The number thirty represents a specific quantity. It's what you get when you multiply three by ten.
For example, if you have three groups of ten items, you would have thirty items in total.
It's often used when talking about ages, like "She is thirty years old," or quantities, such as "There are thirty days in April."
Essentially, it's a way to express a count that's larger than twenty-nine but smaller than thirty-one.
The number thirty represents a specific quantity, precisely three times the value of ten. It's a fundamental cardinal number used for counting and expressing amounts.
You'll encounter 'thirty' frequently when discussing ages, quantities of items, or measurements. For example, someone might say, "I am thirty years old," or "There are thirty students in the class."
Understanding 'thirty' is crucial for everyday communication and mathematical contexts, forming a building block for larger numbers.
The number thirty, written numerically as 30, represents a quantity that is three times the value of ten. It is a fundamental cardinal number, crucial for counting and expressing quantities in various contexts.
§ Common Mispronunciations
One of the most frequent mistakes learners make with thirty is its pronunciation. English numbers can be tricky, especially those ending in '-ty' versus those ending in '-teen'. For thirty, the 'th' sound is often mispronounced, either by being omitted entirely or by being replaced with an 'f' or 't' sound. The 'ir' sound can also be challenging, sometimes being flattened or pronounced incorrectly as 'er' or 'uh'.
I'll meet you at thirty past three.
§ Confusing 'thirty' with 'thirteen'
A very common error, especially for beginners, is confusing thirty with 'thirteen'. While they sound similar, their meanings are vastly different. Thirty refers to three tens, whereas thirteen refers to one ten and three. This distinction is crucial in everyday communication, from telling time to discussing ages or quantities.
- DEFINITION
- The number equivalent to three times ten.
The bus arrives at thirty past the hour.
Understanding the stress pattern can help. Numbers ending in '-ty' (like thirty) usually have the stress on the first syllable, while numbers ending in '-teen' (like thirteen) have the stress on the second syllable.
§ Incorrect Usage in Context
While thirty is a straightforward number, learners sometimes misuse it in contexts where other numerical expressions might be more natural or precise. For example, when talking about age, saying 'I am thirty' is perfectly correct. However, when referring to an amount of something, it's important to include the noun, e.g., 'thirty minutes', 'thirty dollars'. Omitting the noun can make the sentence sound incomplete or awkward.
The recipe calls for thirty grams of flour.
Another common mistake involves using thirty as an ordinal number when a cardinal number is needed, or vice-versa. Thirty is a cardinal number, meaning it expresses quantity (e.g., 'there are thirty students'). The ordinal form is 'thirtieth' (e.g., 'the thirtieth day of the month').
- DEFINITION
- An adjective referring to the number equivalent to three times ten.
§ Spelling Errors
While less common for native speakers, learners sometimes make spelling errors when writing thirty. Common mistakes include 'thirthy', 'thrity', or 'thridy'. The correct spelling maintains the 'r' before the 't' and the 'y' at the end.
She waited for thirty minutes.
Paying attention to the sequence of letters, especially the 'i' and 'r' can help avoid these common errors. It's a good practice to write out numbers to solidify their correct spelling.
§ Colloquial vs. Formal Usage
Although thirty is a basic number, understanding its usage in different contexts can prevent miscommunication. In formal writing, it's generally preferred to write out numbers like thirty rather than using the numeral '30', especially at the beginning of a sentence or for smaller numbers. However, in technical or data-heavy contexts, using numerals is common.
Correct: "Thirty students attended the lecture."
Less formal but acceptable: "30 students attended the lecture."
Being aware of the audience and purpose of your communication can guide your choice between writing out the word or using the numeral. For an A1 level, focusing on correctly speaking and understanding the word is the primary goal, but awareness of these nuances is beneficial for future learning.
- DEFINITION
- A cardinal number, indicating a quantity of three tens.
よく使う組み合わせ
よく使うフレーズ
I'll be thirty soon.
Saya akan berusia tiga puluh tahun segera.
The meeting starts at thirty past nine.
Rapat dimulai pada pukul sembilan lewat tiga puluh.
She has thirty books.
Dia memiliki tiga puluh buku.
It's thirty degrees outside.
Suhu di luar tiga puluh derajat.
I waited for thirty minutes.
Saya menunggu selama tiga puluh menit.
He is thirty years old.
Dia berusia tiga puluh tahun.
About thirty people came.
Sekitar tiga puluh orang datang.
Give me thirty seconds.
Beri saya tiga puluh detik.
The price is thirty euros.
Harganya tiga puluh euro.
I need thirty copies.
Saya membutuhkan tiga puluh salinan.
使い方
The word "thirty" is a cardinal number. It is used to indicate a quantity of 30.
Examples:
- There are thirty days in November.
- She waited for thirty minutes.
- He is thirty years old.
1. **Confusing 'thirty' with 'thirteen'**: These two words sound similar but represent different numbers (30 vs. 13).
2. **Incorrect spelling**: Sometimes people misspell it as 'thirthy' instead of 'thirty'.
3. **Using 'thirty' for ordinal numbers**: 'Thirty' is a cardinal number. For ordinal numbers (to indicate position), use 'thirtieth'.
実生活で練習する
実際の使用場面
How old are you?
- I am thirty years old.
- She is thirty.
- He turned thirty last week.
How much does it cost?
- It costs thirty dollars.
- The price is thirty euros.
- It's thirty pounds.
What time is it?
- It's thirty past two.
- The meeting starts at thirty minutes.
- The clock shows thirty.
How many items do you need?
- I need thirty apples.
- There are thirty students.
- We ordered thirty chairs.
How far is it?
- It's thirty kilometers away.
- The distance is thirty miles.
