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The Deca Tree

Age 7 to 11
Challenge Level

 

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.