{{Table_Numeral_Systems}}
'''Thai Numerals''' (ตัวเลขไทย) are traditionally used in Thailand, although the Hindu-Arabic_numerals (also known as Western numerals) are more common. Apart from the different symbols used for the numerals, the Thai numeration system is exactly the same as the Hindu-Arabic_numeral_system used in most of the rest of the world.
==Cardinal numbers==
===Zero to nine===
{| class="wikitable"
|-
!colspan="2"|'''Thai'''!!'''RTGS'''!!'''value'''
|-
|๐||ศูนย์ ||''sun''||zero
|-
|๑||หนึ่ง||''nueng''||one
|-
|๒||สอง||''song''||two
|-
|๓||สาม ||''sam''||three
|-
|๔||สี่||''si''||four
|-
|๕||ห้า||''ha''||five
|-
|๖||หก||''hok''||six
|-
|๗||เจ็ด||''chet''||seven
|-
|๘||แปด||''paet''||eight
|-
|๙||เก้า||''kao''||nine
|}
===Ten to a million===
These are assembled from the words for the powers of ten. The number one following a power of ten becomes ''et''. The numbers from twenty to twenty nine begin with ''yi sip''.
{| class="wikitable"
|-
!colspan="2"|'''Thai'''!!'''RTGS'''!!'''value'''
|-
|๑๐||สิบ||''sip''||ten
|-
|๑๑||สิบเอ็ด||''sip et''||eleven
|-
|๑๒||สิบสอง||''sip song''||twelve
|-
|๒๐||ยี่สิบ||''yi sip''||twenty
|-
|๒๑||ยี่สิบเอ็ด||''yi sip et''||twenty-one
|-
|๒๒||ยี่สิบสอง||''yi sip song''||twenty-two
|-
|๑๐๐||ร้อย||''roi''||hundred
|-
|๑๐๐๐||พัน||''phan''||thousand
|-
|๑๐๐๐๐||หมื่น||''muen''||ten thousand
|-
|๑๐๐๐๐๐||แสน||''saen''||hundred thousand
|-
|๑๐๐๐๐๐๐||ล้าน||''lan''||million
|}
For example, two hundred and thirty-two is ''song roi sam sip song''. The words ''roi'', ''phan'' etc. should never be used without a preceding numeral (unless it is beginning ''nueng''), so two hundred and ten, for example, is ''song roi sip'' and not ''song roi nueng sip'', and one hundred is either ''roi'' or ''nueng roi'' (both are acceptable). The same thing goes for ''phan'', ''muen'', ''saen'', and so forth. Native speakers will sometimes use ''roi nueng'' (or ''phan nueng'', etc.) with different tones on ''nueng'' to distinguish one hundred from one hundred and one. However, such distinction is often not made, and ambiguity may follow. To resolve this problem, if the number 101 (or 1001, 10001, etc.) is intended, one should say ''roi et'' (or ''phan et'', ''muen et'', etc.).
===Numbers above a million===
Numbers above a million are constructed by prefixing ''lan'' with a multiplier. For example, ten million is ''sip lan'', and a trillion (1012) is ''lan lan''.
===Decimal and fractional numbers===
Colloquially, decimal numbers are formed by saying จุด (''chut'', dot) where the Decimal_separator is located. For example, 1.01 is หนึ่งจุดศูนย์หนึ่ง.
Fractional numbers are formed by placing ใน (''nai'', in, of) between the numerator and denomintor. For example, ⅓ is หนึ่งในสาม.
===Negative numbers===
Negative numbers are formed by placing ลบ (''lop'', minus) in front of the number. For example, -11 is ลบสิบเอ็ด.
==Ordinal numbers==
Ordinal_numbers are formed by placing ที่ (''thi'', place) in front of the number.
{| class="wikitable"
|-
!'''Thai'''!!'''RTGS'''!!'''meaning'''
|-
|ที่หนึ่ง||''thi nueng''||first
|-
|ที่สอง||''thi song''||second
|-
|ที่สาม ||''thi sam''||third
|-
|ที่สี่||''thi si''||fourth
|-
|ที่#||''thi #''||#st, #nd, #rd, #th
|}
==Alternate numbers==
An alternate set of numerals is used to name tonal marks (ไม้, ''mai'') and educational degrees (ปริญญา, ''prinya'').
{|class="wikitable"
!colspan="3"|Number
!colspan="4"|Tonal Mark
!colspan="3"|Educational Degree
|-
!align="left"|Thai||RTGS||Value||Mark||Thai||RTGS||Meaning||Thai||RTGS||Meaning
|-
||เอก||''ek''||one
||–่||ไม้เอก||''mai ek''||first tone mark
||ปริญญาเอก||''prinya ek''||doctor's degree
|-
||โท||''tho''||two
||–้||ไม้โท||''mai tho''||second tone mark
||ปริญญาโท||''prinya tho''||master's degree
|-
||ตรี||''tri''||three
||–๊||ไม้ตรี||''mai tri''||third tone mark
||ปริญญาตรี||''prinya tri''||bachelor's degree
|-
||จัตวา ||''chattawa''||four
||–๋||ไม้จัตวา ||''mai chattawa''||fourth tone mark
!colspan="3"|
|}
==See also==
* Thai_language
* Thai_alphabet
* Thai_six-hour_clock
Category:Thai_culture
Category:Numeration
Fr:Numération_thaï
Nl:Thaise_cijfers
Th:เลขไทย
Zh:泰文数字