from being able to make a shape on the board?
Arrange the four number cards on the grid, according to the rules, to make a diagonal, vertical or horizontal line.
Seeing Squares game for an adult and child. Can you come up with a way of always winning this game?
A game for 2 people that everybody knows. You can play with a friend or online. If you play correctly you never lose!
An interactive activity for one to experiment with a tricky tessellation
A game for 1 person. Can you work out how the dice must be rolled from the start position to the finish? Play on line.
A game to be played against the computer, or in groups. Pick a 7-digit number. A random digit is generated. What must you subract to remove the digit from your number? the first to zero wins.
Work out the fractions to match the cards with the same amount of money.
A game for 1 or 2 people. Use the interactive version, or play with friends. Try to round up as many counters as possible.