How To: Ordinal Number 55 000 000 000 555 555 555 666 655 444 411 255 778 555 555 555 555 555 555 563 333 665 555 555 555 555 666 666 666 666 666 666 665 555 555 555 550 000 000 005 500 000 000 054 999 999 993 549 999 999 950 000 000 005 500 000 000 054 999 999 985 Written Out in Words Form, Indicates Position or Order in a List. Numeral 55 000 000 000 555 555 555 666 655 444 411 255 778 555 555 555 555 555 555 563 333 665 555 555 555 555 666 666 666 666 666 666 665 555 555 555 550 000 000 005 500 000 000 054 999 999 993 549 999 999 950 000 000 005 500 000 000 054 999 999 985 Converted to Words in US American English in Eight Different Letter Cases, Title Case, Sentence Case and Start Case Included

Ordinal number 55 000 000 000 555 555 555 666 655 444 411 255 778 555 555 555 555 555 555 563 333 665 555 555 555 555 666 666 666 666 666 666 665 555 555 555 550 000 000 005 500 000 000 054 999 999 993 549 999 999 950 000 000 005 500 000 000 054 999 999 985th converted and written out in words, in (US) American English

fifty-five novemquinquagintillion five hundred fifty-five quinquinquagintillion five hundred fifty-five quattuorquinquagintillion five hundred fifty-five trequinquagintillion six hundred sixty-six duoquinquagintillion six hundred fifty-five unquinquagintillion four hundred forty-four quinquagintillion four hundred eleven novemquadragintillion two hundred fifty-five octoquadragintillion seven hundred seventy-eight septenquadragintillion five hundred fifty-five sexquadragintillion five hundred fifty-five quinquadragintillion five hundred fifty-five quattuorquadragintillion five hundred fifty-five trequadragintillion five hundred fifty-five duoquadragintillion five hundred fifty-five unquadragintillion five hundred sixty-three quadragintillion three hundred thirty-three novemtrigintillion six hundred sixty-five octotrigintillion five hundred fifty-five septentrigintillion five hundred fifty-five sextrigintillion five hundred fifty-five quintrigintillion five hundred fifty-five quattuortrigintillion six hundred sixty-six tretrigintillion six hundred sixty-six duotrigintillion six hundred sixty-six untrigintillion six hundred sixty-six trigintillion six hundred sixty-six novemvigintillion six hundred sixty-six octovigintillion six hundred sixty-five septenvigintillion five hundred fifty-five sexvigintillion five hundred fifty-five quinvigintillion five hundred fifty-five quattuorvigintillion five hundred fifty trevigintillion five vigintillion five hundred novemdecillion fifty-four sexdecillion nine hundred ninety-nine quindecillion nine hundred ninety-nine quattuordecillion nine hundred ninety-three tredecillion five hundred forty-nine duodecillion nine hundred ninety-nine undecillion nine hundred ninety-nine decillion nine hundred fifty nonillion five sextillion five hundred quintillion fifty-four billion nine hundred ninety-nine million nine hundred ninety-nine thousand nine hundred eighty-fifth

Letter case 2 of 8
55 000 000 000 555 555 555 666 655 444 411 255 778 555 555 555 555 555 555 563 333 665 555 555 555 555 666 666 666 666 666 666 665 555 555 555 550 000 000 005 500 000 000 054 999 999 993 549 999 999 950 000 000 005 500 000 000 054 999 999 985th SPELLED OUT IN:
UPPERCASE
ALL UPPERCASE LETTERS:

