You may also like


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?

Four Triangles Puzzle

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?

Cut it Out

Can you dissect an equilateral triangle into 6 smaller ones? What number of smaller equilateral triangles is it NOT possible to dissect a larger equilateral triangle into?

The Deca Tree

Age 7 to 11
Challenge Level

The Deca Tree printable sheet


In the forest there is a Deca Tree.
A Deca Tree has 10 trunks,


tree with 10 trunks

and on each trunk there are 10 branches,

trunk with 10 branches

and on each branch there are 10 twigs,

branch with 10 twigs

and on each twig there are 10 leaves:

twig with 10 leaves

One day a woodcutter came along and cut down one trunk from the tree.
Then he cut off one branch from another trunk of the tree.
Then he cut off one twig from another branch.
Finally he pulled one leaf from another twig.

How many leaves were left on the tree then?
How did you work out the solution?


Click here for a poster of this problem.