Originally posted by: Lavinae https://forum.duolingo.com/comment/3750833
Below you can find an overview of the Dutch names of the cardinal numbers.
Pointers & Rules
From 21 upwards, you pronounce the numbers by first saying the units (the single numbers) and then the tens. These units and tens are joined together by en, the conjunction.
Examples: "drieëntwintig" (23) (which features an ë to aid pronunciation); "vijfenzestig" (65); "vierentachtig" (84); "achtennegentig" (98).
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The Dutch actually do not use a decimal point but a decimal comma. Thus, you may come across: 2,4%; 1,5 (one and a half); 6,8 (6.8 in English); etcetera.
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After the number or quantity you've provided, the following selection of words occurs in its singular form: “centimeter” (centimeter), “meter” (meter), “kilometer” (kilometer), “kilo” (kilo), “liter” (liter), “gram” (gram), “jaar” (year), “uur” (hour) and “euro(cent)” (euro(cent)).
Examples:
“Mag ik drie kilo, alsjeblieft?”=“Can I have three kilos, please?”
“Dit insect is vier centimeter lang.”=“This insect is four centimeters long.”
“Hier woon ik al zes jaar.”=“I’ve already been living here for six years.”
Ordinal numbers
First: the numbers up to 19. These particular numbers are formed by simply attaching -de to the cardinal number.
"tweede" (second), "derde" (third), "tiende" (tenth), "achttiende" (eighteenth) etcetera.
Exceptions to this rule are “eerste” (first); “derde” (third) and “achtste” (eighth)
The ordinal numbers of 20 and higher receive -ste as a suffix.
“Het is de dertigste vandaag.”=“It is the thirtieth today.”
“Hij is de achtentwintigste man.”=“He is the twenty-eighth man.”