FIFTY-FIVE NOVEMQUINQUAGINTILLION FIVE HUNDRED FIFTY-FIVE QUINQUINQUAGINTILLION FIVE HUNDRED FIFTY-FIVE QUATTUORQUINQUAGINTILLION FIVE HUNDRED FIFTY-FIVE TREQUINQUAGINTILLION SIX HUNDRED SIXTY-SIX DUOQUINQUAGINTILLION SIX HUNDRED FIFTY-FIVE UNQUINQUAGINTILLION FOUR HUNDRED FORTY-FOUR QUINQUAGINTILLION FOUR HUNDRED ELEVEN NOVEMQUADRAGINTILLION TWO HUNDRED FIFTY-FIVE OCTOQUADRAGINTILLION SEVEN HUNDRED SEVENTY-EIGHT SEPTENQUADRAGINTILLION FIVE HUNDRED FIFTY-FIVE SEXQUADRAGINTILLION FIVE HUNDRED FIFTY-FIVE QUINQUADRAGINTILLION FIVE HUNDRED FIFTY-FIVE QUATTUORQUADRAGINTILLION FIVE HUNDRED FIFTY-FIVE TREQUADRAGINTILLION FIVE HUNDRED FIFTY-FIVE DUOQUADRAGINTILLION FIVE HUNDRED FIFTY-FIVE UNQUADRAGINTILLION FIVE HUNDRED SIXTY-THREE QUADRAGINTILLION THREE HUNDRED THIRTY-THREE NOVEMTRIGINTILLION SIX HUNDRED SIXTY-FIVE OCTOTRIGINTILLION FIVE HUNDRED FIFTY-FIVE SEPTENTRIGINTILLION FIVE HUNDRED FIFTY-FIVE SEXTRIGINTILLION FIVE HUNDRED FIFTY-FIVE QUINTRIGINTILLION FIVE HUNDRED FIFTY-FIVE QUATTUORTRIGINTILLION SIX HUNDRED SIXTY-SIX TRETRIGINTILLION SIX HUNDRED SIXTY-SIX DUOTRIGINTILLION SIX HUNDRED SIXTY-SIX UNTRIGINTILLION SIX HUNDRED SIXTY-SIX TRIGINTILLION SIX HUNDRED SIXTY-SIX NOVEMVIGINTILLION SIX HUNDRED SIXTY-SIX OCTOVIGINTILLION SIX HUNDRED SIXTY-FIVE SEPTENVIGINTILLION FIVE HUNDRED FIFTY-FIVE SEXVIGINTILLION FIVE HUNDRED FIFTY-FIVE QUINVIGINTILLION FIVE HUNDRED FIFTY-FIVE QUATTUORVIGINTILLION FIVE HUNDRED FIFTY TREVIGINTILLION FIVE VIGINTILLION FIVE HUNDRED NOVEMDECILLION FIFTY-FOUR SEXDECILLION NINE HUNDRED NINETY-NINE QUINDECILLION NINE HUNDRED NINETY-NINE QUATTUORDECILLION NINE HUNDRED NINETY-THREE TREDECILLION FIVE HUNDRED FORTY-NINE DUODECILLION NINE HUNDRED NINETY-NINE UNDECILLION NINE HUNDRED NINETY-NINE DECILLION NINE HUNDRED FIFTY NONILLION FIVE SEXTILLION FIVE HUNDRED QUINTILLION FIFTY-FOUR BILLION NINE HUNDRED NINETY-NINE MILLION NINE HUNDRED NINETY-NINE THOUSAND NINE HUNDRED EIGHTY-FIFTH

