How many different cuboids can you make when you use four CDs or DVDs? How about using five, then six?
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?
How can you arrange the 5 cubes so that you need the smallest number of Brush Loads of paint to cover them? Try with other numbers of cubes as well.
This challenge involves eight three-cube models made from interlocking cubes. Investigate different ways of putting the models together then compare your constructions.
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?
Use the three triangles to fill these outline shapes. Perhaps you can create some of your own shapes for a friend to fill?
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?
10 space travellers are waiting to board their spaceships. There are two rows of seats in the waiting room. Using the rules, where are they all sitting? Can you find all the possible ways?
Make a cube out of straws and have a go at this practical challenge.
Try to picture these buildings of cubes in your head. Can you make them to check whether you had imagined them correctly?
A toy has a regular tetrahedron, a cube and a base with triangular and square hollows. If you fit a shape into the correct hollow a bell rings. How many times does the bell ring in a complete game?
What is the smallest cuboid that you can put in this box so that you cannot fit another that's the same into it?
One face of a regular tetrahedron is painted blue and each of the remaining faces are painted using one of the colours red, green or yellow. How many different possibilities are there?
Have a go at this 3D extension to the Pebbles problem.
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?
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 it up?
Paint a stripe on a cardboard roll. Can you predict what will happen when it is rolled across a sheet of paper?
A dog is looking for a good place to bury his bone. Can you work out where he started and ended in each case? What possible routes could he have taken?
Choose a box and work out the smallest rectangle of paper needed to wrap it so that it is completely covered.
This task, written for the National Young Mathematicians' Award 2016, involves open-topped boxes made with interlocking cubes. Explore the number of units of paint that are needed to cover the boxes. . . .
Use the lines on this figure to show how the square can be divided into 2 halves, 3 thirds, 6 sixths and 9 ninths.
Investigate the number of paths you can take from one vertex to another in these 3D shapes. Is it possible to take an odd number and an even number of paths to the same vertex?
A magician took a suit of thirteen cards and held them in his hand face down. Every card he revealed had the same value as the one he had just finished spelling. How did this work?
Here are more buildings to picture in your mind's eye. Watch out - they become quite complicated!
How many different triangles can you make on a circular pegboard that has nine pegs?
What is the greatest number of squares you can make by overlapping three squares?
Eight children each had a cube made from modelling clay. They cut them into four pieces which were all exactly the same shape and size. Whose pieces are the same? Can you decide who made each set?
How can you paint the faces of these eight cubes so they can be put together to make a 2 x 2 x 2 cube that is green all over AND a 2 x 2 x 2 cube that is yellow all over?
Can you cut up a square in the way shown and make the pieces into a triangle?
How will you go about finding all the jigsaw pieces that have one peg and one hole?
Move four sticks so there are exactly four triangles.
Can you find ways of joining cubes together so that 28 faces are visible?
Exploring and predicting folding, cutting and punching holes and making spirals.
This practical problem challenges you to make quadrilaterals with a loop of string. You'll need some friends to help!
Find your way through the grid starting at 2 and following these operations. What number do you end on?
I've made some cubes and some cubes with holes in. This challenge invites you to explore the difference in the number of small cubes I've used. Can you see any patterns?
Design an arrangement of display boards in the school hall which fits the requirements of different people.
How many different ways can you find of fitting five hexagons together? How will you know you have found all the ways?
How many DIFFERENT quadrilaterals can be made by joining the dots on the 8-point circle?
Looking at the picture of this Jomista Mat, can you decribe what you see? Why not try and make one yourself?
What happens when you try and fit the triomino pieces into these two grids?
Can you cover the camel with these pieces?
You have been given three shapes made out of sponge: a sphere, a cylinder and a cone. Your challenge is to find out how to cut them to make different shapes for printing.
What is the best way to shunt these carriages so that each train can continue its journey?
Can you describe a piece of paper clearly enough for your partner to know which piece it is?
We can cut a small triangle off the corner of a square and then fit the two pieces together. Can you work out how these shapes are made from the two pieces?
Have a look at what happens when you pull a reef knot and a granny knot tight. Which do you think is best for securing things together? Why?
A hundred square has been printed on both sides of a piece of paper. What is on the back of 100? 58? 23? 19?
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?
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?