What is One Hundred Twenty?

S0-SA1-1088

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

One Hundred Twenty is a whole number that comes after 119 and before 121. It represents the quantity of 12 tens or 120 ones. In numbers, it is written as 120.

Simple Example

Quick Example

Imagine you have 10 packets of biscuits, and each packet has 12 biscuits. If you count all the biscuits together, you will have one hundred twenty biscuits in total. That's 120 biscuits!

Worked Example

Step-by-Step

Let's say your school library has 10 shelves, and each shelf has 12 storybooks. How many storybooks are there in total?

Step 1: Identify the number of shelves: 10
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Step 2: Identify the number of books on each shelf: 12
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Step 3: To find the total, multiply the number of shelves by the number of books per shelf: 10 x 12
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Step 4: Calculate the product: 10 x 12 = 120
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Answer: There are 120 storybooks in the library.

Why It Matters

Understanding numbers like 120 is crucial for daily calculations and problem-solving. It's a foundational step for learning bigger numbers, multiplication, and division. Accountants use such numbers to track money, while engineers use them to measure materials.

Common Mistakes

MISTAKE: Writing 'one hundred twenty' as 10020 | CORRECTION: The 'twenty' replaces the last two zeros of 'one hundred' in your mind. It should be 120, not 10020.

MISTAKE: Confusing 120 with 1200 or 12 | CORRECTION: Remember the place value. 120 has three digits: 1 (hundreds), 2 (tens), 0 (ones). 1200 has four digits, and 12 has two.

MISTAKE: Reading 120 as 'twelve zero' | CORRECTION: Always read the full number. 120 is 'one hundred twenty'. The zero at the end is important for its place value.

Practice Questions

Try It Yourself

QUESTION: What number comes just before one hundred twenty? | ANSWER: 119

QUESTION: If you have 12 groups of 10 students each, how many students are there in total? | ANSWER: 120 students

QUESTION: Your mom bought 5 packs of laddoos, and each pack has 24 laddoos. How many laddoos did she buy in total? | ANSWER: 120 laddoos (5 x 24 = 120)

MCQ

Quick Quiz

Which of these represents 'one hundred twenty'?

10020

120

1200

201

The Correct Answer Is:

120 is the correct way to write 'one hundred twenty'. Options A, C, and D represent different numbers: ten thousand twenty, one thousand two hundred, and two hundred one respectively.

Real World Connection

In the Real World

When you check your mobile phone bill, you might see that you used 120 minutes of talk time or 120 MB of data. Also, cricket scores often go above 100, and a team might score 120 runs in an innings, which is a common and important milestone.

Key Vocabulary

Key Terms

WHOLE NUMBER: A number without fractions or decimals (like 0, 1, 2, 3...) | PLACE VALUE: The value of a digit based on its position in a number (e.g., in 120, the '1' is in the hundreds place) | QUANTITY: The amount or number of something | DIGIT: A single symbol used to make numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9)

What's Next

What to Learn Next

Great job understanding 120! Now you're ready to explore even larger numbers, like 'one hundred twenty-one' and beyond. This will help you count bigger collections and solve more complex math problems.