Fifty-Five Novemquinquagintillion Five Hundred Fifty-Five Quinquinquagintillion Five Hundred Fifty-Five Quattuorquinquagintillion Five Hundred Fifty-Five Trequinquagintillion Six Hundred Sixty-Six Duoquinquagintillion Six Hundred Fifty-Five Unquinquagintillion Four Hundred Forty-Four Quinquagintillion Four Hundred Eleven Novemquadragintillion Two Hundred Fifty-Five Octoquadragintillion Seven Hundred Seventy-Eight Septenquadragintillion Five Hundred Fifty-Five Sexquadragintillion Five Hundred Fifty-Five Quinquadragintillion Five Hundred Fifty-Five Quattuorquadragintillion Five Hundred Fifty-Five Trequadragintillion Five Hundred Fifty-Five Duoquadragintillion Five Hundred Fifty-Five Unquadragintillion Five Hundred Sixty-Three Quadragintillion Three Hundred Thirty-Three Novemtrigintillion Six Hundred Sixty-Five Octotrigintillion Five Hundred Fifty-Five Septentrigintillion Five Hundred Fifty-Five Sextrigintillion Five Hundred Fifty-Five Quintrigintillion Five Hundred Fifty-Five Quattuortrigintillion Six Hundred Sixty-Six Tretrigintillion Six Hundred Sixty-Six Duotrigintillion Six Hundred Sixty-Six Untrigintillion Six Hundred Sixty-Six Trigintillion Six Hundred Sixty-Six Novemvigintillion Six Hundred Sixty-Six Octovigintillion Six Hundred Sixty-Five Septenvigintillion Five Hundred Fifty-Five Sexvigintillion Five Hundred Fifty-Five Quinvigintillion Five Hundred Fifty-Five Quattuorvigintillion Five Hundred Fifty Trevigintillion Five Vigintillion Five Hundred Novemdecillion Fifty-Four Sexdecillion Nine Hundred Ninety-Nine Quindecillion Nine Hundred Ninety-Nine Quattuordecillion Nine Hundred Ninety-Three Tredecillion Five Hundred Forty-Nine Duodecillion Nine Hundred Ninety-Nine Undecillion Nine Hundred Ninety-Nine Decillion Nine Hundred Fifty Nonillion Five Sextillion Five Hundred Quintillion Fifty-Four Billion Nine Hundred Ninety-Nine Million Nine Hundred Ninety-Nine Thousand Nine Hundred Eighty-Fifth

Letter case 4 of 8
55 000 000 000 555 555 555 666 655 444 411 255 778 555 555 555 555 555 555 563 333 665 555 555 555 555 666 666 666 666 666 666 665 555 555 555 550 000 000 005 500 000 000 054 999 999 993 549 999 999 950 000 000 005 500 000 000 054 999 999 985th written out in words in:
Sentence case
Capital letter to start the sentence:

Fifty-five novemquinquagintillion five hundred fifty-five quinquinquagintillion five hundred fifty-five quattuorquinquagintillion five hundred fifty-five trequinquagintillion six hundred sixty-six duoquinquagintillion six hundred fifty-five unquinquagintillion four hundred forty-four quinquagintillion four hundred eleven novemquadragintillion two hundred fifty-five octoquadragintillion seven hundred seventy-eight septenquadragintillion five hundred fifty-five sexquadragintillion five hundred fifty-five quinquadragintillion five hundred fifty-five quattuorquadragintillion five hundred fifty-five trequadragintillion five hundred fifty-five duoquadragintillion five hundred fifty-five unquadragintillion five hundred sixty-three quadragintillion three hundred thirty-three novemtrigintillion six hundred sixty-five octotrigintillion five hundred fifty-five septentrigintillion five hundred fifty-five sextrigintillion five hundred fifty-five quintrigintillion five hundred fifty-five quattuortrigintillion six hundred sixty-six tretrigintillion six hundred sixty-six duotrigintillion six hundred sixty-six untrigintillion six hundred sixty-six trigintillion six hundred sixty-six novemvigintillion six hundred sixty-six octovigintillion six hundred sixty-five septenvigintillion five hundred fifty-five sexvigintillion five hundred fifty-five quinvigintillion five hundred fifty-five quattuorvigintillion five hundred fifty trevigintillion five vigintillion five hundred novemdecillion fifty-four sexdecillion nine hundred ninety-nine quindecillion nine hundred ninety-nine quattuordecillion nine hundred ninety-three tredecillion five hundred forty-nine duodecillion nine hundred ninety-nine undecillion nine hundred ninety-nine decillion nine hundred fifty nonillion five sextillion five hundred quintillion fifty-four billion nine hundred ninety-nine million nine hundred ninety-nine thousand nine hundred eighty-fifth


