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I'm Eight

Find a great variety of ways of asking questions which make 8.

Let's Investigate Triangles

Vincent and Tara are making triangles with the class construction set. They have a pile of strips of different lengths. How many different triangles can they make?


Noah saw 12 legs walk by into the Ark. How many creatures did he see?

Break it Up!

Age 5 to 11
Challenge Level

You have a stick of 7 interlocking cubes (or a tower of 7 Lego blocks). You cannot change the order of the cubes.


stick of seven differently coloured cubes


You break off a bit of it leaving it in two pieces.

Here are three of the ways in which you can do it:

2 interlocking cubes and 5 interlocking cubes

3 interlocking cubes and 4 interlocking cubes

5 interlocking cubes and 2 interlocking cubes


In how many different ways can it be done?

Now try with a stick of 8 cubes and a stick of 6 cubes:

eight interlocking cubes of different colours six interlocking cubes of different colours


Now predict how many ways there will be with 5 cubes.

Try it! Were you right?

How many ways with 20 cubes? 50 cubes? 100 cubes?

ANY number of cubes?