Is it der, die oder das Denken?
The correct article in German of Denken is das. So it is das Denken! (nominative case)
The word Denken is neuter, therefore the correct article is das.
Finding the right gender of a noun
German articles are used similarly to the English articles,a and the. However, they are declined differently (change) according to the number, gender and case of their nouns.
In the German language, the gender and therefore article is fixed for each noun.
The most difficult part of learning the German language is the articles (der, die, das) or rather the gender of each noun. The gender of each noun in German has no simple rule. In fact, it can even seem illogical. For example das Mädchen, a young girl is neutral while der Junge, a young boy is male.
It is a good idea to learn the correct article for each new word together - even if it means a lot of work. For example learning "der Hund" (the dog) rather than just Hund by itself. Fortunately, there are some rules about gender in German that make things a little easier. It might be even nicer if these rules didn't have exceptions - but you can't have everything! The best way to learn them is with the App - Der-Die-Das Train! (available for iOS and Android)
German nouns belong either to the gender masculine (male, standard gender) with the definite article der, to the feminine (feminine) with the definite article die, or to the neuter (neuter) with the definite article das.
for masculine: points of the compass, weather (Osten, Monsun, Sturm; however it is: das Gewitter), liquor/spirits (Wodka, Wein, Kognak), minerals, rocks (Marmor, Quarz, Granit, Diamant);
for feminine: ships and airplanes (die Deutschland, die Boeing; however it is: der Airbus), cigarette brands (Camel, Marlboro), many tree and plant species (Eiche, Pappel, Kiefer; aber: der Flieder), numbers (Eins, Million; however it is: das Dutzend), most inland rivers (Elbe, Oder, Donau; aber: der Rhein);
for neutrals: cafes, hotels, cinemas (das Mariott, das Cinemaxx), chemical elements (Helium, Arsen; however it is: der Schwefel, masculine elements have the suffix -stoff), letters, notes, languages and colors (das Orange, das A, das Englische), certain brand names for detergents and cleaning products (Ariel, Persil), continents, countries (die artikellosen: (das alte) Europa; however exceptions include: der Libanon, die Schweiz …).
German declension of Denken?
How does the declension of Denken work in the nominative, accusative, dative and genitive cases? Here you can find all forms in the singular as well as in the plural:
What is the meaning of Denken in German?
Denken has various definitions in German:
 Setting to something Einstellung zu etwas
 Targeted mental activity zielgerichtete geistige Tätigkeit
How to use Denken in a sentence?
Example sentences in German using Denken with translations in English.
 Rechtes Denken ist für viele längst gesellschaftsfähig. Law thinking is for many long-term partnership
 „Gegen Ende des 19. Jahrhunderts verbreitete sich das eugenische Denken in den fortgeschrittenen Industrienationen rasch, vor allem unter Ärzten, auch Psychiatern.“ "Towards the end of the 19th century, eugenic thinking rapidly spread in the advanced industrialized nations, especially among doctors, also psychiatrists." 
 Hör mit dem Denken auf, wir müssen handeln! Listen to thinking, we have to act
 Das Denken der Gedanken ist gedankenloses Denken. The thinking of thought is thoughtless thinking
How do you pronounce Denken?
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