Fifty-Five Novemquinquagintillion Five Hundred Fifty-Five Quinquinquagintillion Five Hundred Fifty-Five Quattuorquinquagintillion Five Hundred Fifty-Five Trequinquagintillion Six Hundred Sixty-Six Duoquinquagintillion Six Hundred Fifty-Five Unquinquagintillion Four Hundred Forty-Four Quinquagintillion Four Hundred Eleven Novemquadragintillion Two Hundred Fifty-Five Octoquadragintillion Seven Hundred Seventy-Eight Septenquadragintillion Five Hundred Fifty-Five Sexquadragintillion Five Hundred Fifty-Five Quinquadragintillion Five Hundred Fifty-Five Quattuorquadragintillion Five Hundred Fifty-Five Trequadragintillion Five Hundred Fifty-Five Duoquadragintillion Five Hundred Fifty-Five Unquadragintillion Five Hundred Sixty-Three Quadragintillion Three Hundred Thirty-Three Novemtrigintillion Six Hundred Sixty-Five Octotrigintillion Five Hundred Fifty-Five Septentrigintillion Five Hundred Fifty-Five Sextrigintillion Five Hundred Fifty-Five Quintrigintillion Five Hundred Fifty-Five Quattuortrigintillion Six Hundred Sixty-Six Tretrigintillion Six Hundred Sixty-Six Duotrigintillion Six Hundred Sixty-Six Untrigintillion Six Hundred Sixty-Six Trigintillion Six Hundred Sixty-Six Novemvigintillion Six Hundred Sixty-Six Octovigintillion Six Hundred Sixty-Five Septenvigintillion Five Hundred Fifty-Five Sexvigintillion Five Hundred Fifty-Five Quinvigintillion Five Hundred Fifty-Five Quattuorvigintillion Five Hundred Fifty Trevigintillion Five Vigintillion Five Hundred Novemdecillion Fifty-Four Sexdecillion Nine Hundred Ninety-Nine Quindecillion Nine Hundred Ninety-Nine Quattuordecillion Nine Hundred Ninety-Three Tredecillion Five Hundred Forty-Nine Duodecillion Nine Hundred Ninety-Nine Undecillion Nine Hundred Ninety-Nine Decillion Nine Hundred Fifty Nonillion Five Sextillion Five Hundred Quintillion Fifty-Four Billion Nine Hundred Ninety-Nine Million Nine Hundred Ninety-Nine Thousand Nine Hundred Eighty-Fifth

Letter case 6 of 8
55 000 000 000 555 555 555 666 655 444 411 255 778 555 555 555 555 555 555 563 333 665 555 555 555 555 666 666 666 666 666 666 665 555 555 555 550 000 000 005 500 000 000 054 999 999 993 549 999 999 950 000 000 005 500 000 000 054 999 999 985th Converted to words in:
camelCase
first letter in lower case,
subsequent words' first letters in uppercase
spaces and punctuation removed:

fiftyFiveNovemquinquagintillionFiveHundredFiftyFiveQuinquinquagintillionFiveHundredFiftyFiveQuattuorquinquagintillionFiveHundredFiftyFiveTrequinquagintillionSixHundredSixtySixDuoquinquagintillionSixHundredFiftyFiveUnquinquagintillionFourHundredFortyFourQuinquagintillionFourHundredElevenNovemquadragintillionTwoHundredFiftyFiveOctoquadragintillionSevenHundredSeventyEightSeptenquadragintillionFiveHundredFiftyFiveSexquadragintillionFiveHundredFiftyFiveQuinquadragintillionFiveHundredFiftyFiveQuattuorquadragintillionFiveHundredFiftyFiveTrequadragintillionFiveHundredFiftyFiveDuoquadragintillionFiveHundredFiftyFiveUnquadragintillionFiveHundredSixtyThreeQuadragintillionThreeHundredThirtyThreeNovemtrigintillionSixHundredSixtyFiveOctotrigintillionFiveHundredFiftyFiveSeptentrigintillionFiveHundredFiftyFiveSextrigintillionFiveHundredFiftyFiveQuintrigintillionFiveHundredFiftyFiveQuattuortrigintillionSixHundredSixtySixTretrigintillionSixHundredSixtySixDuotrigintillionSixHundredSixtySixUntrigintillionSixHundredSixtySixTrigintillionSixHundredSixtySixNovemvigintillionSixHundredSixtySixOctovigintillionSixHundredSixtyFiveSeptenvigintillionFiveHundredFiftyFiveSexvigintillionFiveHundredFiftyFiveQuinvigintillionFiveHundredFiftyFiveQuattuorvigintillionFiveHundredFiftyTrevigintillionFiveVigintillionFiveHundredNovemdecillionFiftyFourSexdecillionNineHundredNinetyNineQuindecillionNineHundredNinetyNineQuattuordecillionNineHundredNinetyThreeTredecillionFiveHundredFortyNineDuodecillionNineHundredNinetyNineUndecillionNineHundredNinetyNineDecillionNineHundredFiftyNonillionFiveSextillionFiveHundredQuintillionFiftyFourBillionNineHundredNinetyNineMillionNineHundredNinetyNineThousandNineHundredEightyFifth


