Can you work out how to balance this equaliser? You can put more
than one weight on a hook.
What happens when you try and fit the triomino pieces into these
NRICH December 2006 advent calendar - a new tangram for each day in
the run-up to Christmas.
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 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?
Our 2008 Advent Calendar has a 'Making Maths' activity for every
day in the run-up to Christmas.
Investigate the smallest number of moves it takes to turn these
mats upside-down if you can only turn exactly three at a time.
Can you cover the camel with these pieces?
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?
Ben and his mum are planting garlic. Use the interactivity to help
you find out how many cloves of garlic they might have had.
Use the clues to colour each square.
How many different rhythms can you make by putting two drums on the
An interactive activity for one to experiment with a tricky tessellation
A variant on the game Alquerque
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!
A game for 2 people that everybody knows. You can play with a
friend or online. If you play correctly you never lose!
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?
A generic circular pegboard resource.
An odd version of tic tac toe
A card pairing game involving knowledge of simple ratio.
How many different ways can you find to join three equilateral triangles together? Can you convince us that you have found them all?
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 out how many quarter turns the man must rotate through to look like each of the pictures.
How many different triangles can you make on a circular pegboard that has nine pegs?
Find out how we can describe the "symmetries" of this triangle and
investigate some combinations of rotating and flipping it.
Take it in turns to place a domino on the grid. One to be placed horizontally and the other vertically. Can you make it impossible for your opponent to play?
Move just three of the circles so that the triangle faces in the
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?
Place the numbers 1 to 6 in the circles so that each number is the
difference between the two numbers just below it.
Twenty four games for the run-up to Christmas.
A train building game for 2 players.
Can you find all the different ways of lining up these Cuisenaire
Place the numbers 1 to 10 in the circles so that each number is the
difference between the two numbers just below it.
Choose 13 spots on the grid. Can you work out the scoring system? What is the maximum possible score?
Incey Wincey Spider game for an adult and child. Will Incey get to the top of the drainpipe?
Train game for an adult and child. Who will be the first to make the train?
Using angular.js to bind inputs to outputs
Complete the squares - but be warned some are trickier than they
Use the interactivity to help get a feel for this problem and to find out all the possible ways the balls could land.
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....?
How many triangles can you make using sticks that are 3cm, 4cm and 5cm long?
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
An interactive game to be played on your own or with friends.
Imagine you are having a party. Each person takes it in turns to
stand behind the chair where they will get the most chocolate.
Work out the fractions to match the cards with the same amount of
Match the halves.
Explore the different tunes you can make with these five gourds.
What are the similarities and differences between the two tunes you
Here are some rods that are different colours. How could I make a dark green rod using yellow and white rods?
Ahmed has some wooden planks to use for three sides of a rabbit run
against the shed. What quadrilaterals would he be able to make with
the planks of different lengths?
A game for 2 people that can be played on line or with pens and paper. Combine your knowledege of coordinates with your skills of strategic thinking.