Números Cardinais e Ordinais em Inglês

Guia Completo de Matemática e Escrita Acesso Liberado pelo Professor

Números Cardinais e Ordinais em Inglês

Aprenda a contar, escrever, pronunciar e aplicar números cardinais (one, two, three...) e ordinais (first, second, third...), incluindo regras de hífens, pontuação e leitura de grandes quantidades e anos.

Regras de Ouro para Usar Números em Inglês

Guia Gramatical

1, 2, 3

1. Cardinais vs Ordinais

• Cardinais: Indicam quantidade (ex: I have three guitars).
• Ordinais: Indicam ordem ou posição (ex: This is my third lesson).

21-99

2. Uso Obrigatório do Hífen

Do número 21 ao 99, use hífen para unir a dezena e a unidade (ex: twenty-one, forty-five, seventy-eighth).

-st -nd

3. Sufixos de Ordinais

• 1st = -st (first)
• 2nd = -nd (second)
• 3rd = -rd (third)
• 4th em diante = -th (fourth, fifth)

1,000

4. Vírgula e Ponto (Invertidos)

Em inglês, a vírgula separa milhares (ex: 1,000 = mil) e o ponto indica decimais (ex: $3.50 = três dólares e cinquenta).

2026

5. Como Ler Anos em Inglês

Divide-se o ano em duas partes:
• 1998 = nineteen ninety-eight
• 2026 = twenty twenty-six

May 4th

6. Datas em Inglês

Datas sempre usam números ordinais na pronúncia:
• Escreve-se: May 4th ou 4 May
• Fala-se: May the fourth

Tabela Completa de Números Cardinais (Cardinal Numbers)

Contagem e Quantidades

Algarismo	Escrita em Inglês	Tradução (Português)	Exemplo de Uso em Frase
0	Zero	Zero	The temperature is zero degrees.
1	One	Um / Uma	I have one acoustic guitar.
2	Two	Dois / Duas	She bought two English books.
3	Three	Três	We practiced for three hours.
4	Four	Quatro	There are four seasons in a year.
5	Five	Cinco	He works five days a week.
6	Six	Seis	A guitar has six strings.
7	Seven	Sete	There are seven days in a week.
8	Eight	Oito	Class starts at eight o'clock.
9	Nine	Nove	Nine students finished the test.
10	Ten	Dez	I got ten points in grammar.
11	Eleven	Onze	The clock struck eleven.
12	Twelve	Doze	A dozen means twelve items.
13	Thirteen	Treze	He is thirteen years old.
14	Fourteen	Quatorze / Catorze	Fourteen days make a fortnight.
15	Fifteen	Quinze	We take a fifteen-minute break.
16	Sixteen	Dezesseis	She will turn sixteen tomorrow.
17	Seventeen	Dezessete	Seventeen people joined the class.
18	Eighteen	Dezoito	You become an adult at eighteen.
19	Nineteen	Dezenove	The store opens at nineteen hours.
20	Twenty	Vinte	There are twenty students here.
21	Twenty-one	Vinte e um	Blackjack is also called twenty-one.
22	Twenty-two	Vinte e dois	Chapter twenty-two is short.
30	Thirty	Trinta	Thirty minutes is half an hour.
40	Forty	Quarenta	Forty workers attended the meeting.
50	Fifty	Cinquenta	The speed limit is fifty mph.
60	Sixty	Sessenta	Sixty seconds make one minute.
70	Seventy	Setenta	My grandfather is seventy years old.
80	Eighty	Oitenta	The museum is eighty miles away.
90	Ninety	Noventa	Ninety percent of students passed.
100	One hundred	Cem / Um cento	A century has one hundred years.
101	One hundred and one	Cem e um	This is English 101.
200	Two hundred	Duzentos	The concert hall holds two hundred people.
500	Five hundred	Quinhentos	Five hundred miles is a famous song.
1,000	One thousand	Um mil	One thousand grams equals one kilo.
10,000	Ten thousand	Dez mil	Ten thousand fans came to the arena.
100,000	One hundred thousand	Cem mil	The city has one hundred thousand citizens.
1,000,000	One million	Um milhão	One million people live in this state.
1,000,000,000	One billion	Um bilhão	The company value reached one billion.
1,000,000,000,000	One trillion	Um trilhão	Astronomers count stars in trillions.

Tabela Completa de Números Ordinais (Ordinal Numbers)

Ordem, Posição e Datas

Abreviação	Escrita em Inglês	Tradução (Português)	Exemplo de Uso em Frase
1st	First	Primeiro(a)	This is my first English lesson.
2nd	Second	Segundo(a)	He finished in second place.
3rd	Third	Terceiro(a)	The office is on the third floor.
4th	Fourth	Quarto(a)	July fourth is American Independence Day.
5th	Fifth	Quinto(a)	She celebrated her fifth birthday.
6th	Sixth	Sexto(a)	Friday is the sixth day of the week.
7th	Seventh	Sétimo(a)	We live on the seventh avenue.
8th	Eighth	Oitavo(a)	He won his eighth medal.
9th	Ninth	Nono(a)	It is the ninth edition of the festival.
10th	Tenth	Décimo(a)	Today is our tenth anniversary.
11th	Eleventh	Décimo primeiro(a)	November is the eleventh month.
12th	Twelfth	Décimo segundo(a)	December is the twelfth month.
13th	Thirteenth	Décimo terceiro(a)	Friday the thirteenth is famous.
14th	Fourteenth	Décimo quarto(a)	Valentine's Day is on February fourteenth.
15th	Fifteenth	Décimo quinto(a)	Her fifteenth birthday was grand.
16th	Sixteenth	Décimo sexto(a)	He lives in the sixteenth district.
17th	Seventeenth	Décimo sétimo(a)	Saint Patrick's Day is March seventeenth.
18th	Eighteenth	Décimo oitavo(a)	This building was built in the eighteenth century.
19th	Nineteenth	Décimo nono(a)	The nineteenth century had big discoveries.
20th	Twentieth	Vigésimo(a)	We live in the twenty-first century, past the twentieth.
21st	Twenty-first	Vigésimo primeiro(a)	Welcome to the twenty-first century.
22nd	Twenty-second	Vigésimo segundo(a)	It is her twenty-second birthday.
23rd	Twenty-third	Vigésimo terceiro(a)	His birthday is May twenty-third.
30th	Thirtieth	Trigésimo(a)	They reached their thirtieth year of marriage.
40th	Fortieth	Quadragésimo(a)	It is the fortieth anniversary.
50th	Fiftieth	Quinquagésimo(a)	Hawaii was the fiftieth US state.
60th	Sixtieth	Sexagésimo(a)	A diamond jubilee marks a sixtieth year.
70th	Seventieth	Septuagésimo(a)	The nation celebrated its seventieth year.
80th	Eightieth	Octogésimo(a)	Grandma had an eightieth birthday party.
90th	Ninetieth	Nonagésimo(a)	He scored in the ninetieth minute.
100th	One hundredth	Centésimo(a)	This is our one hundredth episode.
1,000th	One thousandth	Milésimo(a)	He was the one thousandth customer.
1,000,000th	One millionth	Milionésimo(a)	She won as the one millionth user.