Nets

article
Thinking 3D

How can we as teachers begin to introduce 3D ideas to young children? Where do they start? How can we lay the foundations for a later enthusiasm for working in three dimensions?
article
All is number

Read all about Pythagoras' mathematical discoveries in this article written for students.
problem
Net result

Age

11 to 14

Challenge level

The net shown here is cut out and folded to form a cube. Which face is then opposite the face marked X?
problem
Air nets

Age

7 to 18

Challenge level

Can you visualise whether these nets fold up into 3D shapes? Watch the videos each time to see if you were correct.
problem
Chopped dice

Age

14 to 16

Challenge level

Can you make a new type of fair die with 14 faces by shaving the corners off a cube?
problem
Rhombicubocts

Age

11 to 14

Challenge level

Each of these solids is made up with 3 squares and a triangle around each vertex. Each has a total of 18 square faces and 8 faces that are equilateral triangles. How many faces, edges and vertices does each solid have?
problem
Cutting a cube

Age

11 to 14

Challenge level

A half-cube is cut into two pieces by a plane through the long diagonal and at right angles to it. Can you draw a net of these pieces? Are they identical?
problem
Cubic conundrum

Age

7 to 16

Challenge level

Which of the following cubes can be made from these nets?
problem
Magic octahedron

Age

11 to 14

Challenge level

Weekly Problem 20 - 2010
You have already used Magic Squares, now meet a Magic Octahedron...
problem
More Christmas boxes

Age

7 to 11

Challenge level

What size square should you cut out of each corner of a 10 x 10 grid to make the box that would hold the greatest number of cubes?