Letter case 7 of 8
55 000 000 000 555 555 555 666 655 444 411 255 778 555 555 555 555 555 555 563 333 665 555 555 555 555 666 666 666 666 666 666 665 555 555 555 550 000 000 005 500 000 000 054 999 999 993 549 999 999 950 000 000 005 500 000 000 054 999 999 985th written out in words in:
hyphen-case
punctuation - removed
spaces - replaced - by - hyphens:

fifty-five-novemquinquagintillion-five-hundred-fifty-five-quinquinquagintillion-five-hundred-fifty-five-quattuorquinquagintillion-five-hundred-fifty-five-trequinquagintillion-six-hundred-sixty-six-duoquinquagintillion-six-hundred-fifty-five-unquinquagintillion-four-hundred-forty-four-quinquagintillion-four-hundred-eleven-novemquadragintillion-two-hundred-fifty-five-octoquadragintillion-seven-hundred-seventy-eight-septenquadragintillion-five-hundred-fifty-five-sexquadragintillion-five-hundred-fifty-five-quinquadragintillion-five-hundred-fifty-five-quattuorquadragintillion-five-hundred-fifty-five-trequadragintillion-five-hundred-fifty-five-duoquadragintillion-five-hundred-fifty-five-unquadragintillion-five-hundred-sixty-three-quadragintillion-three-hundred-thirty-three-novemtrigintillion-six-hundred-sixty-five-octotrigintillion-five-hundred-fifty-five-septentrigintillion-five-hundred-fifty-five-sextrigintillion-five-hundred-fifty-five-quintrigintillion-five-hundred-fifty-five-quattuortrigintillion-six-hundred-sixty-six-tretrigintillion-six-hundred-sixty-six-duotrigintillion-six-hundred-sixty-six-untrigintillion-six-hundred-sixty-six-trigintillion-six-hundred-sixty-six-novemvigintillion-six-hundred-sixty-six-octovigintillion-six-hundred-sixty-five-septenvigintillion-five-hundred-fifty-five-sexvigintillion-five-hundred-fifty-five-quinvigintillion-five-hundred-fifty-five-quattuorvigintillion-five-hundred-fifty-trevigintillion-five-vigintillion-five-hundred-novemdecillion-fifty-four-sexdecillion-nine-hundred-ninety-nine-quindecillion-nine-hundred-ninety-nine-quattuordecillion-nine-hundred-ninety-three-tredecillion-five-hundred-forty-nine-duodecillion-nine-hundred-ninety-nine-undecillion-nine-hundred-ninety-nine-decillion-nine-hundred-fifty-nonillion-five-sextillion-five-hundred-quintillion-fifty-four-billion-nine-hundred-ninety-nine-million-nine-hundred-ninety-nine-thousand-nine-hundred-eighty-fifth

