Expressing fractions - general (numbers)

Beware not to mix up fractions (to describe a part of a whole: half, third, fourth...) and ordinal numbers (to describe an order/rank: 1st, 2nd, 3rd, 4th, ...).
For ordinal numbers, see Forming ordinal numbers (1st, 2nd, 10th...).


Look at these examples of fractions:

un cinquième1/5 - one fifth

deux cinquièmes2/5 - two fifths

seize vingtièmes16/20 - sixteen twentieths

To express fractions in French, you usually use both cardinal (un/deux/trois...) and ordinal numbers (premier/cinquième...) the same way as in English (one fifth).

Note also that just like in English, the second number is plural if the first is.


ATTENTION: 
Here are the irregular fractional numbers:

un demi1/2 

 un tiers 1/3

deux tiers 2/3

trois quarts3/4

un quart1/4

 

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Examples and resources

un cinquième1/5 - one fifth
seize vingtièmes16/20 - sixteen twentieths
deux cinquièmes2/5 - two fifths

special forms


deux tiers 2/3
 un tiers 1/3
un demi1/2 
un quart1/4
trois quarts3/4
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