What is Eighty-Seven (87)? | Simple Explanation for Class 5-10

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What is Eighty-Seven?

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

Eighty-seven is a whole number that comes after eighty-six and before eighty-eight. It can be written as the numeral '87'. It represents a quantity of 8 tens and 7 ones.

Simple Example

Quick Example

Imagine you are counting your cricket cards. If you have 8 bundles of 10 cards each, and then 7 more loose cards, you have a total of eighty-seven cricket cards.

Worked Example

Step-by-Step

Let's find out how many items make eighty-seven.
1. Start with 8 groups of ten. This means 10 + 10 + 10 + 10 + 10 + 10 + 10 + 10 = 80.
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2. Now, add 7 more individual items to this amount.
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3. So, 80 + 7 = 87.
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Answer: Eighty-seven is made up of 8 tens and 7 ones.

Why It Matters

Understanding numbers like eighty-seven is fundamental for counting, doing calculations, and managing money in daily life. This basic number sense is crucial for careers in finance, engineering, and even in managing a small business like a chai stall or a grocery shop.

Common Mistakes

MISTAKE: Confusing eighty-seven (87) with seventy-eight (78). | CORRECTION: Remember that 'eighty' means 8 tens, and 'seventy' means 7 tens. The order of the digits matters.

MISTAKE: Writing eighty-seven as 807. | CORRECTION: When we say 'eighty-seven', the 'seven' is added to 'eighty', not placed after it as a separate hundreds digit. It's 8 tens and 7 ones.

MISTAKE: Not understanding that 87 is larger than 78. | CORRECTION: Compare the tens digit first. 8 tens is more than 7 tens, so 87 is greater than 78.

Practice Questions

Try It Yourself

QUESTION: If you have 8 bundles of 10 pencils and 7 single pencils, how many pencils do you have in total? | ANSWER: 87 pencils

QUESTION: Write the number that comes just before eighty-seven. | ANSWER: Eighty-six (86)

QUESTION: An auto-rickshaw fare is ₹87. If you give the driver a ₹100 note, how much change should you get back? | ANSWER: ₹13 (100 - 87 = 13)

MCQ

Quick Quiz

Which of these represents eighty-seven?

807

8+7

The Correct Answer Is:

Option C, '87', is the correct numeral for eighty-seven, which means 8 tens and 7 ones. Options A, B, and D represent different numbers or operations.

Real World Connection

In the Real World

You see numbers like eighty-seven everywhere in India! For example, a cricket player's score might be 87 runs. Your mobile data pack might have 87 GB left. You might pay ₹87 for groceries using UPI, or a bus ticket could cost ₹87. It's a common value in everyday transactions and measurements.

Key Vocabulary

Key Terms

WHOLE NUMBER: A number without fractions or decimals, like 1, 2, 3... | NUMERAL: A symbol or name that stands for a number (e.g., '87' is a numeral) | TENS PLACE: The second digit from the right in a number, representing groups of ten | ONES PLACE: The first digit from the right in a number, representing single units

What's Next

What to Learn Next

Now that you understand what eighty-seven is, you can explore other numbers and learn about addition, subtraction, and place value. These are exciting steps that will help you solve bigger math problems!