Letter case 8 of 8
55 000 000 000 555 555 555 666 655 444 411 255 778 555 555 555 555 555 555 563 333 665 555 555 555 555 666 666 666 666 666 666 665 555 555 555 550 000 000 005 500 000 000 054 999 999 993 549 999 999 950 000 000 005 500 000 000 054 999 999 985th SPELLED OUT IN:
snake_case
punctuation _ removed
spaces _ replaced _ by _ underscores:

fifty_five_novemquinquagintillion_five_hundred_fifty_five_quinquinquagintillion_five_hundred_fifty_five_quattuorquinquagintillion_five_hundred_fifty_five_trequinquagintillion_six_hundred_sixty_six_duoquinquagintillion_six_hundred_fifty_five_unquinquagintillion_four_hundred_forty_four_quinquagintillion_four_hundred_eleven_novemquadragintillion_two_hundred_fifty_five_octoquadragintillion_seven_hundred_seventy_eight_septenquadragintillion_five_hundred_fifty_five_sexquadragintillion_five_hundred_fifty_five_quinquadragintillion_five_hundred_fifty_five_quattuorquadragintillion_five_hundred_fifty_five_trequadragintillion_five_hundred_fifty_five_duoquadragintillion_five_hundred_fifty_five_unquadragintillion_five_hundred_sixty_three_quadragintillion_three_hundred_thirty_three_novemtrigintillion_six_hundred_sixty_five_octotrigintillion_five_hundred_fifty_five_septentrigintillion_five_hundred_fifty_five_sextrigintillion_five_hundred_fifty_five_quintrigintillion_five_hundred_fifty_five_quattuortrigintillion_six_hundred_sixty_six_tretrigintillion_six_hundred_sixty_six_duotrigintillion_six_hundred_sixty_six_untrigintillion_six_hundred_sixty_six_trigintillion_six_hundred_sixty_six_novemvigintillion_six_hundred_sixty_six_octovigintillion_six_hundred_sixty_five_septenvigintillion_five_hundred_fifty_five_sexvigintillion_five_hundred_fifty_five_quinvigintillion_five_hundred_fifty_five_quattuorvigintillion_five_hundred_fifty_trevigintillion_five_vigintillion_five_hundred_novemdecillion_fifty_four_sexdecillion_nine_hundred_ninety_nine_quindecillion_nine_hundred_ninety_nine_quattuordecillion_nine_hundred_ninety_three_tredecillion_five_hundred_forty_nine_duodecillion_nine_hundred_ninety_nine_undecillion_nine_hundred_ninety_nine_decillion_nine_hundred_fifty_nonillion_five_sextillion_five_hundred_quintillion_fifty_four_billion_nine_hundred_ninety_nine_million_nine_hundred_ninety_nine_thousand_nine_hundred_eighty_fifth



Notes on the Letter Cases used to write out in words the number above:

  • 1: Lowercase: only lowercase letters are used. Example: 'seventy-six and two tenths'.
  • 2: Uppercase: only uppercase letters are used. Example: 'SEVENTY-SIX AND TWO TENTHS'.
  • 3. Title Case: the first letters of the words are capitalized, except for certain short words, such as articles, conjunctions and short prepositions, 'a', 'an', 'the', 'and', 'but', 'for', 'at', 'by', 'to', 'or', 'in', etc. Example: 'Seventy-Six and Two Tenths'.
  • 4. Sentence case: only the first letter of the first word at the beginning of the sentence is capitalized. Example: 'Seventy-six and two tenths'.
  • 5. Start Case: the first letter of each word is capitalized without any exception. Example: 'Seventy-Six And Two Tenths'.
  • 6. Camel Case: text has no spaces nor punctuation and the first letter of each word is capitalized except for the very first letter in the series. Example: 'seventySixAndTwoTenths'.
  • 7. Hyphen Case: text has no spaces nor punctuation and the words are delimited by hyphen. Example: 'seventy-six-and-two-tenths'. Hyphen Case can be lowercase or uppercase.
  • 8. Snake Case: text has no spaces nor punctuation and the words are delimited by underscore. Example: 'seventy_six_and_two_tenths'. Snake Case can be lowercase or uppercase.

