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What is Eighteen?
Grade Level:
Pre-School – Class 2
All domains without exception
Definition
What is it?
Eighteen is a whole number that comes after seventeen and before nineteen. It is written as '18' in digits and 'eighteen' in words. Eighteen is an even number, meaning it can be divided exactly by 2.
Simple Example
Quick Example
Imagine you have two teams playing a cricket match. If each team scores 9 runs, then the total runs scored by both teams together would be 9 + 9 = 18 runs.
Worked Example
Step-by-Step
Let's say your aunt gave you some money for your birthday. She gave you a 10 Rupee note and an 8 Rupee coin (or eight 1 Rupee coins). How much money do you have in total?
---Step 1: Identify the amounts given. You have 10 Rupees and 8 Rupees.
---Step 2: To find the total, you need to add these amounts together.
---Step 3: Add the numbers: 10 + 8.
---Step 4: Count forward 8 steps from 10: 11, 12, 13, 14, 15, 16, 17, 18.
---Step 5: So, 10 + 8 = 18.
Answer: You have 18 Rupees in total.
Why It Matters
Understanding numbers like eighteen is fundamental to all of mathematics and science. It helps us count, measure, and solve problems in daily life. Knowing numbers is crucial for careers like banking, engineering, and even running a small shop, where you constantly deal with quantities and money.
Common Mistakes
MISTAKE: Confusing eighteen (18) with eighty (80) or eight (8). | CORRECTION: Remember that 'teen' numbers are between 13 and 19. Eighty is a much larger number, and eight is a single-digit number.
MISTAKE: Incorrectly counting past seventeen or before nineteen. | CORRECTION: Always remember the sequence: ..., 16, 17, 18, 19, 20, ...
MISTAKE: Writing 'eighteen' as 'eighty-een' or 'eight-teen'. | CORRECTION: The correct spelling is 'eighteen', without a hyphen and with the 'gh' sound.
Practice Questions
Try It Yourself
QUESTION: If you have 10 marbles and your friend gives you 8 more, how many marbles do you have in total? | ANSWER: 18 marbles
QUESTION: A bus has 12 seats. If 6 more seats are added, how many seats are there now? | ANSWER: 18 seats
QUESTION: Your mom bought 3 packets of biscuits. Each packet has 6 biscuits. How many biscuits are there in total? | ANSWER: 18 biscuits
MCQ
Quick Quiz
Which of these numbers is eighteen?
8
80
18
108
The Correct Answer Is:
C
Option C, '18', is the correct way to write eighteen in digits. Options A, B, and D represent eight, eighty, and one hundred eight, respectively.
Real World Connection
In the Real World
In India, eighteen is a very important age! It's the legal age to get a driving license, vote in elections, and even open a bank account independently. So, when you turn 18, you gain many new responsibilities and rights in society.
Key Vocabulary
Key Terms
NUMBER: A count or measure | DIGIT: A single symbol used to write numbers (like 0, 1, 2...) | EVEN NUMBER: A whole number that can be divided by 2 without a remainder | WHOLE NUMBER: Numbers like 0, 1, 2, 3... (no fractions or decimals)
What's Next
What to Learn Next
Great job understanding eighteen! Next, you can explore numbers beyond nineteen, like twenty, and learn about place value (tens and ones). This will help you understand how larger numbers are formed and make calculations easier.
