What is The Number 78?

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Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

The number 78 is a natural number that comes after 77 and before 79. It is a two-digit number, meaning it has a 'tens' place (7) and a 'ones' place (8).

Simple Example

Quick Example

Imagine you are playing a cricket match with your friends. If your team scores 78 runs in total, it means you have scored seventy-eight runs. This number helps you keep track of the score.

Worked Example

Step-by-Step

Let's count up to 78.
1. Start counting from 70: 70.
2. Add one: 71.
3. Add one more: 72.
4. Continue adding one each time: 73, 74, 75, 76, 77.
5. Add one last time: 78.
So, 78 is the eighth number after 70.

Why It Matters

Understanding numbers like 78 is fundamental for all of mathematics, from basic counting to complex calculations. It's crucial for careers like banking (managing money), engineering (measuring things), and even retail (counting products).

Common Mistakes

MISTAKE: Confusing 78 with 87. | CORRECTION: Remember that the 'tens' digit comes first. 78 means seven tens and eight ones, while 87 means eight tens and seven ones.

MISTAKE: Saying 'seventy-eighty' instead of 'seventy-eight'. | CORRECTION: The 'tens' part is 'seventy', and the 'ones' part is 'eight'. Combine them as 'seventy-eight'.

MISTAKE: Thinking 78 is a single digit. | CORRECTION: 78 is a two-digit number because it uses two digits (7 and 8) to represent its value.

Practice Questions

Try It Yourself

QUESTION: What number comes just before 78? | ANSWER: 77

QUESTION: If you have 78 rupees and you spend 5 rupees, how many rupees do you have left? | ANSWER: 73 rupees

QUESTION: A bus has 78 seats. If 70 seats are already taken, how many seats are empty? | ANSWER: 8 seats

MCQ

Quick Quiz

Which of these represents the number 78?

Seven and eight

Seven tens and eight ones

Eight tens and seven ones

Seventy-eighty

The Correct Answer Is:

Option B is correct because 78 is made up of 7 tens (70) and 8 ones (8). Options A and D are incorrect ways of saying the number, and Option C describes 87.

Real World Connection

In the Real World

When you check your mobile data usage, you might see that you have used 78 MB of data. Or, if you are buying groceries, the total bill might come to 78 rupees. Even the number of players in a kabaddi team's squad might be around 78 for a big tournament.

Key Vocabulary

Key Terms

NATURAL NUMBER: A whole number greater than 0, used for counting. | TWO-DIGIT NUMBER: A number made up of two digits. | 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 78, you can learn about other numbers and how to perform basic operations like addition and subtraction with them. This will help you count bigger things and solve everyday math problems!