Persian Grammar
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Ordinal numbers indicate position in a series e.g. first, second. They are formed by adding -om to cardinal numbers. The following table, lists Persian's ordinal numbers.

0th
صفرم
sefrom
1st
یکم
yekom
2nd
دوم
dovvom
3rd
سوم
sevvom
4th
چهارم
chahârom
5th
پنجم
panjom
6th
ششم
sheshom
7th
هفتم
haftom
8th
هشتم
hashtom
9th
نهم
nohom
10th
دهم
dahom
11th
یازدهم
yâzdahom
12th
دوازدهم
davâzdahom
13th
سیزدهم
sizdahom
14th
چهاردهم
chahârdahom
15th
پانزدهم
pânzdahom
16th
شانزدهم
shânzdahom
17th
هفدهم
hefdahom
18th
هجدهم
hejdahom
19th
نوزدهم
nuzdahom
20th
بیستم
bistom
21st
بیست و یکم
bist o yekom
22nd
بیست و دوم
bist o dovvom
30th
سی‌ام
siyom
33rd
سی و سوم
si yo sevvom
40th
چهلم
chehelom
44th
چهل و چهارم
chehel o chahârom
50th
پنجاهم
panjâhom
55th
پنجاه و پنجم
panjâh o panjom
60th
شصتم
shastom
66th
شصت و ششم
shast o sheshom
70th
هفتادم
haftâdom
77th
هفتاد و هفتم
haftâd o haftom
80th
هشتادم
hashtâdom
88th
هشتاد و هشتم
hashtâd o hashtom
90th
نودم
navadom
99th
نود و نهم
navad o nohom
100th
صدم
sadom
110th
صد و دهم
sad o dahom
200th
دویستم
devistom
222nd
دویست و بیست و دوم
devist o bist o dovvom
300th
سیصدم
sisadom
400th
چهارصدم
chahârsadom
500th
پانصدم
pânsadom
600th
ششصدم
sheshsadom
700th
هفتصدم
haftsadom
800th
هشتصدم
hashtsadom
900th
نهصدم
nohsadom
1000th
هزارم
hezârom
1001st
هزار و یکم
hezâr o yekom
1100th
هزار و صدم
hezâr o sadom
2000th
دو هزارم
do hezârom
2010th
دو هزار و دهم
do hezâr o dahom
10,000th
ده هزارم
dah hezârom
20,000th
بیست هزارم
bist hezârom
100,000th
صد هزارم
sad hezârom
1,000,000th
یک میلیونم
yek milyunom
2,000,000th
دو میلیونم
do milyunom
1,000,000,000th
یک میلیاردم
yek milyârdom
1,000,000,000,000th
یک تریلیونم
yek terilyunom

For first, there are also اول (avval) and نخست (nokhost, nakhost). Among these three words, اول has a wider usage. However, regarding 21st, 31st, 101st, 1001sth, … only the regular word i.e. یکم is possible e.g. بیست و یکم (bist o yekom: twenty-first). The word نخست is found in some fixed expressions e.g. نخست‌وزیر (nokhost-vazir: prime minister).

As a general phonetic rule, when a word that ends in a vowel and a suffix that begins with a vowel, join together, an auxiliary consonant sound appears between them. This consonant can be y, ø or v depending on the situation. Regarding do (two) and se (three), the consonant is v: do+om = dovvom, se+om = sevvom. The consonant v is doubled to facilitate pronunciation. Regarding si (thirty), the auxiliary consonant is y: si+om = siyom.

Position

Just as a normal adjective, ordinal numbers come after the noun they modify and are related to it with genitive preposition (e/ye):

روز دهم
ruz-e dahom
tenth day
فصل سوم
fasl-e sevvom
third chapter
بار دهم است که این را به تو می‌گویم
Bâr-e dahom ast ke in râ be to miguyam
It's the tenth time I tell you this
در طبقه‌ی چهارم زندگی می‌کند
Dar tabaghe-ye chahârom zendegi mikonad
He/She lives on the fourth floor