This project challenges you to work out the number of cubes hidden
under a cloth. What questions would you like to ask?
A game in which players take it in turns to choose a number. Can you block your opponent?
Can you predict when you'll be clapping and when you'll be clicking
if you start this rhythm? How about when a friend begins a new
rhythm at the same time?
In how many ways can you fit two of these yellow triangles
together? Can you predict the number of ways two blue triangles can
be fitted together?
Take 5 cubes of one colour and 2 of another colour. How many
different ways can you join them if the 5 must touch the table and
the 2 must not touch the table?
The Man is much smaller than us. Can you use the picture of him
next to a mug to estimate his height and how much tea he drinks?
Can you each work out the number on your card? What do you notice?
How could you sort the cards?
Take a rectangle of paper and fold it in half, and half again, to
make four smaller rectangles. How many different ways can you fold
You have a set of the digits from 0 – 9. Can you arrange
these in the 5 boxes to make two-digit numbers as close to the
targets as possible?
Using different numbers of sticks, how many different triangles are
you able to make? Can you make any rules about the numbers of
sticks that make the most triangles?
If you split the square into these two pieces, it is possible to fit the pieces together again to make a new shape. How many new shapes can you make?
Arrange 9 red cubes, 9 blue cubes and 9 yellow cubes into a large 3 by 3 cube. No row or column of cubes must contain two cubes of the same colour.
Make your own double-sided magic square. But can you complete both
sides once you've made the pieces?
Ahmed is making rods using different numbers of cubes. Which rod is
twice the length of his first rod?
Investigate the smallest number of moves it takes to turn these
mats upside-down if you can only turn exactly three at a time.
An activity making various patterns with 2 x 1 rectangular tiles.
Use the three triangles to fill these outline shapes. Perhaps you can create some of your own shapes for a friend to fill?
How many models can you find which obey these rules?
If you have ten counters numbered 1 to 10, how many can you put
into pairs that add to 10? Which ones do you have to leave out?
What is the greatest number of counters you can place on the grid
below without four of them lying at the corners of a square?
Are all the possible combinations of two shapes included in this
set of 27 cards? How do you know?
In this article for teachers, Bernard uses some problems to suggest
that once a numerical pattern has been spotted from a practical
starting point, going back to the practical can help explain. . . .
Try continuing these patterns made from triangles. Can you create
your own repeating pattern?
How many triangles can you make on the 3 by 3 pegboard?
Make an equilateral triangle by folding paper and use it to make
patterns of your own.
These pictures show squares split into halves. Can you find other
Make a spiral mobile.
Can you make the most extraordinary, the most amazing, the most
unusual patterns/designs from these triangles which are made in a
The ancient Egyptians were said to make right-angled triangles
using a rope with twelve equal sections divided by knots. What
other triangles could you make if you had a rope like this?
How can you put five cereal packets together to make different
shapes if you must put them face-to-face?
Here is a version of the game 'Happy Families' for you to make and
It might seem impossible but it is possible. How can you cut a
playing card to make a hole big enough to walk through?
You could use just coloured pencils and paper to create this
design, but it will be more eye-catching if you can get hold of
hammer, nails and string.
A game to make and play based on the number line.
Kate has eight multilink cubes. She has two red ones, two yellow, two green and two blue.
She wants to fit them together to make a cube so that each colour shows on each face just once.
NRICH December 2006 advent calendar - a new tangram for each day in
the run-up to Christmas.
In this town, houses are built with one room for each person. There
are some families of seven people living in the town. In how many
different ways can they build their houses?
In this challenge, you will work in a group to investigate circular
fences enclosing trees that are planted in square or triangular
Our 2008 Advent Calendar has a 'Making Maths' activity for every
day in the run-up to Christmas.
We went to the cinema and decided to buy some bags of popcorn so we
asked about the prices. Investigate how much popcorn each bag holds
so find out which we might have bought.
A brief video looking at how you can sometimes use symmetry to
distinguish knots. Can you use this idea to investigate the
differences between the granny knot and the reef knot?
Let's say you can only use two different lengths - 2 units and 4
units. Using just these 2 lengths as the edges how many different
cuboids can you make?
Explore the triangles that can be made with seven sticks of the
Can you create more models that follow these rules?
Watch the video to see how to fold a square of paper to create a
flower. What fraction of the piece of paper is the small triangle?
What is the largest number of circles we can fit into the frame
without them overlapping? How do you know? What will happen if you
try the other shapes?
What happens to the area of a square if you double the length of
the sides? Try the same thing with rectangles, diamonds and other
shapes. How do the four smaller ones fit into the larger one?
This practical investigation invites you to make tessellating
shapes in a similar way to the artist Escher.
Can you order pictures of the development of a frog from frogspawn
and of a bean seed growing into a plant?
Is there a best way to stack cans? What do different supermarkets
do? How high can you safely stack the cans?