De or het tellende?

The correct Dutch article is:

de tellende

How to use tellende

the tellendede tellende
this tellendedeze tellende
that tellendedie tellende
our tellendeonze tellende
your tellendejouw tellende
every tellendeelke tellende
which tellende?welke tellende?
a big tellende / the big tellendeeen grote tellende, de grote tellende

Dutch words ending in tellende

belangstellende | kaderstellende

In compound words, the last part decides the article. See the rule