Thirty is the cardinal number 30, used frequently in everyday English for various quantitative expressions.
Palavra em 30 segundos
- Represents the number 30.
- Used for counting, age, time, and measurements.
- A basic and common English numeral.
Overview
Thirty is a fundamental cardinal number in English, representing the quantity of 30. It is a key component of the number system, used extensively in counting, measuring, and expressing quantities. As a basic numeral, it is typically one of the first numbers learned by English language learners.
Thirty is used in various contexts, primarily for counting objects, indicating age, specifying time, and denoting measurements. It follows the pattern of tens (ten, twenty, thirty, forty, etc.) and precedes forty. It can be used as a standalone number or as part of larger numbers (e.g., thirty-five).
Counting: 'I have thirty books.'
Age: 'She is thirty years old.'
Time: 'The meeting starts at thirty minutes past the hour.' (though 'half past' is more common)
Measurements: 'The room is thirty feet long.'
Prices: 'The ticket costs thirty dollars.'
Three is the number 3. Thirty is ten times the value of three (3 x 10 = 30).
Thirteen represents the number 13, while thirty represents 30. They sound similar but have very different numerical values.
Thirty-three is a compound number (33), whereas thirty is simply 30. Thirty is the base number for all numbers from thirty to thirty-nine.
Exemplos
My brother turned thirty last week.
everydayMi hermano cumplió treinta la semana pasada.
The project deadline is the thirtieth of April.
formalLa fecha límite del proyecto es el treinta de abril.
It costs about thirty bucks.
informalCuesta como treinta dólares.
The study involved thirty participants from diverse backgrounds.
academicEl estudio involucró a treinta participantes de diversos orígenes.
Colocações comuns
Frases Comuns
thirty-something
treinta y tantos
thirty minutes past
treinta minutos después de
at thirty
a los treinta
Frequentemente confundido com
Thirteen represents the number 13 (1 and 3), while thirty represents the number 30 (3 and 0). They sound similar, especially the '-teen' and '-ty' endings, but are numerically distinct.
Three is the number 3. Thirty is ten times the value of three (3 x 10 = 30). They share the first letter but have different spellings and values.
Padrões gramaticais
How to Use It
Notas de uso
Thirty is a very common numeral used across all registers of English. It is typically written as a word ('thirty') in less formal contexts or when emphasizing the number itself. In more technical or financial documents, the numeral '30' is often preferred.
Erros comuns
Learners sometimes confuse the spelling of thirty with 'thir-tee' or 'thir-tey'. Remember the 'ir' and the 'ty' ending. Also, differentiating 'thirty' (30) from 'thirteen' (13) is crucial.
Tips
Practice Counting Past Twenty
Focus on mastering the numbers from twenty to one hundred. Thirty is a key stepping stone in this sequence.
Thirty vs. Thirteen
Be careful not to confuse 'thirty' (30) with 'thirteen' (13), as they sound similar but represent very different quantities.
Milestone Ages
In many cultures, reaching the age of thirty is considered a significant milestone, often marking the transition into full adulthood or a new phase of life.
Origem da palavra
The word 'thirty' comes from the Old English 'þrītig', which is derived from 'þrī' meaning 'three' and a suffix indicating 'ten'. It essentially means 'three tens'.
Contexto cultural
The age of thirty is often seen as a significant milestone in many Western cultures, marking a transition into a new decade of adulthood. It's sometimes associated with settling down or reaching a certain level of maturity.
Dica de memorização
Think of 'thirty' as 'three' and 'ty' (like 'tie'). Imagine tying three things together to get the number 30. Or, remember that thirty is 'three tens'.
Perguntas frequentes
4 perguntasThe word 'thirty' is spelled T-H-I-R-T-Y. It's important to note the 'ir' combination in the middle.
The number that comes immediately before thirty is twenty-nine (29). The number that comes immediately after thirty is thirty-one (31).
Whether thirty is considered 'large' depends on the context. In everyday situations like counting items or age, it's a moderate number. In contexts like population size or distance, it would be considered small.
Thirty is often used to indicate the half-hour mark. For example, 'half past two' is the same as 'two thirty'.
Teste-se
There are ___ days in June.
June has exactly 30 days.
Which of these represents thirty?
Thirty is the number 30.
Build a sentence using 'old', 'is', 'she', 'thirty', 'years'.
This is the standard grammatical structure for stating someone's age.
Pontuação: /3
Summary
Thirty is the cardinal number 30, used frequently in everyday English for various quantitative expressions.
- Represents the number 30.
- Used for counting, age, time, and measurements.
- A basic and common English numeral.
Practice Counting Past Twenty
Focus on mastering the numbers from twenty to one hundred. Thirty is a key stepping stone in this sequence.
Thirty vs. Thirteen
Be careful not to confuse 'thirty' (30) with 'thirteen' (13), as they sound similar but represent very different quantities.
Milestone Ages
In many cultures, reaching the age of thirty is considered a significant milestone, often marking the transition into full adulthood or a new phase of life.
Exemplos
4 de 4My brother turned thirty last week.
Mi hermano cumplió treinta la semana pasada.
The project deadline is the thirtieth of April.
La fecha límite del proyecto es el treinta de abril.
It costs about thirty bucks.
Cuesta como treinta dólares.
The study involved thirty participants from diverse backgrounds.
El estudio involucró a treinta participantes de diversos orígenes.
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about
A1'About' significa 'sobre' quando se fala de um assunto, ou 'aproximadamente' para indicar uma quantidade.
above
A2Indica uma posição mais alta do que outra coisa, logo acima.
accident
A2Um evento infeliz que causa danos ou ferimentos.
action
A2É o processo de fazer algo, geralmente para atingir um objetivo.
after
A2'After' significa 'depois', indicando que algo acontece em seguida a outra coisa, no tempo ou no espaço.
afterward
A2At a later or subsequent time.
again
A2'Again' significa 'novamente' ou 'mais uma vez', indicando que algo se repete.
aged
B1Usado para indicar a idade específica de alguém ou de alguma coisa.
alive
A2Algo que tem vida, que não está morto.
all
A2'All' refere-se à totalidade de algo, a cada parte ou unidade sem exceção.
