Vocabulary: Numbers

Numbers are essential in daily communication, whether you’re telling time, counting objects, or discussing prices. This post will help you understand and use different types of numbers in English effectively.

🔢 Types of Numbers

1. Cardinal Numbers (Counting numbers):

   • Used to count objects or indicate quantities.
   • Examples:
     • 1 (one), 2 (two), 3 (three), 4 (four), 5 (five), 6 (six), 7 (seven), 8 (eight), 9 (nine), 10 (ten)
     • Larger numbers: 20 (twenty), 50 (fifty), 100 (one hundred), 1,000 (one thousand), 1,000,000 (one million)
   • Example Sentence: I have three apples.

2. Ordinal Numbers (Order or position):

   • Used to show the order of things in a series.
   • Examples:
     • 1st (first), 2nd (second), 3rd (third), 4th (fourth), 5th (fifth)
     • Larger numbers: 21st (twenty-first), 50th (fiftieth), 100th (one hundredth)
   • Example Sentence: She finished first in the race.

3. Decimal Numbers (Fractions and percentages):

   • Represent parts of a whole or precise measurements.
   • Examples:
     • 0.5 (zero point five), 1.75 (one point seventy-five), 3.14 (three point one four)
   • Example Sentence: The result was 4.5 out of 5.

4. Fractions:

   • Represent parts of a whole.
   • Examples:
     • 1/2 (one-half), 1/3 (one-third), 3/4 (three-fourths), 5/8 (five-eighths)
   • Example Sentence: I ate half of the pizza.

5. Percentages:

   • Used to describe proportions out of 100.
   • Examples:
     • 25% (twenty-five percent), 50% (fifty percent), 100% (one hundred percent)
   • Example Sentence: He scored 80% on the test.

6. Negative Numbers:

   • Represent values less than zero.
   • Examples:
     • -5 (negative five), -10 (negative ten)
   • Example Sentence: The temperature dropped to -3°C last night.

🔠 Special Number Vocabulary

1. Even Numbers: Divisible by 2. (Example: 2, 4, 6, 8, 10)
2. Odd Numbers: Not divisible by 2. (Example: 1, 3, 5, 7, 9)
3. Prime Numbers: Greater than 1 and divisible only by 1 and itself. (Example: 2, 3, 5, 7, 11)
4. Composite Numbers: Have more than two factors. (Example: 4, 6, 8, 9)
5. Roman Numerals: Numbers used in ancient Rome. (Example: I (1), V (5), X (10), L (50), C (100), D (500), M (1,000))

🗣️ Vocabulary in Practice

Example Sentences:

1. Cardinal Numbers: There are twenty students in the class.
2. Ordinal Numbers: My birthday is on the 15th of June.
3. Decimal Numbers: The fuel efficiency is 15.7 kilometers per liter.
4. Fractions: Divide the cake into four equal parts; I’ll take one-fourth.
5. Percentages: Nearly 90% of the audience enjoyed the movie.
6. Negative Numbers: The account balance is negative two dollars.

💬 Practice Questions:

1. What is the ordinal form of the number 12? (Answer: Twelfth)
2. How would you say 3.25 in English? (Answer: Three point two five)
3. Is 17 an odd or even number? (Answer: Odd)

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Master numbers in English to talk about time, money, and quantities like a pro! 🌟