How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?
How many different triangles can you draw on the dotty grid which each have one dot in the middle?
How many different triangles can you make on a circular pegboard
that has nine pegs?
Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land.
Use the clues to colour each square.
How many trains can you make which are the same length as Matt's,
using rods that are identical?
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?
Can you work out how to balance this equaliser? You can put more
than one weight on a hook.
Can you put the 25 coloured tiles into the 5 x 5 square so that no
column, no row and no diagonal line have tiles of the same colour
Place the numbers 1 to 6 in the circles so that each number is the
difference between the two numbers just below it.
Here are some rods that are different colours. How could I make a dark green rod using yellow and white rods?
Can you find all the different triangles on these peg boards, and
find their angles?
Ben and his mum are planting garlic. Use the interactivity to help
you find out how many cloves of garlic they might have had.
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?
How many different rhythms can you make by putting two drums on the
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?
Investigate the smallest number of moves it takes to turn these
mats upside-down if you can only turn exactly three at a time.
Place six toy ladybirds into the box so that there are two
ladybirds in every column and every row.
Cut four triangles from a square as shown in the picture. How many
different shapes can you make by fitting the four triangles back
Can you cover the camel with these pieces?
How many different ways can you find to join three equilateral
triangles together? Can you convince us that you have found them
What happens when you try and fit the triomino pieces into these
What does the overlap of these two shapes look like? Try picturing
it in your head and then use the interactivity to test your
This 100 square jigsaw is written in code. It starts with 1 and
ends with 100. Can you build it up?
Try out the lottery that is played in a far-away land. What is the
chance of winning?
Arrange the four number cards on the grid, according to the rules,
to make a diagonal, vertical or horizontal line.
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?
Can you hang weights in the right place to make the equaliser
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?
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
Have a go at this well-known challenge. Can you swap the frogs and toads in as few slides and jumps as possible?
Can you sort these triangles into three different families and explain how you did it?
Use the interactivity to find all the different right-angled
triangles you can make by just moving one corner of the starting
Use the information about Sally and her brother to find out how many children there are in the Brown family.
Investigate the different sounds you can make by putting the owls
and donkeys on the wheel.
Choose four of the numbers from 1 to 9 to put in the squares so that the differences between joined squares are odd.
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 put the numbers from 1 to 15 on the circles so that no
consecutive numbers lie anywhere along a continuous straight line?
Can you find all the different ways of lining up these Cuisenaire
Find out what a "fault-free" rectangle is and try to make some of
Can you put the numbers 1 to 8 into the circles so that the four
calculations are correct?
Our 2008 Advent Calendar has a 'Making Maths' activity for every
day in the run-up to Christmas.
Make one big triangle so the numbers that touch on the small triangles add to 10. You could use the interactivity to help you.
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?
Take it in turns to make a triangle on the pegboard. Can you block
Terry and Ali are playing a game with three balls. Is it fair that
Terry wins when the middle ball is red?
Find out how we can describe the "symmetries" of this triangle and
investigate some combinations of rotating and flipping it.
Sort the houses in my street into different groups. Can you do it in any other ways?
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?
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?