What is The Number 79?

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Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

The number 79 is a whole number that comes after 78 and before 80. It is a two-digit number, meaning it has a 'tens' place and a 'ones' place.

Simple Example

Quick Example

Imagine you are playing a game of Ludo and you need to move your token 79 steps to reach home. You would count 78, then one more step makes it 79. Or, if your friend scored 79 runs in a cricket match, that's almost a century!

Worked Example

Step-by-Step

Let's understand 79 using tens and ones:
Step 1: The number 79 has two digits: 7 and 9.
---Step 2: The digit on the left, 7, is in the 'tens' place. This means it represents 7 groups of ten.
---Step 3: So, 7 tens is equal to 7 x 10 = 70.
---Step 4: The digit on the right, 9, is in the 'ones' place. This means it represents 9 single units.
---Step 5: So, 9 ones is equal to 9 x 1 = 9.
---Step 6: To find the total value, we add the value from the tens place and the ones place: 70 + 9 = 79.
---Answer: The number 79 is made up of 7 tens and 9 ones.

Why It Matters

Understanding numbers like 79 is fundamental to all of mathematics, from simple counting to complex calculations. It's crucial for everyday tasks like managing your pocket money, checking bus numbers, or understanding scores in games. Knowing numbers helps you think logically and solve problems, skills useful in careers like engineering, finance, or even running a small business (dukan).

Common Mistakes

MISTAKE: Reading 79 as 'seventy-nine' but writing it as '709'. | CORRECTION: Remember that 'seventy-nine' means 7 tens and 9 ones, so the 9 goes in the ones place, not as a separate digit after 70.

MISTAKE: Confusing the tens and ones place, for example, thinking 79 is 9 tens and 7 ones. | CORRECTION: The digit on the left is always the tens place, and the digit on the right is the ones place.

MISTAKE: Not understanding that 79 is one more than 78 and one less than 80. | CORRECTION: Numbers follow a sequence. Each number is exactly one more than the number before it.

Practice Questions

Try It Yourself

QUESTION: How many tens are there in the number 79? | ANSWER: 7 tens

QUESTION: If you have 79 rupees and your friend gives you 1 more rupee, how many rupees do you have now? | ANSWER: 80 rupees

QUESTION: Write the number that comes just before 79 and the number that comes just after 79. | ANSWER: Before: 78, After: 80

MCQ

Quick Quiz

Which of these statements about the number 79 is true?

It is a single-digit number.

It is made of 7 ones and 9 tens.

It comes after 80.

It is equal to 70 + 9.

The Correct Answer Is:

The number 79 is a two-digit number, so A is wrong. It is made of 7 tens and 9 ones, so B is wrong. It comes before 80, so C is wrong. 70 + 9 correctly represents 7 tens and 9 ones, which is 79.

Real World Connection

In the Real World

You see the number 79 in many places in India! It could be the price of a small packet of biscuits (₹79), the number on a bus route you take, or even the house number of your relative. When you check your mobile phone bill, you might see data usage in MB, for example, 79 MB used.

Key Vocabulary

Key Terms

WHOLE NUMBER: A number without fractions or decimals (like 0, 1, 2, 3...). | DIGIT: A single symbol used to write numbers (like 0, 1, 2...9). | TENS PLACE: The position of a digit representing groups of ten. | ONES PLACE: The position of a digit representing single units.

What's Next

What to Learn Next

Now that you understand 79, you can learn about other two-digit numbers and how to compare them. You can also explore adding and subtracting numbers up to 100, which builds directly on knowing place value.