General Notes on Writing Out Numbers:

  • 1: It's correct to hyphenate all compound numbers from twenty-one (21) through ninety-nine (99). The hyphen is the minus sign, as in 'thirty-four' (34).
  • 2: In American English, unlike British English, when writing out natural numbers of three or more digits, the word 'and' is not used after 'hundred' or 'thousand': so it is 'one thousand two hundred thirty-four' and not 'one thousand two hundred and thirty-four'.
  • 3. Use commas when writing in digits numbers above 999: 1,234; 43,290, 1,000,000 etc.


How to convert ordinal numerals to words in (US) American English, how to write them out using letters instead of numerals

How to write out ordinal numbers (those denoting order) in words?

Most ordinal numbers end in "th", so just add "th" to the end of the cardinal number (those denoting quantity, ex: 1 one, 2 two, 3 three, 4 four, ... etc.):

  • cardinal: 4 = four → ordinal: 4th = fourth
  • cardinal: 7 = seven → ordinal: 7th = seventh
  • cardinal: 10 = ten → ordinal: 10th = tenth
  • cardinal: 19 = nineteen → ordinal: 19th = nineteenth
  • cardinal: 100 = one hundred → ordinal: 100th = (one) hundredth
  • cardinal: 1,000 = one thousand → ordinal: 1,000th = (one) thousandth

Exceptions:

  • cardinal: 1 = one → ordinal: first = 1st
  • cardinal: 2 = two → ordinal: second = 2nd
  • cardinal: 3 = three → ordinal: third = 3rd
  • cardinal: 5 = five → ordinal: fifth = 5th
  • cardinal: 8 = eight → ordinal: eighth = 8th
  • cardinal: 9 = nine → ordinal: ninth = 9th
  • cardinal: 12 = twelve → ordinal: twelfth = 12th
  • cardinal: 20 = twenty → ordinal: twentieth = 20th
  • cardinal: 30 = thirty → ordinal: thirtieth = 30th
  • cardinal: 40 = forty → ordinal: fortieth = 40th
  • cardinal: 50 = fifty → ordinal: fiftieth = 50th
  • cardinal: 60 = sixty → ordinal: sixtieth = 60th
  • cardinal: 70 = seventy → ordinal: seventieth = 70th
  • cardinal: 80 = eighty → ordinal: eightieth = 80th
  • cardinal: 90 = ninety → ordinal: ninetieth = 90th

Here there are a couple of the main ordinal numbers, from 1st up to 19th, you can find a longer list in the full article:

  • cardinal: 1 = one; → ordinal: 1st = first;
  • cardinal: 2 = two; → ordinal: 2nd, second;
  • cardinal: 3 = three; → ordinal: 3rd, third;
  • cardinal: 4 = four; → ordinal: 4th, fourth;
  • cardinal: 5 = five; → ordinal: 5th, fifth;
  • cardinal: 6 = six; → ordinal: 6th, sixth;
  • cardinal: 7 = seven; → ordinal: 7th, seventh;
  • cardinal: 8 = eight; → ordinal: 8th, eighth;
  • cardinal: 9 = nine; → ordinal: 9th, ninth;
  • cardinal: 10 = ten; → ordinal: 10th, tenth;
  • cardinal: 11 = eleven; → ordinal: 11th, eleventh;
  • cardinal: 12 = twelve; → ordinal: 12th, twelfth;
  • cardinal: 13 = thirteen; → ordinal: thirteenth;
  • cardinal: 14 = fourteen; → ordinal: 14th, fourteenth;
  • cardinal: 15 = fifteen; → ordinal: 15th, fifteenth;
  • cardinal: 16 = sixteen; → ordinal: 16th, sixteenth;
  • cardinal: 17 = seventeen; → ordinal: 17th, seventeenth;
  • cardinal: 18 = eighteen; → ordinal: 18th, eighteenth;
  • cardinal: 19 = nineteen; → ordinal: 19th, nineteenth;

» Full article: how to write out ordinal numbers in words in (US) American English, using letters instead of numerals