das Zehntel
tenth
One of ten equal parts of a whole; the tenth part or the fraction 1/10.
Ein Zehntel der Befragten gab an, mit dem Service unzufrieden zu sein.
One tenth of the respondents said they were dissatisfied with the service.

tenth
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tenth
One of ten equal parts of a whole; the tenth part or the fraction 1/10.
Ein Zehntel der Befragten gab an, mit dem Service unzufrieden zu sein.
One tenth of the respondents said they were dissatisfied with the service.

The word is derived from the ordinal number 'zehnte' (tenth). The ending '-el' is used in German to form fractional numbers as nouns (e.g. Drittel, Viertel, Achtel).
Für das Rezept benötigst du nur ein Zehntel Liter Milch.
For the recipe, you only need one tenth of a liter of milk.
Although 'Zehntel' describes a number, it is a noun and is therefore always capitalized. This is a common mistake among learners.
Er hat nur ein Zehntel der Aufgaben richtig gelöst.
He solved only one tenth of the tasks correctly.
When 'Zehntel' describes a part of a group, it is usually followed by a noun in the genitive. The construction with 'von' + dative is more colloquial.
Ein Zehntel der Weltbevölkerung hat keinen Zugang zu sauberem Wasser.
One tenth of the world's population has no access to clean water.
In a sports context, 'Zehntel' almost always means 'Zehntelsekunde' (tenth of a second). The word 'Sekunde' (second) is often omitted because it is clear from the context.
Die Läuferin war nur zwei Zehntel langsamer als die Siegerin.
The runner was only two tenths slower than the winner.
tenth
'zehnt' and 'das Zehntel' look similar, but they do not mean the same thing. 'zehnt' is an ordinal number and shows a place in a sequence: the tenth day, the tenth grade. In 'zu zehnt', it also describes a group of ten people. 'das Zehntel' is a part of a whole, namely one of ten equal parts. Learners may confuse the words because both are connected to the number ten. Remember: 'zehnt' asks about order or about ten people, while 'Zehntel' asks about a share.

Ein Zehntel des Kuchens bleibt für Anna übrig.
One tenth of the cake is left for Anna.
Am zehnten Tag der Reise sind wir endlich am Meer angekommen.
On the tenth day of the trip, we finally arrived at the sea.