What shapes should Elly cut out to make a witch's hat? How can she make a taller hat?
A description of some experiments in which you can make discoveries about triangles.
Explore one of these five pictures.
A follow-up activity to Tiles in the Garden.
How will you decide which way of flipping over and/or turning the grid will give you the highest total?
Numbers arranged in a square but some exceptional spatial awareness probably needed.
How many different sets of numbers with at least four members can you find in the numbers in this box?
There are three tables in a room with blocks of chocolate on each. Where would be the best place for each child in the class to sit if they came in one at a time?
This article for teachers suggests ideas for activities built around 10 and 2010.
How many different ways can you find of fitting five hexagons
together? How will you know you have found all the ways?
This article (the first of two) contains ideas for investigations.
Space-time, the curvature of space and topology are introduced with
some fascinating problems to explore.
The letters of the word ABACUS have been arranged in the shape of a
triangle. How many different ways can you find to read the word
ABACUS from this triangular pattern?
All types of mathematical problems serve a useful purpose in
mathematics teaching, but different types of problem will achieve
different learning objectives. In generalmore open-ended problems
have. . . .
In this article for teachers, Bernard gives an example of taking an
initial activity and getting questions going that lead to other
In this investigation, we look at Pascal's Triangle in a slightly different way - rotated and with the top line of ones taken off.
We think this 3x3 version of the game is often harder than the 5x5 version. Do you agree? If so, why do you think that might be?
Place four pebbles on the sand in the form of a square. Keep adding as few pebbles as necessary to double the area. How many extra pebbles are added each time?
Work with numbers big and small to estimate and calculate various quantities in biological contexts.
Investigate how this pattern of squares continues. You could
measure lengths, areas and angles.
This tricky challenge asks you to find ways of going across rectangles, going through exactly ten squares.
Which times on a digital clock have a line of symmetry? Which look
the same upside-down? You might like to try this investigation and
Formulate and investigate a simple mathematical model for the design of a table mat.
Take ten sticks in heaps any way you like. Make a new heap using one from each of the heaps. By repeating that process could the arrangement 7 - 1 - 1 - 1 ever turn up, except by starting with it?
A challenging activity focusing on finding all possible ways of stacking rods.
It starts quite simple but great opportunities for number discoveries and patterns!
In how many ways can you stack these rods, following the rules?
How many shapes can you build from three red and two green cubes? Can you use what you've found out to predict the number for four red and two green?
If the answer's 2010, what could the question be?
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?
An investigation that gives you the opportunity to make and justify
This activity asks you to collect information about the birds you
see in the garden. Are there patterns in the data or do the birds
seem to visit randomly?
48 is called an abundant number because it is less than the sum of its factors (without itself). Can you find some more abundant numbers?
Can you find ways of joining cubes together so that 28 faces are
I cut this square into two different shapes. What can you say about
the relationship between them?
What is the largest cuboid you can wrap in an A3 sheet of paper?
Can you continue this pattern of triangles and begin to predict how many sticks are used for each new "layer"?
An activity making various patterns with 2 x 1 rectangular tiles.
Investigate what happens when you add house numbers along a street
in different ways.
In this investigation, you must try to make houses using cubes. If
the base must not spill over 4 squares and you have 7 cubes which
stand for 7 rooms, what different designs can you come up with?
Can you find out how the 6-triangle shape is transformed in these
tessellations? Will the tessellations go on for ever? Why or why
What is the smallest cuboid that you can put in this box so that
you cannot fit another that's the same into it?
What is the smallest number of tiles needed to tile this patio? Can
you investigate patios of different sizes?
What do these two triangles have in common? How are they related?
Use the interactivity to investigate what kinds of triangles can be
drawn on peg boards with different numbers of pegs.
In this investigation, you are challenged to make mobile phone
numbers which are easy to remember. What happens if you make a
sequence adding 2 each time?
Explore the different tunes you can make with these five gourds.
What are the similarities and differences between the two tunes you
When Charlie asked his grandmother how old she is, he didn't get a
straightforward reply! Can you work out how old she is?
This challenging activity involves finding different ways to distribute fifteen items among four sets, when the sets must include three, four, five and six items.
Take a look at these data collected by children in 1986 as part of the Domesday Project. What do they tell you? What do you think about the way they are presented?
This challenge extends the Plants investigation so now four or more children are involved.