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'The Deca Tree' printed from http://nrich.maths.org/

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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?

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