Find out how we can describe the "symmetries" of this triangle and investigate some combinations of rotating and flipping it.
Three beads are threaded on a circular wire and are coloured either red or blue. Can you find all four different combinations?
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 generic circular pegboard resource.
Use the Cuisenaire rods environment to investigate ratio. Can you find pairs of rods in the ratio 3:2? How about 9:6?
Work out the fractions to match the cards with the same amount of money.
Choose the size of your pegboard and the shapes you can make. Can you work out the strategies needed to block your opponent?
Use the interactivity or play this dice game yourself. How could you make it fair?
Investigate how the four L-shapes fit together to make an enlarged L-shape. You could explore this idea with other shapes too.
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?
Watch this film carefully. Can you find a general rule for explaining when the dot will be this same distance from the horizontal axis?
Our 2008 Advent Calendar has a 'Making Maths' activity for every day in the run-up to Christmas.
How can the same pieces of the tangram make this bowl before and after it was chipped? Use the interactivity to try and work out what is going on!
A train building game for 2 players.
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?
Try to stop your opponent from being able to split the piles of counters into unequal numbers. Can you find a strategy?
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.
What shaped overlaps can you make with two circles which are the same size? What shapes are 'left over'? What shapes can you make when the circles are different sizes?
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.
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?
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.
A shape and space game for 2,3 or 4 players. Be the last person to be able to place a pentomino piece on the playing board. Play with card, or on the computer.
An interactive game for 1 person. You are given a rectangle with 50 squares on it. Roll the dice to get a percentage between 2 and 100. How many squares is this? Keep going until you get 100. . . .
Try this interactive strategy game for 2
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?
Choose 13 spots on the grid. Can you work out the scoring system? What is the maximum possible score?
A game for 2 people that everybody knows. You can play with a friend or online. If you play correctly you never lose!
Exchange the positions of the two sets of counters in the least possible number of moves
An interactive activity for one to experiment with a tricky tessellation
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?
A card pairing game involving knowledge of simple ratio.
Can you make the green spot travel through the tube by moving the yellow spot? Could you draw a tube that both spots would follow?
A simulation of target archery practice
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?
Use the blue spot to help you move the yellow spot from one star to the other. How are the trails of the blue and yellow spots related?
Train game for an adult and child. Who will be the first to make the train?
NRICH December 2006 advent calendar - a new tangram for each day in the run-up to Christmas.
How have the numbers been placed in this Carroll diagram? Which labels would you put on each row and column?
Board Block game for two. Can you stop your partner from being able to make a shape on the board?
Use the interactivities to fill in these Carroll diagrams. How do you know where to place the numbers?
Can you fit the tangram pieces into the outlines of these clocks?
Can you see why 2 by 2 could be 5? Can you predict what 2 by 10 will be?
Can you fit the tangram pieces into the outline of Little Ming playing the board game?
How many different triangles can you make on a circular pegboard that has nine pegs?
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!
Can you fit the tangram pieces into the outline of these rabbits?
Can you fit the tangram pieces into the outline of this shape. How would you describe it?
Can you fit the tangram pieces into the outlines of Mai Ling and Chi Wing?
Can you fit the tangram pieces into the outlines of the watering can and man in a boat?