- It's about thirty minutes by car.
会話のきっかけ
"What is something you would like to do when you are thirty?"
"If you had thirty minutes to do anything, what would you do?"
"Can you think of anything that comes in groups of thirty?"
"What's a fun fact about the number thirty?"
"Have you ever seen something that cost thirty of a currency unit?"
日記のテーマ
Describe what you think your life will be like when you are thirty years old.
Write about a time you counted to thirty, or saw something with thirty of an item.
If you had thirty wishes, what would you wish for?
Imagine you have thirty minutes to prepare for a big event. What would you do?
Reflect on what it means to be 'thirty-something' and what life stages that might represent.
自分をテスト 12 問
My grandmother is ___ years old next month.
The correct number to complete the sentence is 'thirty', indicating the grandmother's age.
There are ___ days in November.
November has 30 days. 'Thirty' is the correct number.
A group of ___ students went on the school trip.
The sentence requires a number of students. 'Thirty' is a suitable choice.
The book has ___ chapters.
To complete the sentence, a number of chapters is needed. 'Thirty' fits grammatically.
I need to save ___ dollars for the new bicycle.
The sentence requires a numerical amount for saving. 'Thirty' is a reasonable amount.
The concert starts in ___ minutes.
The sentence needs a time duration. 'Thirty' minutes is a common interval.
Imagine you are planning a surprise birthday party for a friend who is turning thirty. Write a short email to another friend, inviting them and mentioning at least three details about the party. (e.g., date, time, location, theme, gifts).
Well written! Good try! Check the sample answer below.
Sample answer
Subject: Surprise Party for [Friend's Name]! Hey [Friend's Name], Guess what? We're throwing a surprise birthday party for [Mutual Friend's Name]! They're turning thirty, and we want to make it super special. It's going to be on [Date] at [Time] at [Location]. The theme is [Theme], so dress accordingly! We're planning to pool money for a gift, or you can bring something small if you prefer. Please RSVP by [Date] so we can get a headcount. Don't tell [Mutual Friend's Name]! Best, [Your Name]
You are writing a short diary entry about a significant event that happened when you were approximately thirty years old. Describe the event and how it impacted you. Use 'thirty' in your entry.
Well written! Good try! Check the sample answer below.
Sample answer
October 26th, [Year] Today marks another year, and I can't believe I'm thirty now. It feels like just yesterday I was graduating college. This past year has been a whirlwind, especially with starting my own business. It was a huge risk, but looking back, it was one of the best decisions I made. It taught me so much about resilience and determination, and I truly feel like I've found my purpose. I'm excited to see what the next thirty years bring!
Write a short paragraph comparing and contrasting your life at twenty years old versus thirty years old. Focus on changes in responsibilities, perspectives, or priorities. Be sure to use the word 'thirty'.
Well written! Good try! Check the sample answer below.
Sample answer
When I was twenty, my main concerns were academics and social life, with a strong focus on immediate gratification. However, now that I'm thirty, my priorities have shifted significantly. I'm much more focused on career development, financial stability, and building a secure future. My responsibilities have grown, and I find myself thinking more about long-term goals rather than short-term pleasures. It's a different kind of freedom, but a more fulfilling one.
What is the age range for the international exchange program?
Read this passage:
Sarah was excited. She had just received the news that her application for the international exchange program had been accepted! The program was designed for young professionals between the ages of twenty-five and thirty-five. Sarah, who was twenty-eight, felt it was the perfect opportunity to broaden her horizons and gain valuable experience abroad. She quickly started making plans for her year-long adventure.
What is the age range for the international exchange program?
The passage explicitly states 'The program was designed for young professionals between the ages of twenty-five and thirty-five.'
The passage explicitly states 'The program was designed for young professionals between the ages of twenty-five and thirty-five.'
How many times would the clock chime in the evening?
Read this passage:
The old clock in the town square had been chiming for over a century. Every hour, on the hour, it would strike, its deep tones echoing through the streets. Locals often used its chimes to mark their day. At midday, it would strike twelve times, and in the evening, it would often strike as many as thirty times, depending on the time.
How many times would the clock chime in the evening?
The passage states, 'in the evening, it would often strike as many as thirty times, depending on the time.'
The passage states, 'in the evening, it would often strike as many as thirty times, depending on the time.'
How old is Mark in the passage?
Read this passage:
Mark had been working at the company for nearly ten years. He started right after college, eager to make his mark. Now, at the age of thirty, he was considered one of the most reliable and experienced members of the team. He had seen many changes over the decade, but his dedication remained unwavering.
How old is Mark in the passage?
The passage states, 'Now, at the age of thirty, he was considered one of the most reliable and experienced members of the team.'
The passage states, 'Now, at the age of thirty, he was considered one of the most reliable and experienced members of the team.'
/ 12 correct
Perfect score!
例文
There are thirty days in November.
関連コンテンツ
文脈で学ぶ
この単語を他の言語で
関連フレーズ
generalの関連語
a lot of
A2たくさんの、あるいは多くのという意味。数や量がたくさんあるときに使うよ。
about
A1'about'は、何かの話題について話すときや、おおよその量を表すときに使います。
above
A2何かの真上にある、より高い位置を示します。
accident
A2予期せず起こる悪い出来事で、損害や怪我につながることがあるものです。
action
A2目標を達成するために何かを実際に行うことだよ。
after
A2'after'は、時間的または場所的に、何かの後であることを意味します。
afterward
A2At a later or subsequent time.
again
A2'again'は、何かがもう一度起こる、繰り返されることを意味します。
aged
B1ある特定の年齢であること。人や物の年齢を表す時に使うよ。
alive
A2死んでおらず、生命活動をしている状態。
